Directional microstructure of hypereutectic Nb-Si alloy consists of eutectic and halo microstructures (primary silicides and Nbss shell). Microstructure of the hypereutectic Al-high Si alloys prepared by casting. The microstructure and mechanical properties of rapidly solidified Al-18 wt% Si and Al-18 wt% Si-5 wt% Fe alloys were investigated by a combination of optical microscopy, scanning electron microscopy, transmission electron microscopy, x-ray diffraction, tensile testing, and wear testing. 维普期中文期刊服务平台，由维普资讯有限公司出品，通过对国内出版发行的14000余种科技期刊、5600万篇期刊全文进行内容分析和引文分析，为专业用户提供一站式文献服务：全文保障，文献引证关系，文献计量分析；并以期刊产品为主线、其它衍生产品或服务做补充，方便专业用户、机构用户在 . A hypereutectic Al-Fe-Cu alloy with a high-volume fraction ferro-aluminum second phase (AlFe phases for short) was reheated in the solid-liquid region and the microstructure evolution was . 1 (b) and Fig. 2 In the late 1950s, there was a steadily increasing interest in the new ductile irons and laboratory results . This change closely related to the deviation of Nb + Nb5Si3 pseudo-eutectic area during non-equilibrium The serial sectioning technique was applied for determining the three-dimensional (3D) microstructure of an Al-18wt . The investigated materials were prepared using the gravity casting method. This paper presented characterization of the microstructure and tensile properties for two Al-Ce-Mg alloys produced via additive manufacturing. One alloy was near-eutectic (Al-11Ce-7Mg) and the other hypereutectic (Al-15Ce-9Mg) with respect to the L → Al + Al 11 Ce 3 reaction. CHUMBLEY, I.E. The micrograph below shows a hypereutectic cast iron with 5.5 % carbon. In principle, the microstructure and phase fractions are determined by applying the lever rule. Face 1 Face 2 B A D20 30mm LSD I I I I I I I I t I V Fig 2 Sectioning of the from COMPUTER N 111,112,11 at Gulzar Group Of Institute The effect of the added Al-3B and the modification temperature on the microstructure, tensile fracture morphologies, and mechanical properties of the alloy were investigated using an optical microscope, Image-Pro Plus 6.0, a scanning electron microscope, and a universal testing machine. The average diameter of Nbss + Nb5Si3 eutectic cells in DS1.2 was 330.7 ± 23.5 lm, while in DS06 and DS18 samples, it changed to 235.8 ± 12.7 lm and 25.0 ± 1.2 lm respectively. Abstract: The effect of squeeze casting on microstructure and mechanical properties of hypereutectic Al-xSi alloys (x = 15, 17.5, 22 wt%) was investigated in this study.Results show that microstructure of the hypereutectic Al-xSi alloys was obviously improved by squeeze casting. discussed. An hypereutectic Al-18Si alloy was modified via an Al-3B master alloy. (a) Al-50Si alloy, (b) Al-50Si-.5P alloy. 2 (b). Directional solidification experiments were carried out on the hypereutectic Ni-25 at.% Al alloy to examine the effect of growth velocity on the eutectic microstructure. 2288-2294. Introduction Materials with an excellent wear resistance combined with a relatively high impact toughness have been widely used in the mining and cement industries under medium- and high-impact conditions for a long time. The presence of coarse primary silicon has a harmful effect on the extrudability, machinability, strength, and ductility of the alloy, hence its mechanical properties are worse. Determination of the microstructure fractions and phase fractions. cite this article in press as: Li P, et al. Micros … Microstructure was analyzed by optical microscopy, field-emission scanning electron microscopy and Vickers microhardness tests. The typical hypoeutectic microstructure (primary phase + eutectic) is also observed in I-8.33 alloy, as displayed in Figs. 6. (a) Al-50Si alloy, (b) Al-50Si-.5P alloy. A hypereutectic Al-Fe-Cu alloy with a high-volume fraction ferro-aluminum second phase (AlFe phases for short) was reheated in the solid-liquid region and the microstructure evolution was . Here, as the labelling suggests, beta starts to solidify at any favourable Abstract. However, the optimal microstructure and hence the optimal service performance of these alloys cannot be achieved by the conventional melt treatments used in industry today, because of the chemical incompatibility between the primary-Si refiners and the . A hypereutectic Al-Fe-Cu alloy with a high-volume fraction ferro-aluminum second phase (AlFe phases for short) was reheated in the solid-liquid region and the microstructure evolution was investigated. And there are two growth modes of halo microstructures. Mg was added as a solid solution strengthening element. OSTI.GOV Journal Article: The influence of cooling rate on the microstructure of an Al-Ni hypereutectic alloy In this paper, the microstructure and mechanical properties of two magnesium matrix composites-a hypoeutectic with 1.9 wt% Mg 2 Si phase and a hypereutectic with 19 wt% Mg 2 Si compound-were analyzed. The optical micrographs from the conventionally solidified hypereutectic Al-16 wt.