多向热压缩形变处理AM60及半固态重熔组织演变研究  

Investigation of Semi-Solid Microstructure Evolution of AM60 Magnesium Processed by Multi-Axial Hot Compressive Deformation

作　　者：侯莹莹[1] 徐秀丽[1] 王晓伟[1] 纪兴华[2,3] 

机构地区：[1]枣庄科技职业学院,山东滕州277500 [2]山东省粉末冶金先进制造重点实验室,山东莱芜271100 [3]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《铸造》2015年第9期893-896,900,共5页Foundry

基　　金：航天支撑技术基金(2014-HT-HGD12)

摘　　要：采用多向热压缩形变的SIMA法制备了AM60镁合金半固态坯,分析了多向热压缩形变对AM60镁合金微观组织的影响;切取试样在半固态温度重熔后水淬,研究了形变率、加热温度、热压缩形变道次对AM60镁合金半固态重熔组织的影响,分析了多向热压缩形变法获得AM60镁合金球状晶的机制。结果表明:通过多向热压缩形变可以生成具有细密等轴晶组织的AM60镁合金;在相同的条件下,形变率越大、压缩形变道次越多,半固态重熔组织晶粒越细小、均匀,球化程度越高。Abstract： Semi-solid billet of AM60 magnesium was prepared by strain induced melt activation （SIMA） with multi-axial hot compressive deformation. The effect of multi-axial hot compressive deformation on the microstructure of AM60 magnesium was investigated. The cutting samples were water-quenched after semi-solid remelting. The influences of the deformation rate and heating temperature as well as deformation pass on microstructure transformation of AM60 magnesium in semi-solid remelting process was researched. The mechanism of obtaining AM60 magnesium spherical structures was analyzed. The results show that AM60 magnesium prepared by multi-axial hot compressive deformation has a finely dispersed equiaxed grain structure. With an increase in deformation rate and heating temperature, the microstrueture is smaller and more homogeneous.

关 键 词：镁合金 多向热压缩形变 半固态 微观组织 

分 类 号：TG306[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]