Effect of heat treatment on microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy

Effect of heat treatment on microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy

This paper examined the effects of heat treatment on the microstructure evolution and mechanical properties of the Mg-8Gd-3Y-1.5Zn-0.6Zr (VWZ832K) alloy. After solution treatment, it was discovered that the alloy's LPSO phase had altered from 18R-LPSO to 14H-LPSO. The transformation of the LPSO...

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Bibliographic Details
Main Authors: Xiaoya Chen, Dongzhen Wang, Quanan Li, Yi Xiong, Kaikai Tian, Peijun Chen
Format: Article
Language:English
Published: Elsevier 2025-03-01
Series:Journal of Materials Research and Technology
Subjects:
VWZ832K alloy
LPSO phase
Microstructure evolution
Heat treatment
Mechanical properties
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785425004089
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Summary:This paper examined the effects of heat treatment on the microstructure evolution and mechanical properties of the Mg-8Gd-3Y-1.5Zn-0.6Zr (VWZ832K) alloy. After solution treatment, it was discovered that the alloy's LPSO phase had altered from 18R-LPSO to 14H-LPSO. The transformation of the LPSO phase was accompanied by rearrangement of atoms, where atoms in the 18R-LPSO phase underwent diffusion and reorganization, and stacking faults experienced movement. Adjacent layer faults slid upward by one atomic layer and were replaced by another set of layer faults, thereby theoretically forming the 14H-LPSO phase. The aged VWZ832K alloy's β′ phase had a shuttle-shaped structure, and this shape of the precipitate phase was more effective than granular and rod-shaped precipitates in obstructing basal slip. As the LPSO phase formed and grew, it consumed a portion of the Gd and Y elements in the α-Mg matrix.And the more LPSO phase present, the greater the consumption of rare earth elements, which also resulted in fewer β′ phases, limiting the impact of precipitation strengthening. Additionally, the LPSO phase could obstruct the dislocations movement, causing dislocations to accumulate near the LPSO phase, hindering their motion and significantly enhancing the mechanical properties.
ISSN:2238-7854

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