% Si alloy ingot is shown in Fig. Characterization of Hypereutectic Al-Si Powders Solidified under Far-From Equilibrium Conditions Y.E. Its microstructure consists of blocky faceted primary-Si (dark gray) and long eutectic-Si plates embedded in α-Al matrix. Microstructures of rapidly solidified hypereutectic Al-Mn alloys Sun and Loper, after studying the microstructure of hypereutectic flake iron, cannot find any tendency to flotation of the primary graphite. In the following, the microstructure and phase fractions at room temperature for an . microstructure of hypereutectic Al-Si alloys is composed of primary silicon particles (PSPs) and eutectic structure of α ‐ Al and Si. 3D microstructure of hypereutectic Al-Si alloy revealed by phase contrast tomography (ZEISS Xradia 520 Versa) An international collaboration To address this material design challenge, researchers at Naval Materials Research Laboratory (NMRL) in India used a novel approach of friction stir processing (FSP), a variant of severe plastic . Microstructure and wear characteristics of hypereutectic Fe-Cr-C cladding with various carbon contents Chia-Ming Changa, Li-Hsien Chena, Chi-Ming Lina, Jie-Hao Chena, Chih-Ming Fanb, Weite Wua,⁎ a Department of Materials Science and Engineering, National Chung Hsing University, 250 Kuo-Kuang Rd., Taichung, Taiwan b Kuang Tai Metal Industrial Co., Ltd.,8 Lu-Ke Third Rd., Lujhu Township . Hypereutectic and eutectic AlSi-base alloys find frequent application in casting automotive components. For the hypereu- tectic composition investigated, hypereutectic microstructure would gradually convert into eutectics with the increase of withdrawal rate. %) on the microstructure evolution and tensile properties of as-cast hypereutectic Al-10Si-.8Fe alloy was investigated. Intermetallics期刊最新论文，,顶级期刊最新论文图文内容，出版社网站每日同步更新，点击标题直达论文原文，自定义关注的期刊，覆盖PubMed的论文库，快速方便精准的找到您想要的论文 Microstructure and Mechanical Properties of Spray Formed and Hot-Pressed Hypereutectic Al-Si Alloy Alawandi MR, Khaji SS and Dayanand M Goudar* Department of Mechanical Engineering, India Abstract The microstructure and mechanical properties of spray formed and hot-pressed Al-35Si alloy was studied and compared with as cast alloy. 定向凝固的Al 2 O 3 / Er 2 O 3 / ZrO 2用高频感应区熔化制备陶瓷。研究了它们的相组成，微观结构和生长特性。结果表明，通过生坯的粉碎和二次球磨，可以得到氧化物分布均匀的原料粉末，有利于获得细化，均匀的共晶组织。每个样品的相成分与根据其组成在相图中的位置得出的预测一致。 Mechanical behavior and microstructure of hypereutectic high chromium cast iron: the combined effects of tungsten, manganese and molybdenum additions. Microscopy and Microanalysis, 2016. The centrifugally atomized binary alloy powder consisted of the α-Al (slightly supersaturated with . The properties of this type of alloy depend significantly on their solidification microstructure, especially the size, shape, and distribution of primary and eutectic silicon. Effect of chilling and cerium addition on microstructure and cooling curve parameters of Al-14%Si alloy By vijeesh v Effect of P and Sr additions on the microstructure of hypereutectic Al-15Si-14Mg-4Cu alloy 6. 12, pp. Microstructure evolution of a hypereutectic Nb-Ti-Si-Cr-Al-Hf alloy processed by directional solidification 441 increase of withdraw rate, Nb5Si*3 disappeared in DS06 and DS18 samples. 1c. . In the present study, the microstructure of Mg-5Si alloys with tin, aluminum and manganese was investigated. Hypereutectic Al-Si alloys with fine and evenly distributed Si precipitates have superior mechanical properties In this study, hypereutectic Al-Si alloy powders which contained 15 and 20wt% Si were prepared by a gas atomization process. To observe the AlP phase, the refined alloy was processed with alcohol. OSTI.GOV Conference: Microstructures of rapidly solidified hypereutectic Al-Mn alloys. 