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it was poured into the metal cup and controlled in the liquid-solid temperature range, and the effects of ultrasonic vibration time, isothermal holding time, rest-work ratio on the semisolid slurry were... refinement result. Key words: Al-Si alloy; ultrasonic vibration; hypereutectic; semisolid slurry; rest-work ratio  ......
Trans. Nonferrous Met. Soc. China 23(2013) 2585-2590 Mechanisms of joint formation throughout semisolid stir welding of AZ91 magnesium alloy V. A. HOSSEINI, H. AASHURI, A. KOKABI Materials Science and Engineering Department, Sharif University of Technology, Azadi Ave., Tehran, Iran Received 7 November 2012; accepted 10 April 2013 Abstract: Joining in the semisolid state is considered a possible......
较低剪切速率下过冷熔体非枝晶组织的形成与演化赵力宁1,林鑫1,黄卫东1(1.陕西省西安市西北工业大学凝固技术国家重点实验室)摘 要:采用SCN-5H2O(摩尔分数,%)透明模型合金研究了较低剪切速率范围内过冷合金熔体中晶体的生长与演化行为.结果表明,在较大过冷度下,存在一个剪切速率阈值,当熔体剪切速率高于阈值,晶体能够以球状形态生长;当剪切速率低于阈值,晶体以枝晶形态生长.在较低剪切速率下,过冷度较大时,球晶失稳后呈枝晶形态,过冷度较小时,球晶失稳后呈玫瑰晶形态.球晶失稳形成玫瑰晶是由球晶界面扰动胞低速生长过程......
and design much lighter and better fatigue resistant metal of semisolid A357 aluminum alloys. This work aims at a better understanding of identifying the fatigue strain-hardening parameters used... of aluminum alloy A357 compared with the same analytical curve for the same alloy. Key words: fatigue; aluminum; semisolid; analytical modeling; qualitative analysis 1 Introduction Fatigue failure......
for fabrication and rheoformation of aluminum and magnesium alloys semisolid slurry TENG Hai-tao1, 2, XIONG Bai-qing1, ZHANG Yong-an1, LI Ting-ju2, ZHANG Xiao-li2, XIE Shui-sheng1 (1. State Key Laboratory... semisolid slurry of A356 aluminum alloy in different pouring temperatures, were introduced. The results show that the microstructures are directly related to the pouring temperature, the lower pouring......
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; 文献标志码:A Refinement mechanism of mixed rare earth on primary α phase in semisolid A356 alloy under electromagnetic stirring LIU Zheng1, XU He-jun2, LUO Hao-lin2, ZHOU Zhi-peng2, CHEN... of Science and Technology, Ganzhou 341000, China) Abstract: In order to obtain the fine, round and uniform distribution primary α phase in semisolid A356 alloy, the different amounts of mixed RE elements......
C. Elaboration of semisolid alloys by means of new electromagnetic rheocasting process[J]. Metal Trans, 1992, 21B(4): 189-193. [7]Kirkwood D H, Kapranos P. Semi-solid processing of alloys[J]. Metals...: A Finite element modelling analysis of metal flowing during process of extending extruding semisolid A2017 alloy GUAN Ren-guo, LI Ying-long, WANG Shun-cheng, LIU Xiang-hua, WEN Jing-lin (Material......
半固态合金强流变轧制单位轧制压力分布的数学模型和理论研究黄红乾1,曹富荣2,管仁国1,赵占勇2,邢振环2(1.辽宁省沈阳市东北大学材料与冶金学院2.东北大学冶金与材料学院,沈阳110004)摘 要:建立了半固态合金强流变轧制过程封闭矩形孔型中单位轧制压力分布的数学模型,并以AZ91D镁合金为例,通过计算研究了轧制带材厚度,带材宽度和轧辊半径对单位轧制压力分布的影响规律.结果表明,强流变轧制带材的厚度越小,宽度越窄,单位轧制压力峰值越大,平均单位轧制压力也越大;随着带材厚度减小,单位轧制压力峰值向出口移动,而随着......
% and HV 55.7 respectively. Key words: 6061 aluminum alloy; semisolid powder thixoforging; mechanical properties; tensile properties; hardness; microstructure 1 Introduction Particle-reinforced...]. In addition, CHEN et al [17] indicated that an ideal semisolid microstructure with small and spheroidal primary particles could be obtained after the 6061 bulk alloy prepared by cold-pressing the atomized......