Phase-field simulation of re-dissolution of γ'phase in Ni-Al alloy by continuous and second-order aging treatment

• 作者: Kun-Wu Lai Shu-Jing Shi Zheng-Wei Yan Yong-Sheng Li Sheng-Shun Jin Dong Wang Shahid Maqbool
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1155-1163
• 页数: 9页
• 语种: 英文

摘要

The morphology and kinetics evolution of the γ'(Ni3Al)phase during re-dissolution are studied in Ni-15 at％Al alloy,the changes of volume fraction and average particle radius of the γ'phase were clarified with phase-field simulation.During isothermal aging,the interdistance of the neighboring γ'phase affects the interface concen-tration gradient of Al,which dominates the growth or re-dissolution of the γ'phase particle.After 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 stage.The pre-dissolution 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 K.Dif-ferent from continuous heating,in the second-order aging process,the connected particles with band shape are broken initially by re-dissolving.At 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.