采用热焓平衡旋转磁场装置制备半固态浆料  

Semisolid slurry produced using enthalpy equilibrium rotating magnetic fields device

作　　者：张小立[1,2] 李廷举[3] 谢水生[4] 

机构地区：[1]江苏科技大学金属液态成形实验室,苏州215600 [2]江苏科技大学材料科学与工程学院,镇江212003 [3]大连理工大学材料科学与工程学院铸造工程中心,大连116024 [4]北京有色金属研究总院,北京100088

出　　处：《中国有色金属学报》2011年第8期1881-1886,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50374014);江苏省高校博士基金资助项目(35060815)

摘　　要：在旋转磁场驱动金属液高速运动过程中,应用循环冷却水和金属液进行热交换控制金属液的热焓平衡生产A356铝合金半固态浆料,然后分别进行金属型和砂型浇铸,并对浆料在冷却过程中每隔5 min淬火取样浆料的平均冷却速度约为3℃/min。结果表明:热焓平衡旋转磁场装置作用下的金属液温度降至液固两相区内,瞬间产生大量均匀分布在金属液内的初生相α(Al)晶核,采用该方法制备的半固态浆料浇铸的铸件的微观组织呈现等轴球晶形貌,610℃时淬火试样的初生相晶粒平均直径为29μm,同时在缓慢冷却程中初生相α(Al)晶粒趋向于圆整并粗化。The semisolid slurry of A356 aluminum alloy was prepared using an enthalpy equilibrium rotating magnetic fields device,in which the heat of molten alloy was exchanged using circulating cooling water when the alloy melt was rotating speedily,in order to control the enthalpy equilibrium process of alloy melt.Then the semisolid slurry was respectively poured into the sand mold and metal mold,furthermore,the quenched samples were prepared every 5 min during cooling with cooling rate of 3 ℃/min.The results indicate that the circumstance in the bulk liquid metal would burst into copious nucleation of primary α（Al） near liquidus temperature,and at the same time these primary nucleus distribute uniformly in the alloy melt.The microstructure of castings exhibits equiaxed characteristic morphology,the average diameter of primary α（Al） is 29 μm when quenched at 610 ℃.Meanwhile,the primary α（Al） particles trend to coarsen and spheroidize during slow cooling.

关 键 词：半固态浆料 微观组织 热焓平衡 旋转磁场 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG249[金属学及工艺—金属材料]