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11期2178-2186,共9页

摘　　要： 采用加入与母合金液具有相同成分的自孕育剂方法,研究孕育剂参数(孕育剂加入方式、孕育剂尺寸、孕育剂加入量和孕育剂组织)对AM60镁合金组织细化的影响。结果表明:加入自孕育剂后,熔体经导流器浇注到铸型中,可以明显细化AM60镁合金的组织。当孕育剂加入量为11%(质量分数)时,效果最好,平均晶粒尺寸仅为43.4μm,且分布均匀。孕育剂的原始组织对合金凝固组织有明显的影响,孕育剂本身的组织越细小,合金凝固组织越细小。孕育剂的加入使合金液中形成大的能量起伏和成分起伏,在合金凝固过程中起到吸热、形核、促进凝固和阻止二次相连续长大的作用,有助于形成细晶组织。 The self-inoculant with the same composition as the melt of alloy was introduced into the melt.The effects of the inoculant parameters,such as addition method,particle size,addition amount and precursor microstructure,on grain refinement were investigated.The results indicate that the grain size of AM60 alloy is refined when the self-inoculant is introduced into the melt,and then the melt passes through a special cooling channel.A average grain size of 43.4 μm is gained when the addition amount of inoculants is up to 11%（mass fraction）.The precursor microstructure of self-inoculants affects final solidification microstructure visibly of AM60 alloy.The smaller the microstructure of self-inoculant is,the better the final solidification microstructure is.The inoculant increases the thermal and constitutional fluctuation,and plays a role of heat absorption,nucleation,acceleration solidification during solidification of AM60 alloy,which is helpful for the formation of grain refining microstructure.

关 键 词： 镁合金 孕育剂 自孕育法 组织细化 半固态

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]