变形方式对钼粉致密度及强化机制的影响研究  

Research on Effects of Deformation Methods on Density and Reinforcement Mechanism of Molybdenum Powders

作　　者：宋群超 李萍[1] 王雪[1] 华睿[1] 薛克敏[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《稀有金属与硬质合金》2015年第4期47-50,共4页Rare Metals and Cemented Carbides

基　　金：教育部新世纪优秀人才支持计划(NCET-13-0765);国家自然科学基金(50875072)

摘　　要：将钼粉装入包套内加热到500℃,对其进行两道次A路径等径角挤压和热压实验,对比分析了颗粒形貌、孔隙分布、显微硬度。结果表明:试样经过两道次等径角挤压后,孔隙分布均匀,颗粒变形程度较大,且显微硬度较高;经过热压后的试样,孔隙分布不太均匀,且靠冲头上端的致密度要高于下端,颗粒变形也不大,压制力未使颗粒发生脆性断裂,故其显微硬度小于经两道次等径角挤压试样。The molybdenum powders were put into the tube and heated to 500℃,and then two pass A-route equal channel angular pressing(ECAP)or hot pressing experiments were carried out.Particle morphology,pore distribution and microhardness were compared of the molybdenum powders from different pressing methods.The results show that after two pass ECAP,pore distribution of the sample is more uniform,and both particle deformation degree and microhardness are higher.After hot pressing,pore distribution of the sample is nonuniform,its density at the upper end is higher than that at the down end,and its particle deformation degree is small.During hot pressing,pressing force cannot result in brittle fracture of the particles,so the sample has lower microhardness than the sample processed by equal channel angular pressing.

关 键 词：钼粉 等径角挤压 致密度 孔隙 显微硬度 

分 类 号：TG379[金属学及工艺—金属压力加工]