全层片组织TiAl 基合金室温断裂机理的研究

来源期刊：中南大学学报(自然科学版)1997年第2期

论文作者：刘文胜 黄伯云 贺跃辉 陈小群 曲选辉

文章页码：53 - 56

关键词：TiAl基合金； 断裂韧性； 断裂机理； 全层片组织

Key words：TiAl based alloy； fracture toughness； fracture mechanisms； fully-lamellar composition

摘    要：在SEM和TEM下对Ti33Al3Cr0.5Mo合金全层片组织薄板状和薄膜状试样分别进行了动态拉伸，并原位观察了试样中裂纹的形核及扩展过程．发现裂纹遇到内相界面时会发生偏转或裂尖发生钝化；主裂纹主要以使剪切带断裂而与微裂纹相连接的方式扩展并沿曲折路径进行．

Abstract: The in-situ tensile of a fully-lamellar TiAl alloy, with a composition of Ti33Al3Cr0.5 Mo(mass fraction %), was performed with plate and foil specimens in SEM and TEM respectively. The process of initiation and extension of crack was in-situ observed. The results revealed that the crack would deflect and its tip would blunt when it met the interface; the extension of the main crack was performed by the shear ligments fracture to connect with microcrack; the extension of crack had the tortuous path.