摘要
对预制裂纹型损伤的愈合过程进行了实时原位观察 ,结果发现裂纹愈合过程分为裂尖钝化、裂纹分节、裂腔球化、孔洞愈合及质量均匀化等几个明显阶段。所得结果与金相法得到的纯铁的裂纹愈合过程相符 ,通过建立相关裂纹愈合模型分析认为裂纹愈合过程必须满足一定的热动力学条件 。
In this paper full process of crack healing is in situ observed for the first time.It is found that there are several obvious stages in the process of crack healing,including crack tip blunting,crack disintegration, crack sphericizing to void,void healing and well distributing.Thermodynamic conditions of damage healing are analyzed and it is proved that the void diffusing is a main mechanism during the crack healing process,which is in accord with the crack healing process of pure iron by metallographic examination.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2001年第3期37-41,共5页
Aerospace Materials & Technology