3D Investigation of the Microstructure Evolution in Hypereutectic Aluminum Silicon Alloy using High Resolution Phase Contrast X-Ray Microscopy. They are used in applications that typically require a combination of light weight and high wear resistance, such as . The main objective of this study is to investigate the microstructure and tensile strength of /Al alloy composites fabricated by die casting method. The effect of electric current pulse on the microstructure and corrosion resistance of hypereutectic high chromium cast iron was explored. During semisolid heating, the high-melting AlFe phases in the Al-Fe-Cu alloy were demonstrated to … The present work studied the effects of different modification treatments on the microstructure and mechanical properties of hypereutectic high chromium cast iron containing about 35 wt% chromium and 4.0 wt% carbon. The mixture is slow cooled, undergoing no change in state until it reaches temperature T1, when it reaches the liquidus line. The cooled hypereutectic cast iron microstructure thus consists at room temperature of the primarily precipitated cementite strips which bed in the eutectic of ledeburit-II. Supplement Ⅳ: "Dynamic Precipitation Behavior of Secondary M 7 C 3 52(2012), No. The microstructures of hypereutectic Nb62Ti16Ni22 alloy after subjecting as-cast and homogenizing treatment were investigated in detail by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM), respectively. OSTI.GOV Conference: Microstructures of rapidly solidified hypereutectic Al-Mn alloys. The microstructure of the hypereutectic Fe-Cr-C alloy is observed by optical microscopy (OM). The formation of the intermetallic phase along the alloys, as well as the size, distribution and microstructure were observed as a function of cooling speed, showing different particle . The high strength and wear 1, 3 and 5wt% AlN particles were blended with the Al-Si alloy powders using turbular mixer. The microstructure of hypereutetic AlSi17 specimens prior and after the ultrasonic treatment is shown in Fig. The microstructure, room temperature compressive property, and elevated temperature tensile property of directionally solidified NiAl-Cr(Mo)-(Hf,Dy) hypereutectic alloy were investigated. Microstructure of hypereutectic Al-15Si alloys without addition Ce contained dendritic structure of α-Al, eutectic structure of Al-Si and primary Si. Hypereutectic Al-Si alloys are recognized as attractive candidate materials for automobile engine application such as piston, clutch housing and brake drum due to good wear and corrosion resistance, good thermal conductivity, high strength to weight ratio and low thermal expansion coefficient [1-6].It is well known that the microstructure of hypereutectic Al-Si alloys consists of primary . The phases and their morphologies in these alloys were identified by XRD and SEM equipped with EDX with the help of metallographic analysis techniques; the length of the secondary phase (LSP) and . Generally the cast microstructure of the hypereutectic Al-Si alloy consists of coarse and segregated primary silicon crystals along with the needle like eutectic silicon. The microstructures of alloys treated the microstructures of hypereutectic Al-23%Si alloy using by this new ultrasonic treatment system were more uni- this equipment was investigated, and the mechanisms of form, and the segregation of the chemical composition was ultrasonic treatment for improving the microstructures were avoided. Optimizing the Pouring Temperature for Semisolid Casting of a Hypereutectic Al-Si Alloy Using the Cooling Slope Plate Method - عرض المنشور . The hypereutectic Al-Si alloys can be employed as Alloy2 to form a non-dendritic microstructure for hypoeutectic Al-Si alloys. Microstructures of rapidly solidified hypereutectic Al-Mn alloys The matrix microstructure of the as-welded alloy is . The Mg2Sn phase and α-Mg solid solution with tin appear in the . The microstructure of Mg-5Si alloy consists of the primary coarse Mg2Si phase, α-Mg solid solution and eutectic α-Mg + Mg2Si in which the eutectic Mg2Si phase solidifies in the form of Chinese script particles. Microstructure Eutectic cementite Wear Hypereutectic high chromium cast iron Tungsten Manganese and molybdenum additions 1. In this paper, the effect of Er addition (0.2, 0.5, 0.65, 0.8, 1.0, and 1.5 wt. ANDERSON, and R.E. Microstructure of in situ Mg 2 Si reinforced hypereutectic Al-18%Si matrix composites after different heat treatments (a) 535 °C × 4 h solution treatment, 170 ± 2 °C × 8 h aging treatment (b) 545 °C × 4 h solution treatment, 170 ± 2 °C × 8 h aging treatment (c) 535 °C × 6 h solution treatment, 170 ± 2 °C × 8 h aging treatment (d . The directional solidifications of liquid metal cooling technique (LMC) and zone melted liquid metal cooling technique (ZMLMC) were adopted. 