Core-shell structure nanoprecipitates in Fe-xCu-3.0Mn-1.5Ni-1.5Al alloys: A phase field study

• Published in: Progress in natural science Vol. 32; no. 3; pp. 358 - 368
• Main Authors: Zhao, Yuhong, Sun, Yuanyang, Hou, Hua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2022; School of Materials Science and Engineering North University of China,Taiyuan,030051,China; Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing,100083,China%School of Materials Science and Engineering North University of China,Taiyuan,030051,China%College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,030024,China
• Subjects: Core-shell structure; Elastic strain; Fe–Cu–Mn–Ni–Al; Phase-field; Phase-field; Fe–Cu–Mn–Ni–Al; Core-shell structure; Elastic strain; Fe-Cu-Mn-Ni-Al
• ISSN: 1002-0071
• DOI: 10.1016/j.pnsc.2022.04.001

The core-shell structure precipitatates of Fe-xCu-3.0Mn-1.5Ni-1.5Al alloys under internal and external strain was investigated by using a multicomponent continuous phase field model based on Gibbs free energy of sub regular solution. Results show that the early cluster nuclei are not pure Cu, and Mn/Ni/Al also gather in the same position of Cu rich nuclei, resulting in four core-shell structures in precipitation. In the absence of external strain, the morphology of precipitates is mainly determined by interfacial energy, intrinsic elastic anisotropy and lattice distortion between new phase and parent phase. Intrinsic elastic strain energy can inhibit precipitation, while has no obvious effect on particle morphology. In coarsening, the elastic energy decreases due to the combination of particles. The loading direction and magnitude of the applied elastic strain field can control the morphology of precipitates. The external strain and the interaction between Mn, Ni and Al promote the joining and merging of adjacent core-shell particles. This work has guiding significance for the design of Fe-xCu-3.0Mn-1.5Ni-1.5Al alloys and other core-shell precipitates materials. [Display omitted] •Precipitation of core-shell particles in Fe-Cu-Mn-Ni-Al alloys under internal and external elastic strain was investigated by a multicomponent phase field model.•The intrinsic elastic strain energy inhibits precipitation of core-shell particles in Fe-Cu-Mn-Ni-Al alloy.•In coarsening, the applied elastic strain field controls the morphology of precipitates, promotes the joining and merging of adjacent core-shell particles.