“Branched” structural transformation of the L12-Al3Zr phase manipulated by Cu substitution/segregation in the Al-Cu-Zr alloy system

Ding, Lipeng; Zhao, Mingqi; Ehlers, Flemming J.H.; Jia, Zhihong; Zhang, Zezhong; Weng, Yaoyao; Schryvers, Dominique; Liu, Qing; Idrissi, Hosni

doi:10.1016/j.jmst.2023.11.015

“Branched” structural transformation of the L12-Al3Zr phase manipulated by Cu substitution/segregation in the Al-Cu-Zr alloy system

Ding, Lipeng

;

Zhao, Mingqi

;

Ehlers, Flemming J.H.

;

Jia, Zhihong

;

Idrissi, Hosni

;et.al.

(2024) Journal of Materials Science & Technology : an international journal in the field of materials science — Vol. 185, p. 186-206 (2024)

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Authors

Ding, LipengNanjing Tech University, China
Author
Zhao, MingqiChongqing University of Posts and Telecommunications, China
Author
Ehlers, Flemming J.H.Nanjing Tech University, China
Author
Jia, ZhihongNanjing Tech University, China
Author
Idrissi, HosniUCLouvain
Author

Abstract

The effect of Cu on the evolution of the Al3 Zr phase in an Al-Cu-Zr cast alloy during solution treatment at 500 °C has been thoroughly studied by combining atomic resolution high-angle annular dark-field scanning transmission electron microscopy, energy-dispersive X-ray spectroscopy and first-principles cal- culations. The heat treatment initially produces a pure L12 -Al3 Zr microstructure, allowing for about 13 % Cu to be incorporated in the dispersoid. Cu incorporation increases the energy barrier for anti-phase boundary (APB) activation, thus stabilizing the L12 structure. Additional heating leads to a Cu-induced “branched”path for the L12 structural transformation, with the latter process accelerated once the first APB has been created. Cu atoms may either (i) be repelled by the APBs, promoting the transformation to a Cu-poor D023 phase, or (ii) they may segregate at one Al-Zr layer adjacent to the APB, promoting a transformation to a new thermodynamically favored phase, Al4 CuZr, formed when these segregation layers are periodically arranged. Theoretical studies suggest that the branching of the L12 transformation path is linked to the speed at which an APB is created, with Cu attraction triggered by a comparatively slow process. This unexpected transformation behavior of the L12 -Al3 Zr phase opens a new path to un- derstanding, and potentially regulating the Al3 Zr dispersoid evolution for high temperature applications.

Affiliations

UCLouvainSST/IMMC/IMAP - Materials and process engineering
Nanjing Tech UniversityKey laboratory for Light-weight Materials
Chongqing University of Posts and TelecommunicationsSchool of Automation
University of AntwerpElectron Microscopy for Materials Science (EMAT)
University of OxfordDepartment of Materials
Nanjing Institute of TechnologySchool of Materials Science and Engineering

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Ding, L., Zhao, M., Ehlers, F. J. H., Jia, Z., Zhang, Z., Weng, Y., Schryvers, D., Liu, Q., & Idrissi, H. (2024). “Branched” structural transformation of the L12-Al3Zr phase manipulated by Cu substitution/segregation in the Al-Cu-Zr alloy system. Journal of Materials Science & Technology : an international journal in the field of materials science, 185, 186-206. https://doi.org/10.1016/j.jmst.2023.11.015 (Original work published 2024)