Al-W合金粉末冷热压制坯工艺与坯块热变形行为研究  

Cold and hot pressing technology of Al-W alloy powder and hot deformation behavior of billets

作　　者：郭拉凤[1,2] 张治民[1] 薛勇[1] 李保成[1] 

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]中北大学机电工程学院,山西太原030051

出　　处：《轻合金加工技术》2015年第1期49-53,共5页Light Alloy Fabrication Technology

基　　金：国家973研究专项(2012CB626808);山西省自然科学基金(2013011022-4);山西省研究生优秀创新项目(20133098)

摘　　要：试验研究Al、W粉末按比例混合,冷压、热压制成Al-W粉末合金坯块的工艺,确定冷压、热压工艺参数,压制坯块的致密度达到99.5%以上。采用Gleeble-1500热模拟试验机,对Al-W合金粉末压制坯块在变形温度420℃~570℃、应变速率0.001 s^-1~5 s^-1、最大变形程度为60%的条件下进行热压缩试验。分析变形温度和应变速率对Al-W粉末合金坯块高温塑性变形应力的影响,确定不同变形温度、不同变形速率下的峰值应力,计算Al-W粉末合金的变形激活能,为制定Al-W粉末合金塑性成形工艺提供理论依据。A cold and hot pressing technology was studied to make Al-W powder alloy bil- lets with proportional Al and W powders. The process parameters were determined, and densi- ty of the pressed billets reached over 99.5%. The hot compression test of A1-W powder alloy was performed with the Gleeble-1500 thermal modeling tester at the strain rate of 0. 001 s^-1 -5 s^-1 ,the deformation temperature of 420℃ -570℃ ,and the deformation degree not ex- ceeding 60%. The effects of the deformation temperature and the strain rate on the plastic de- formation stress of Al-W power alloy at high temperature were analyzed, the peak stresses un- der the different deformation temperatures and different strain rates were defined, and the ac- tivation energy was also calculated. It provides a theoretical basis for the development of plas- tic forming process of Al-W powder alloy.

关 键 词：Al-W粉末合金 压制 变形温度 应变速率 激活能 

分 类 号：TF124.3[冶金工程—粉末冶金]