Phase-field simulation of re-dissolution of γ’phase in Ni-Al alloy by continuous and second-order aging treatment
Phase-field simulation of re-dissolution of γ’ phase in Ni-Al alloy by continuous and second-order aging treatment作者机构：School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyNanjing 210094China
出 版 物：《Rare Metals》 (稀有金属（英文版）)
年 卷 期：2021年第40卷第5期
页 面：1155-1163页
核心收录：
学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 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] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化]
基 金：supported by the National Natural Science Foundation of China(No.51571122) the Fundamental Research Funds for the Central Universities(No 30916015107)
主 题：Ni-based superalloy γ’phase Re-dissolution Kinetics
摘 要：The morphology and kinetics evolution of the γ’(Ni3 Al)phase during re-dissolution are studied in Ni-15 at% Al alloy,the changes of volume fraction and average particle radius of theγ’phase were clarified with phasefield *** isothermal aging,the interdistance of the neighboringγ’phase affects the interface concentration gradient of Al,which dominates the growth or redissolution of the γ’phase *** isothermal aging at 700 K,the alloy is continuously heated to 900 K with different heating rates,the re-dissolution lag happens,meaning the coalescence coarsening of adjacent γ’phase particles still proceeds at the initial heating *** predissolution of γ’phase with cubic shape is re-dissolved firstly at the edges and corners,in continuous heating to 900 K or by second-order aging from 700 to 900 *** from continuous heating,in the second-order aging process,the connected particles with band shape are broken initially by *** different heating rates,the similar dynamic relationships are abstracted for the volume fraction and the heating rates,and the average particle radius and the heating rates.
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