作　　者： ; ; ; ; ;

机构地区： 兰州理工大学材料科学与工程学院甘肃省有色金属新材料省部共建国家重点实验室

出　　处： 《中国有色金属学报》 2010年第6期1046-1052,共7页

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 镁合金 半固态浆料 自孕育法 浇注温度 凝固过程

领　　域： [金属学及工艺] [金属学及工艺] [一般工业技术] [金属学及工艺]