Ni-Ti形状记忆合金侵彻变形与断裂研究  

Deformation and Fracture of Ni-Ti Shape Memory Alloys under the Penetration of Projectiles

作　　者：张晓[1] 杨素媛[1] 

机构地区：[1]北京理工大学冲击环境材料技术国家级重点实验室,北京100081

出　　处：《稀有金属材料与工程》2016年第5期1235-1239,共5页Rare Metal Materials and Engineering

摘　　要：研究了Ni-Ti形状记忆合金在高速冲击条件下的侵彻过程。利用光学显微镜对Ni-Ti形状记忆合金在高速冲击后的微观组织进行考察,分析Ni-Ti合金板材的损伤和断裂。结果表明:奥氏体相为基的Ni-Ti形状记忆合金板材,在高速冲击过程中,发生应力诱发马氏体相变;板材内形成剪切带、微裂纹等形式的损伤,导致材料发生变形和破坏;裂纹按着微孔洞聚集型机制扩展。Damage and fracture of Ni-Ti plate during high velocity impact was investigated. The deformation microstructures were studied by optical microscope. The results indicate that stress induced martensitic（SIM） phase transformation occurs in Ni-Ti plate matrix for Austenite phase in the process of penetration. Deformation and fracture of Ni-Ti plate appear due to shearing band and micro-crack nucleated in interface. Fracture mechanisms are micropore nucleation, growth and coalescence.

关 键 词：微观损伤 应力诱发马氏体 剪切带 

分 类 号：TG139.6[一般工业技术—材料科学与工程]