硅在等温锻造TiAl合金中的分布及其对合金超塑性的影响  

Distribution and Effect of Si on Superplasticity of Isothermally Forged TiAl Alloy

作　　者：张建民[1] 李世琼[1] 邹敦叙[1] 仲增墉[1] 

机构地区：[1]冶金部钢铁研究总院

出　　处：《钢铁研究学报》1997年第5期29-32,共4页Journal of Iron and Steel Research

基　　金：863计划及国家自然科学基金

摘　　要：通过在９００～１２００℃的温度区间，以５．５×１０－４ｓ－１的初始应变速率拉伸等温锻造后的ＴｉＡｌ－ＣｒＳｉ合金，研究ＴｉＡｌ合金的超塑性及硅元素的作用。研究发现，等温锻造的ＴｉＡｌ－ＣｒＳｉ合金在很宽的温度区间都表现出较好的超塑性；合金的断裂与孔洞的形成和连接有很大关系；Ｓｉ在ＴｉＡｌ合金中以形成新相的形式存在，并对孔洞的形成和连接起阻碍作用。The effect of silicon and the superplasticity of TiAl were studied based on the tensile experiments of isothermally forged TiAl CrSi alloy at 5.5×10 -4 s -1 initial strain rate in the range of 900 ℃ to 1 200 ℃. It was found that TiAl CrSi alloy exhibited good superplasticity in a very wide temperature range and the fracture of tensioned specimens had a close relationship with the formation and joining of cavities. Silicon existed in TiAl alloy by forming a new aluminide which would resist the formation and joining of cavities.

关 键 词：TIAL合金 硅 超塑性 孔洞 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG132.32[金属学及工艺—金属材料]