Phase-field study for effect of chemical composition on pre-precipitation process of γ′ phase in Ni-Al-Ti alloy

作     者：孙远洋 赵宇宏 侯华 郑晓娟 郭慧俊 SUN Yuan-yang;ZHAO Yu-hong;HOU Hua;ZHENG Xiao-juan;GUO Hui-jun

作者机构：中北大学材料科学与工程学院山西太原030051 

出 版 物：《Journal of Measurement Science and Instrumentation》 (测试科学与仪器（英文版）)

年 卷 期：2017年第8卷第2期

页      面：178-184页

核心收录：

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：National Natural Science Foundation of China(Nos.U1610123,51674226,51574207,51574206,51274175) International Cooperation Project of the Ministry of Science and Technology of China(No.2014DFA50320) Science and Technology Major Project of Shanxi Province(No.MC2016-06) 

主　　题：chemical composition L10 phase microscopic phase field model volume fraction 

摘      要：The pre-precipitation processes of γ＇ phase in Ni-Al-Ti alloy with different chemical compositions are investigated by microscopic phase-field dynamics model. The simulation results show that the early precipitated phase with L10 structure is formed before the formation of γ＇ phase. With the increase of Al content, the composition of precipitated phase is transformed from the co-existence of γ＇ phase and material phase into single y phase. Furthermore, excessive Al content can stimulate the production of γ＇ phase, and the conversion time from L10 phase to L12 phase will lag behind other samples with lower Al con-tent. By analyzing the occupation probability of Ti, it can be found that the solid solution strengthening effect of Ti is reduced with the increase of Al component.