Enhancing strength at elevated temperatures via dynamic high-density mobile dislocations in Mg alloys

Mingyu Fan; Ye Cui; Xin Zhou; Junming Chen; Yang Zhang; Lixin Sun; Jamieson Brechtl; Daqing Fang; Qian Li; Qingqing Ding; Hongbin Bei; Peter K. Liaw; Yanzhuo Xue; Xun Li Wang; Yang Lu; Zhongwu Zhang

doi:10.1016/j.jma.2025.03.004

Enhancing strength at elevated temperatures via dynamic high-density mobile dislocations in Mg alloys

Mingyu Fan, Ye Cui, Xin Zhou, Junming Chen, Yang Zhang, Lixin Sun, Jamieson Brechtl, Daqing Fang, Qian Li, Qingqing Ding, Hongbin Bei, Peter K. Liaw, Yanzhuo Xue, Xun Li Wang, Yang Lu, Zhongwu Zhang

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Abstract

Dislocation strengthening, as one of the methods to simultaneously enhance the room temperature strength and ductility of alloys, does not achieve the desired strengthening and plasticity effect during elevated-temperature deformation. Here, we report a novel strategy to boost the dislocation multiplication and accumulation during deformation at elevated temperatures through dynamic strain aging (DSA). With the introduction of the rare-earth element Ho in Mg-Y-Zn alloy, Ho atoms diffuse toward dislocations during deformation at elevated temperatures, provoking the DSA effect, which increases the dislocation density significantly via the interactions of mobile dislocations and Ho atoms. The resulting alloy achieves a great enhancement of dislocation hardening and obtains the dual benefits of high strength and good ductility simultaneously at high homologous temperatures. The present work provides an effective strategy to enhancing the strength and ductility for elevated-temperature materials.

Original language	English
Journal	Journal of Magnesium and Alloys
DOIs	https://doi.org/10.1016/j.jma.2025.03.004
State	Accepted/In press - 2025

Funding

The present work was supported by the National Key Research and Development Project (2023YFA1609100), the NSFC Funding (U2141207, 52171111, 52001083) and Natural Science Foundation of Heilongjiang (YQ2023E026), China Postdoctoral Science foundation (2024M754149), Postdoctoral Fellowship Program of CPSF (GZC20242192). YL thanks Hong Kong RGC general research fund (#11200623) and HKU Seed Fund for Collaborative Research (#2207101618). PKL thanks the support from the National Science Foundation (DMR-1611180 and 1809640) with the program directors, Drs. J. Madison, J. Yang, G. Shiflet and D. Farkas. XLW acknowledges the support by Croucher Senior Research Fellowship and CityU Project (Project No. 9229019), Shenzhen Science and Technology Program (Project No. JCYJ20220818101203007).

Keywords

Dynamic strain aging (DSA)
Elevated-temperature strength
High-density mobile dislocations
Ho addition
Mg-Y-Zn alloy

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10.1016/j.jma.2025.03.004

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title = "Enhancing strength at elevated temperatures via dynamic high-density mobile dislocations in Mg alloys",

abstract = "Dislocation strengthening, as one of the methods to simultaneously enhance the room temperature strength and ductility of alloys, does not achieve the desired strengthening and plasticity effect during elevated-temperature deformation. Here, we report a novel strategy to boost the dislocation multiplication and accumulation during deformation at elevated temperatures through dynamic strain aging (DSA). With the introduction of the rare-earth element Ho in Mg-Y-Zn alloy, Ho atoms diffuse toward dislocations during deformation at elevated temperatures, provoking the DSA effect, which increases the dislocation density significantly via the interactions of mobile dislocations and Ho atoms. The resulting alloy achieves a great enhancement of dislocation hardening and obtains the dual benefits of high strength and good ductility simultaneously at high homologous temperatures. The present work provides an effective strategy to enhancing the strength and ductility for elevated-temperature materials.",

keywords = "Dynamic strain aging (DSA), Elevated-temperature strength, High-density mobile dislocations, Ho addition, Mg-Y-Zn alloy",

author = "Mingyu Fan and Ye Cui and Xin Zhou and Junming Chen and Yang Zhang and Lixin Sun and Jamieson Brechtl and Daqing Fang and Qian Li and Qingqing Ding and Hongbin Bei and Liaw, {Peter K.} and Yanzhuo Xue and Wang, {Xun Li} and Yang Lu and Zhongwu Zhang",

note = "Publisher Copyright: {\textcopyright} 2025",

year = "2025",

doi = "10.1016/j.jma.2025.03.004",

language = "English",

journal = "Journal of Magnesium and Alloys",

issn = "2213-9567",

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T1 - Enhancing strength at elevated temperatures via dynamic high-density mobile dislocations in Mg alloys

AU - Fan, Mingyu

AU - Cui, Ye

AU - Zhou, Xin

AU - Chen, Junming

AU - Zhang, Yang

AU - Sun, Lixin

AU - Brechtl, Jamieson

AU - Fang, Daqing

AU - Li, Qian

AU - Ding, Qingqing

AU - Bei, Hongbin

AU - Liaw, Peter K.

AU - Xue, Yanzhuo

AU - Wang, Xun Li

AU - Lu, Yang

AU - Zhang, Zhongwu

PY - 2025

Y1 - 2025

N2 - Dislocation strengthening, as one of the methods to simultaneously enhance the room temperature strength and ductility of alloys, does not achieve the desired strengthening and plasticity effect during elevated-temperature deformation. Here, we report a novel strategy to boost the dislocation multiplication and accumulation during deformation at elevated temperatures through dynamic strain aging (DSA). With the introduction of the rare-earth element Ho in Mg-Y-Zn alloy, Ho atoms diffuse toward dislocations during deformation at elevated temperatures, provoking the DSA effect, which increases the dislocation density significantly via the interactions of mobile dislocations and Ho atoms. The resulting alloy achieves a great enhancement of dislocation hardening and obtains the dual benefits of high strength and good ductility simultaneously at high homologous temperatures. The present work provides an effective strategy to enhancing the strength and ductility for elevated-temperature materials.

AB - Dislocation strengthening, as one of the methods to simultaneously enhance the room temperature strength and ductility of alloys, does not achieve the desired strengthening and plasticity effect during elevated-temperature deformation. Here, we report a novel strategy to boost the dislocation multiplication and accumulation during deformation at elevated temperatures through dynamic strain aging (DSA). With the introduction of the rare-earth element Ho in Mg-Y-Zn alloy, Ho atoms diffuse toward dislocations during deformation at elevated temperatures, provoking the DSA effect, which increases the dislocation density significantly via the interactions of mobile dislocations and Ho atoms. The resulting alloy achieves a great enhancement of dislocation hardening and obtains the dual benefits of high strength and good ductility simultaneously at high homologous temperatures. The present work provides an effective strategy to enhancing the strength and ductility for elevated-temperature materials.

KW - Dynamic strain aging (DSA)

KW - Elevated-temperature strength

KW - High-density mobile dislocations

KW - Ho addition

KW - Mg-Y-Zn alloy

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U2 - 10.1016/j.jma.2025.03.004

DO - 10.1016/j.jma.2025.03.004

M3 - Article

AN - SCOPUS:105001579341

SN - 2213-9567

JO - Journal of Magnesium and Alloys

JF - Journal of Magnesium and Alloys

ER -

Enhancing strength at elevated temperatures via dynamic high-density mobile dislocations in Mg alloys

Abstract

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Keywords

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