1 (b-d). Full size image To observe the AlP phase, the refined alloy was processed with alcohol. Transcribed image text: A hyper-eutectoid Fe-C alloy has 29.5 % proeutectoid cementite just above 727°C. 2 In the late 1940s, it was demonstrated that ductile cast iron could be made by adding Mg to the liquid metal. The mixture was consolidated by Hot Press at 550°C for 1h under 60MPa. Microstructure and mechanical properties of Al-alloyed ductile iron upon casting and austempering Taylor and Francis Ltd. عرض المنشور. The eutectic ledeburit-II (finely patterned) and the primarily precipitated cementite needles, which . Growth mode Ⅰ: simultaneous solidification of Nbss shell and eutectic which leads to different crystal orientations; Growth mode Ⅱ: eutectic is . To refine and spheroidize the microstructures of hypereutectic Al-Si-Fe alloys, a novel method of wavelike sloping plate (WSP) rheocasting was proposed, and the effect of the WSP rheocasting on the microstructures of hypereutectic Al-18 pct Si-5 pct Fe alloys was investigated. 3 Grey cast iron is a very brittle material, and for centuries, cast irons could only be made ductile through days of heat treatment of the so called 'malleable irons'. A hypereutectic Al-Si alloy powder was manufactured by ultrasonic gas atomization process. If the alloy is cooled just below 727 °C, its microstructure will be: Composition (at% C) 5 10 15 20 25 1600 1538°C 1493°C L 1400 2500 1394°C Y+L 1200 1147°C 2.14 4.30 Y, Austenite 2000 Temperature (°C) 1000 Temperature (°F) 912°C 7 + Fezc 800 1500 727°C 0.76 600 0.022 a, Ferrite . The addition of Ce in the Al-15Si alloys refined the Si primary phase as the Ce content increases as shown in Fig. Microstructure analyses of the fabricated composites were carried out by XRD and light microscopy. BACKGROUND AND PURPOSE: Hypereutectic aluminum-silicon (Al-Si) alloys are widely used in the aerospace and automobile industries because of their low density, excellent wear and corrosion resistance, low coefficient of thermal expansion, good strength, and excellent castability. The typical hypoeutectic microstructure (primary phase + eutectic) indicates that the I-7.5 alloy is a typical hypoeutectic high entropy alloy (hypo-EHEA). An hypereutectic Al-18Si alloy was modified via an Al-3B master alloy. The hypereutectic Al-Si alloys can be employed as Alloy2 to form a non-dendritic microstructure for hypoeutectic Al-Si alloys. The effect of heat treatment temperature on the microstructure and mechanical properties of a Fe-4.0C-18.0Cr-1.0Mo-1.0Ti (wt.%) hypereutectic high chromium white cast iron was investigated. Gourav Rao. "Effect of Heat Treatment on Microstructure and Mechanical Properties of Ti-alloyed Hypereutectic High Chromium Cast Iron" Qiang Liu, Peter Hedström, Hongwei Zhang, Qiang Wang, Pär G. Jönsson and Keiji Nakajima ISIJ International, Vol. The investigated materials were prepared using the gravity casting method. The morphologies, microstructure and phase constituent of the alloy powder were studied. This Paper. A short summary of this paper. 3. alloy would be called hypo-eutectic, as it would be to the left of the eutectic point. Download Download PDF. Hypereutectic Cu98Cr2 alloys were prepared by vacuum arc melting and electromagnetic levitationing method. In this paper, the microstructure and mechanical properties of two magnesium matrix composites—a hypoeutectic with 1.9 wt% Mg2Si phase and a hypereutectic with 19 wt% Mg2Si compound—were analyzed. KALAY, L.S. Microstructure of the hypereutectic Al-high Si alloys prepared by casting. The hypereutectic Al-Si alloys constitute an important family of alloys because of their excellent wear resistance and low thermal expansion. Full PDF Package Download Full PDF Package. The morphology of carbides in solidification microstructure was observed by an optical microscope and a scanning electron microscope and the composition was determined by an electron probe micro-analyzer. It is shown that for the arc melted hypereutectic Cu98Cr2 