固态金属致脆裂纹的萌生与致脆原子输运机制  

Crack Initiation Behavior and Embrittler Transport Mechanism for Embrittlement of Ti6Al4V

作　　者：刘道新[1,2] 刘双梅[1,2] 何家文[1,2] 

机构地区：[1]西安交通大学 [2]西北工业大学

出　　处：《西安交通大学学报》1999年第4期57-60,共4页Journal of Xi'an Jiaotong University

基　　金：航空科学基金

摘　　要：提出了利用锥形试样，以离子束增强沉积（ＩＢＥＤ）银实现银与试样表面接触，并通过慢应变速率拉伸（ＳＳＲＴ）加载，确定Ｔｉ６Ａｌ４Ｖ合金固体银致脆裂纹萌生应力、萌生应变、萌生寿命和裂纹扩展临界应力强度因子的方法．将分形维数的概念应用于描述钛合金低熔点金属致脆断口微观特征，并由此出发分析致脆金属原子的输运机制，从而较好地修正了前人在估算致脆金属原子表面自扩散系数方法上的错误．Few methods can be used to determine the crack initiation behavior in solid metal induced embrittlement (SMIE). The mechanisms of embrittler transport in SMIE have not been clearly understood. A method is developed for determining crack initiation stress, strain, life and cracking threshold intensity factor of solid silver induced embrittlement of Ti6Al4V alloy. Examined are the fractographic characteristics of embrittled Ti6Al4V using fractal geometry. Mistakes made in the open literature for calculating the surface diffusion rate associated with embrittled surface are corrected based on analysis of the fractal feature of diffusion path of the embrittlement agent.

关 键 词：分形维数 裂纹萌生 金属 致脆金属原子 致脆裂纹 

分 类 号：TG111.91[金属学及工艺—物理冶金] TG146.23[金属学及工艺—金属学]