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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]
Copyright of Journal of Materials Engineering & Performance is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Microstructural Evolution and Strengthening Mechanisms in a Mg-Gd-Y-Zn-Zr Alloy via Multi-stage Thermomechanical Processing.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Engineering+%26+Performance%22">Journal of Materials Engineering & Performance</searchLink>. May2026, Vol. 35 Issue 20, p20393-20403. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Thermomechanical+treatment%22">Thermomechanical treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+density%22">Dislocation density</searchLink><br /><searchLink fieldCode="DE" term="%22Strengthening+mechanisms+in+solids%22">Strengthening mechanisms in solids</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium+alloys%22">Magnesium alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Tensile+strength%22">Tensile strength</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+grain+boundaries%22">Crystal grain boundaries</searchLink>
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  Data: 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]
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  Data: <i>Copyright of Journal of Materials Engineering & Performance is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11665-025-13076-3
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        Type: general
      – SubjectFull: Dislocation density
        Type: general
      – SubjectFull: Strengthening mechanisms in solids
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      – SubjectFull: Microstructure
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      – SubjectFull: Tensile strength
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      – SubjectFull: Crystal grain boundaries
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      – TitleFull: Microstructural Evolution and Strengthening Mechanisms in a Mg-Gd-Y-Zn-Zr Alloy via Multi-stage Thermomechanical Processing.
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              Text: May2026
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