Weakening Mechanisms of Platelike σ Phase on Ni-base Superalloys

作     者：刘跃生 赵先国 刘志中 谢锡善 

作者机构：Beijing Institute of Aeronautical Materials100095China.To whom correspondence should be addressed. Beijing Institute of Aeronautical Materials100095China. University of Science and Technology Beijing100083China. 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：1990年第6卷第5期

页      面：319-324页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：Ni-base superalloys σ-phase weakening mechanism 

摘      要：On the basis of an investigation on σ phase in Ni-base cast superalloy K24 and the results about σ phase in other Ni-base superalloys,an embrittl- ing mechanism and a softening mechanism,by which platelike σ phase weakens the Ni-base superalloys,have been *** is considered that the platelike morphology and the habit precipi- tation along{111}of σ phase are necessary condi- tions for both *** embrittling mecha- nism is dominant at room temperature and high strain rate,and the softening mechanism is domi- nant at high temperature and low strain ***- cording to the idea of the softening mechanism and the analyses of σ phase and alloy compositions,it is considered that Nb,Mo and W in the alloys may be resistant to the detrimental effect of σ phase on the stress-rupture properties of the alloys.