Precipitate Behavior and Microstructure Evolution of γ′ phase in Ni-Al Alloys with the Internal Elastic Strain
作者单位:Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and Technology
会议名称:《中国材料大会2012》
会议日期:2012年
学科分类:08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)]
基 金:the financial support by National Natural Science Foundation of China(No.51001062) National Basic Research Program of China (No.2011CB 605504) Jiangsu Provincial Natural Science Foundation (No.BK2011710)
关 键 词:Ni-Al alloy Precipitation Microstructure evolution Elastic strain Phase-field
摘 要:The microstructure evolution and precipitation behaviors of ordered γ′(Ni3Al) phase in Ni-Al alloys were studied using the phase field dynamic model. Under the interactions of internal elastic strain, the γ′ phase morphology changes from the separated cuboidal to connected rectangle shape with the decrease of the aging temperature or the increase of the Al concentration. It also shows that the ordering of precipitates is finished instantly when they precipitate from the matrix phase. The γ′ phase volume fraction and the phase transformation velocity are affected by the aging temperature and composition of the Ni-Al alloys.