Work

Direct Observation of Matrix‐to‐Precipitate Elemental Diffusion in Severe Plastic Deformation

Year: 2026

Type: article

Abstract: ABSTRACT Elemental redistribution, particularly the solute exchange between the matrix and precipitates, is a central issue in alloys subjected to severe plastic deformation (SPD). To elucidate this behavior, a nickel–aluminum bronze (NAB) alloy was processed by high‐pressure torsion (HPT), and its microstructural evolution was systematically investigated using multiscale characterization techniques. A dynamic competition between precipitate dissolution and reprecipitation was identified during SPD. More notably, direct evidence was provided for the diffusion of the matrix element Cu into κ precipitates under heavy deformation, leading to the formation of high‐density Cu‐rich AlCu 3 nanoparticles embedded within the κ precipitate. This unusual elemental redistribution was shown to be thermodynamically favorable under the nonequilibrium conditions induced by SPD. By extending a classical size concentration model based on Fick's second law to a multicomponent alloy system, the coupled growth behavior of AlCu 3 nanoparticles and the κ precipitate is successfully rationalized. These results provide new insight into elemental diffusion pathways and microstructural evolution in complex alloys subjected to SPD.

Source: Rare Metals

DOI: 10.1002/rar2.70255

Authors: Xiaobin Yang, Yu Liao, Yigen Huang, Yue Xing, Kaixuan Chen, Shuo Ma, Liming Fu, Jingtao Wang, Mao Wen, Aidang Shan

Institutions: Shanghai Jiao Tong University, Chinese Academy of Sciences, Nanjing University of Science and Technology, Shanghai Institute of Microsystem and Information Technology, University of Science and Technology Beijing

Language: English

Topic: Microstructure and mechanical properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,190

OpenAlex ID: W7151969596

FWCI:

Cites: 37

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