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Microstructural Evolution and Strengthening Mechanisms in a Mg-Gd-Y-Zn-Zr Alloy via Multi-stage Thermomechanical Processing.

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Title: Microstructural Evolution and Strengthening Mechanisms in a Mg-Gd-Y-Zn-Zr Alloy via Multi-stage Thermomechanical Processing.
Authors: Wang, Jinjun1 (AUTHOR), Khan, Muhammad Abubaker1 (AUTHOR), Wang, Han1 (AUTHOR), Huang, Zhexuan1 (AUTHOR), Afifi, Mohamed A.2,3 (AUTHOR), Li, Jingyuan1 (AUTHOR) lijy@ustb.edu.cn
Source: Journal of Materials Engineering & Performance. May2026, Vol. 35 Issue 20, p20393-20403. 11p.
Subjects: Thermomechanical treatment, Dislocation density, Strengthening mechanisms in solids, Microstructure, Transmission electron microscopy, Magnesium alloys, Tensile strength, Crystal grain boundaries
Abstract: Achieving exceptional strength in lightweight Mg-RE alloys remains a critical challenge, requiring processing routes specifically designed to generate and stabilize high-density dislocation networks. In this context, this work examined the impact of multi-stage thermomechanical processing on the microstructure, mechanical properties, and dislocation density of the Mg-Gd-Y-Zn-Zr (GWZ821) alloy. An exceptional ultimate tensile strength of ~ 408 MPa was achieved in a GWZ821 alloy through a multi-stage process involving double extrusion, hot rolling, and aging. This processing route produced a refined bimodal microstructure with an average grain size of ~ 2 μm. The strengthening mechanism is a synergistic combination of grain-boundary pinning and intense dislocation hardening. Crucially, detailed TEM analysis revealed that the high dislocation density is dominated by basal slip systems. This establishes a direct link between the specific thermomechanical path and the activation of potent strengthening mechanisms, offering a clear strategy for engineering advanced, high-performance magnesium alloys. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Achieving exceptional strength in lightweight Mg-RE alloys remains a critical challenge, requiring processing routes specifically designed to generate and stabilize high-density dislocation networks. In this context, this work examined the impact of multi-stage thermomechanical processing on the microstructure, mechanical properties, and dislocation density of the Mg-Gd-Y-Zn-Zr (GWZ821) alloy. An exceptional ultimate tensile strength of ~ 408 MPa was achieved in a GWZ821 alloy through a multi-stage process involving double extrusion, hot rolling, and aging. This processing route produced a refined bimodal microstructure with an average grain size of ~ 2 μm. The strengthening mechanism is a synergistic combination of grain-boundary pinning and intense dislocation hardening. Crucially, detailed TEM analysis revealed that the high dislocation density is dominated by basal <a> slip systems. This establishes a direct link between the specific thermomechanical path and the activation of potent strengthening mechanisms, offering a clear strategy for engineering advanced, high-performance magnesium alloys. [ABSTRACT FROM AUTHOR]
ISSN:10599495
DOI:10.1007/s11665-025-13076-3