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sensitivity of solid fraction decreases with increasing solid fraction or with decreasing temperature above eutectic reaction temperature of AM60 alloy. When the solid fraction φs is 0.4, corresponding... temperature range (ΔT). It is usually defined as the temperature range between the solidus and the liquidus of an alloy. The solidification temperature range of pure metal and eutectic alloys is zero......
that the terna-ry Al-Si-Mg2Si eutectic reaction is depressed when Fig.2 DTA curves of Al-7%Si-0.55%Mg alloy at various cooling rates Table 4 DSC cooling characteristics of as-cast Al-7%Si-0.55%Mg... a two-dimensional visualization of a section of the complex Al-Si-Mg ternary system[15]. The eutectic temperature of an Al-Si alloy for a given Mg content can roughly be estimated by following......
, and finally eutectic reaction. The eutectic reaction is carried out with the way of divorced growth model so that a halo of Mg17Al12 forms around the primary phase particle. Key words: magnesium alloy... alloy 图8 AZ91D镁合金触变成形离异共晶组织形貌的SEM像 Fig.8 Divorced eutectic micrographs of thixoformed AZ91D alloy 晶独立生长的结果.尽管AZ91D合金中Al含量小于其极限固溶度(12.7%),但在触变成形的非平衡凝固条件下,已经凝固的固相的平均成分将偏离平衡固相线.合金液凝固时,初生的α......
investigated in thixocasting[12]. The effect of chemical eutectic modification by strontium or sodium in aluminium alloy castings is well known. It has also been claimed that mechanical stirring... that the Al-Si eutectic formed will be coarse. Therefore, sodium (Na) was used as a modifying agent to reduce the coarseness of the eutectic. Tensile test bars were machined from three different sets......
viscosity of three different types of Al-Si alloy melts was measured. It was showed that the relationship between the viscosity and temperature of hypoeutectic Al-5% Si and eutectic Al12.5%Si alloy melts...TEMPERATURE DEPENDENCE OF VISCOSITY OF Al-Si ALLOY MELTS Z.X.Yang1,J.H.Chen2,R.Wang1,H.R.Geng1,Y.Wang1,C.J.Sun2 (1.School of Materials Science and Engineering, Jinan University, Jinan 250022, China......
the microstructure of ZZn4-1 alloy considerably. In the case of samples collected from pressure die-casting, the addition of cerium in appropriate amount can refine the primary η-phase and the eutectic...Effect of Cerium on Mechanical Properties and Morphology of ZZn4-1 Alloy LI Ping1,LI Ya-guo2,LIU Hai-lin2,ZHU Yi-qing2,XUE Tao2 (1.Guiyang Steel Mill, Guiyang 550002, China;2.Guizhou Research......
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电弧熔炼态Laves相Cr2Nb/Cr合金的微观组织演变李克伟1,李双明1,傅恒志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:采用真空非自耗电弧熔炼法制备了Cr-12%Nb(原子分数,下同)和Cr-20%Nb 2种成分合金的纽扣锭,利用XRD,OM,SEM和EDS对电弧熔炼态纽扣锭不同位置的组织及其竞争生长进行了研究.结果表明:Cr-12%Nb合金纽扣锭底部为细小的离异共晶,中部和顶部则由粗大的初生Cr相和共晶组织(Cr2Nb+Cr)组成.而Cr-20%Nb纽扣锭底部出现的是胞状层片共晶组织......
Preparation of Mg-Yb alloy film by electrolysis in the molten LiCl-KCl-YbCl_3 system at low temperature ZHANG Milin1,CHEN Ye1,YE Ke1 (1.Key Laboratory of Superlight Materials & Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China) Key words:LiCl-KCl eutectic; molten salt; Mg-Yb alloy films......
Modification Effects of Lanthanum-Rich Mischmetal on A357 Alloy 李华基1,刘昌明1,薛寒松1,李革胜1 (1.College of Mechanical Engineering, Chongqing University,) Abstract:A357 alloy was modified with lanthanum... metal. It is shown that the modification effect of La-rich mischmetal is better than that of strontium in the aspects of refining eutectic silicon, ejecting hydrogen from the melt and improving......
