Refinement and consolidation of pure Al particles by equal channel angular pressing and torsion  

纯铝颗粒等径角挤扭中的细化和固结(英文)

作　　者：李萍[1] 薛克敏[1] 王晓溪[1] 钱陈豪[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第5期1289-1294,共6页中国有色金属学报（英文版）

基　　金：Project(50875072)supported by the National Natural Science Foundation of China;Project(121053)supported by Fok Ying Tong Education Foundation;Project(20100111110003)supported by Specialized Research Fund for the Doctoral Program of Higher Education,China

摘　　要：Consolidation of pure Alpowder was conducted at 200 ℃ by equal channel angular pressing and torsion （ECAPT） method. The grain refinement and consolidation behavior were deeply investigated by scan electronic microscopy （SEM） and transmission electronic microscopy （TEM）. The density, hardness and room temperature compression properties of the deformed samples were measured. The experiment results show that ECAPT is an effective method of consolidating powders at relatively low temperatures. Pure A1 particles are successfully consolidated into dense bulk material after 4 passes of ECAPT at 200 ℃. The consolidated material possesses fine grain structure and excellent mechanical properties. The refinement and consolidation mechanisms were analyzed. ECAPT is a promising method to produce the high-performance bulk materials from particles.采用等径角挤扭新工艺(ECAPT)在200°C条件下实现纯铝粉末颗粒的固结。采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)深入研究粉末细化和固结行为,并对变形后试样的密度、硬度和室温压缩性能等进行测试。结果表明:等径角挤扭工艺是实现在相对较低的温度下粉末固结的有效方法。在200°C下经4道次变形后,成功将纯Al颗粒固结为致密的块体材料,固结后的材料具有较细的晶粒结构和良好的力学性能。深入分析了晶粒细化和固结机理。等径角挤扭工艺是具有良好前景的以粉末为原材料制备高性能块体材料的工艺。

关 键 词：REFINEMENT CONSOLIDATION equal channel angular pressing and torsion Al powder 

分 类 号：TG379[金属学及工艺—金属压力加工] TF124[冶金工程—粉末冶金]