部分重熔对SiC_p/2024_p冷压块半固态组织演变的影响  

Effects of Partial Remelting on the Microstructure Evolution of SiC_p/2024_p Aluminum Composites Prepared by Alloy Powder Cold Pressing

作　　者：李普博 陈体军[1,2] 张素卿[1] 王英俊[1] 

机构地区：[1]兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室 [2]兰州理工大学有色金属合金及加工教育部重点实验室

出　　处：《特种铸造及有色合金》2015年第3期260-264,共5页Special Casting & Nonferrous Alloys

基　　金：兰州理工大学红柳杰出人才培养计划资助项目(J201103)

摘　　要：研究了SiCp/2024p冷压块在部分重熔过程中的组织演变,并与基体合金进行了对比,探讨了温度对组织的影响。结果表明,冷压块在部分重熔过程中可分为3个阶段:初期晶粒的快速粗化、组织分离与球状化以及后期初生相颗粒的粗化;基体组织的分离快于复合材料,且基体的初生相颗粒尺寸小于复合材料的;重熔温度太高时,半固态浆料品质变差。The microstructure evolution of SiCp/2024 pAl composites prepared by alloy powder cold-pressing during partial remelting was investigated,and it was compared with those of the 2024 pmatrix.Effects of heating temperature on semisolid microstructure were described.The results indicate that the microstructural evolution process can be divided into three stages：the initial rapid coarsening of the fine grains within powders,structural separation and spheroidization,final coarsening of primary particles,respectively.The separation of the microstructure of the 2024 p matrix is faster than that of the composites during partial remelting,moreover,the primary particle size of the matrix microstructure is smaller than that of the composites.However,many advantages of thixoforming can be lost if the temperature is very high.

关 键 词：冷压块 部分重熔 组织演变 

分 类 号：TB333[一般工业技术—材料科学与工程] TG249.26[金属学及工艺—铸造]