作　　者： ; ;

机构地区： 中南工业大学

出　　处： 《中南工业大学学报》 1998年第6期559-562,共4页

摘　　要： 研究了超塑性Ｔｉ－３３Ａｌ－３Ｃｒ－０．５Ｍｏ（质量分数，％）合金中孔洞的形成和发展过程及其与合金的断裂之间的关系．研究结果表明，ＴｉＡｌ基合金在超塑性变形过程中产生的孔洞有３种类型，它们分别形成于三叉晶界处、晶界上和晶粒内．三叉晶界上的孔洞一般呈Ｖ型，而晶界和晶内的孔洞则呈圆形或椭圆形．分析认为，孔洞的长大、扩展和聚集是造成ＴｉＡｌ基合金超塑性拉伸断裂的主要原因． Porosity of Ti 33Al 3Cr 0.5Mo(mass fraction,%) alloy after superplastic deformation was investigated.The experiments showed that the pore nucleation occured not only at triple points,but also at grain boundaries,and even within γ grains.Most of the pores at the triple points were present in V shape,and those in grain boundaries and within grains appeared as spherical.It was believed that coarsening and coalescence of the pores were the main reasons of the superplastic fracture of TiAl based alloy.

关 键 词： 孔洞 超塑性变形 基合金 合金

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [金属学及工艺] [一般工业技术] [金属学及工艺]