TC21钛合金片层组织裂纹萌生和扩展的原位研究  

In-situ study of crack initiation and propagation of lamellar microstructure in TC21 titanium alloy

作　　者：单迪[1] 何鑫玉 王睿[1] 方长青[1] 

机构地区：[1]西安理工大学,陕西西安710048

出　　处：《兵器材料科学与工程》2015年第6期20-22,共3页Ordnance Material Science and Engineering

基　　金：西安理工大学博士启动金(104-211310);2014年校青年创新团队(104-211403)

摘　　要：为研究片层组织的TC21钛合金在损伤下的失效行为,通过原位拉伸装置对具有圆形缺口的TC21合金进行变形行为研究,并获得合金原位拉伸时载荷-位移曲线及不同位移处的显微组织形貌。结果表明,在0.001 mm/s的拉伸速率下,与拉伸方向呈约45°方向的缺口位置产生滑移带,微观裂纹沿与滑移方向平行的晶界或晶内条状α相界面萌生并扩展。In order to study the fracture behavior of the lamellar microstructure in TC21 titanium alloy,the deformation behavior of TC21 titanium alloy with a circular gap was investigated by an in-situ tensile device. The load-displacement curve and a series of in-situ fracture morphologies were obtained. The results show that the slip band is formed at an included angle of appropriately45° to the tensile direction and at a tensile rate of 0.001 mm/s. The micro-cracks initiate and propagate along the grain boundary parallel to the shear band direction or within the alpha lamellae.

关 键 词：TC21合金 片层组织 滑移带 裂纹萌生 裂纹扩展 

分 类 号：TG146.4[一般工业技术—材料科学与工程]