alloy, the general microstructures consist of primary β(Cr) grains distributes on α(Cu) matrix and (α+β) eutectics set in cellular α (Cu) phase. The effect of the added Al-3B and the modification temperature on the microstructure, tensile fracture morphologies, and mechanical properties of the alloy were investigated using an optical microscope, Image-Pro Plus 6.0, a scanning electron microscope, and a universal testing machine. On the contrary, close to the interface between the hardfacing alloy and the substrate, a 300 μm layer characterized by an eutectic structure was detected. The growth velocity was varied from 1 to 20 µm/s at a constant temperature gradient of 10.0 K/mm. Microstructure and mechanical properties of NiAl-based hypereutectic alloy obtained by liquid metal cooling and zone melted liquid metal cooling directional solidification techniques - Volume 31 Issue 5 Cu Sn alloys with a hyper-eutectic composition (97.53 at% Sn, 2.42 at% Cu and 0.05 at% impurities) were melted in a Bridgman-type furnace and cooled at different velocities ranging from free fall to 13 µm/s. The initial growth morphology, the crystallographic structure, the semi-molten morphology and the . The Nb62Ti16Ni22 alloy was prepared by vacuum arc melting, and then homogenized at 950 °C for 8 h. The results show that bcc-Nb, fcc-Ni, B2-NiTi, TiNb . They deduct the solidification mechanism shown in fig.4. But the cooling rate of hypereutectic . The microstructures and orientations of Al‐40%Cu hypereutectic alloy prepared in a 0.45 mm high‐purity alumina crucible at different directional solidification rates (5, 10 and 100 μm/s) were . Where using the hypereutectic Al-Si alloys increases the mass ratio and changes the solidification pathway of Alloy2 leading to reduce the dendrites forming during the solidification of the mixture. Hypereutectic Al-Si Alloy with Completely Nodular Eutectic Silicon: Microstructure and Process Ruyao Wang, Weihua Lu Institute of Materials Science and Engineering, Donghua University, Shanghai, China Email address: ryaowang@yahoo.com (Ruyao Wang) To cite this article: Ruyao Wang, Weihua Lu. The lever arms must always be pulled to the corresponding microstructural or phase boundaries. The results reveal that the morphologies of the primary Si crystal, the Al18Si10Fe5, and the Al8Si2Fe phases can be . Where using the hypereutectic Al-Si alloys increases the mass ratio and changes the solidification pathway of Alloy2 leading to reduce the dendrites forming during the solidification of the mixture. NAPOLITANO The rapid solidification microstructure of gas-atomized Al-Si powders of 15, 18, 25, and 50 wt pct Si were examined using scanning electron microscopy (SEM) and transmission electron . They are used in applications that typically require a combination of light weight and high wear resistance, such as liner-less engine . Figur 4 Schematic representation of the solidification sequence of hyper-eutectic gray iron, according to (43). The middle and the top parts of the coating alloy show an evident hypereutectic microstructure close to that observed in the original alloy (see Figure 2). The microstructure evolution was investigated during the solidification process. Hypereutectic aluminum-silicon (Al-Si) alloys are widely used in the aerospace and automobile industries because of their low density, excellent wear and corrosion resistance, low coefficient of thermal expansion, good strength, and excellent castability. It is clear from this figure that the primary Si crystals have faceted morphologies prior to the ultrasonic treatment. P1: PSG/RNT P2: SNH 698-97 November 26, 1998 11:47 JOURNAL OF MATERIALS SCIENCE 33 (1998) 5015 - 5023 Refinement of cast microstructure of hypereutectic Al-Si alloys through the addition of rare earth metals JOONYEON CHANG, INGE MOON Division of Metals, Korea Institute of Science & Technology, Seoul 136-791, Korea CHONGSOOL CHOI Department of Metallurgical Engineering, Yonsei . An analysis was made of microstructure of hypereutectic Al-2.0 wt.% Fe alloy treated by laser surface remelting (LSR), microhardness test, and electrochemical behavior test and their numerical simulation was done. The results show that the microstructure of the hypereutectic Fe-Cr-C hardfacing alloy consists of the primary carbide and eutectic structure.
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