浇注温度对自孕育铸造法制备AM60镁合金半固态浆料的影响(Ⅰ)  

Effect of pouring temperature on AM60 Mg alloy semi-solid slurry prepared by self-inoculation method (Ⅰ)

作　　者：李元东[1,2] 杨建[1] 马颖[1,2] 曲俊峰[1] 张鹏[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《中国有色金属学报》2010年第6期1046-1052,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究计划资助项目(2007CB613700);甘肃省国际科技合作计划资助项目(090WCGA894);兰州理工大学博士科研启动基金资助项目(SB01200701)

摘　　要：采用新型的自孕育法制备AM60镁合金半固态浆料,研究浇注温度对自孕育法制备AM60镁合金半固态浆料的影响。结果表明:随着浇注温度的降低,组织中发达和粗大的树枝晶逐渐减少;在接近液相线温度时出现小块状或蔷薇状晶粒,晶粒的尺寸逐渐减小;分布逐渐趋向正态分布,且存在一个合适的温度加工区间,即630～680℃,对应的晶粒尺寸为58.4～63.1μm。加入的孕育剂在熔体中起到内冷铁作用,加快熔体的冷却速率,使熔体快速到达半固态区间。采用自孕育法制浆时,合金熔体中晶核主要来源于熔体中的高熔点质点(Al8Mn5)、孕育形核和晶粒游离与增殖。The semi-solid slurry of AM60 Mg alloy was prepared by a novel self-inoculation method（SIM） .The effect of pouring temperature on the semi-solid slurry prepared by self-inoculation method was investigated.The results show that the coarser dendrite reduces with the decrease of pouring temperature.A small block or rosette grain is obtained when the pouring temperature is near-liquidus.Meanwhile,the grain size also decreases,and it becomes approximately normally distributed.An ideal temperature process interval/window has to be required between 630℃and 680℃,and the grain size is 58.4-63.1μm correspondingly.The added inoculants are as internal chill in AM60 melt,which accelerates the cooling rate of the melt,as a result,the melt is cooled down to semi-solid range rapidly.The nuclei are from high melting point phases in the melt（such as Al8Mn5） ,inoculants,and the grain of the free and the proliferation.

关 键 词：镁合金 AM60镁合金 半固态浆料 自孕育法 浇注温度 凝固过程 

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