摘要
双相TiAl基合金塑性变形的微观机制分析表明 ,由于γ相仅通过普通位错的滑移和形变孪生不能任意改变形状 ,所以不能满足多晶体TiAl基合金晶粒间产生协调变形的必要条件。根据上述分析推导出多晶体TiAl基合金室温下断裂应变εf和晶粒直径d的关系为 :εf =a/(d +b) +c。
Analysis on the deformation micro mechanism shows that the γ phase in two phase TiAl base alloys can not undergo a general change of shape only by ordinary dislocation slip and deformation twining In this case, the requirement of deformation continuity in grain boundaries of γ phase can not be satisfied Based on the analyses above the relationship between the fracture strain ε f and grain size d is derived as ε f= a/(d+b)+c, which fit the experimental results of previous researchers very well
出处
《有色金属》
CAS
CSCD
2000年第4期80-82,共3页
Nonferrous Metals
