α_2板条在TiAl合金全层状组织形变和断裂中的作用  

Effect of α_2 plates on deformation and fracture of fully lamellar TiAl alloys

作　　者：陆永浩[1] 张永刚[2] 乔利杰[1] 王燕斌[1] 陈昌麒[2] 褚武扬[1] 

机构地区：[1]北京科技大学材料物理系,北京100083 [2]北京航空航天大学材料科学与工程系,北京100083

出　　处：《中国有色金属学报》2001年第1期1-5,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金!资助项目 (5 9895 15 3)

摘　　要：通过单轴压缩及TEM原位拉伸研究了全层状TiAl合金 (PST晶体 )中α2 板条的形变和断裂特征。结果表明 ,全层状TiAl合金中α2 相形变和断裂特征与加载方向有关。当片层与加载轴平行时 ,α2 相中的滑移沿柱面进行 ,微裂纹优先在α2 相内 (沿柱面 )形核 ;而当片层与加载轴垂直时 ,形变困难 ,α2 相中的滑移将沿角锥面进行 ,微裂纹很容易沿相界面形核、扩展。The deformation and fracture characteristics of α 2 plates in fully lamellar TiAl alloys (PST crystals) were investigated through uniaxial compression and in situ TEM technique. The results indicate that the deformation and fracture characteristics of α 2 plates in fully lamellar TiAl alloys are related to the loading direction. When the lamellae are parallel to the loading axis, the slips in α 2 plates occur along prism planes and microcracks form preferentially within α 2 plates (along prism planes); when the lamellae are perpendicular to the loading axis, the deformation is relatively difficult, and the slips in α 2 plates occur along pyramidal planes and microcracks form easily and propagate along γ / α 2 interfaces. [

关 键 词：TIAL合金 α2板条 形变 断裂 全层状组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]