Cryogenic strength-ductility synergy in Mg-6Gd-1Zn alloys with bimodal grain structure coupled with basal lamellar phase

Jing Zuo; Mingquan Zhang; Taiki Nakata; Chao Xu; Xu Zhang; Enyu Guo; Guisong Wang; Kunkun Deng; Kaibo Nie; Xiaojun Wang; Shigeharu Kamado; Lin Geng

doi:10.1080/21663831.2026.2667429

Cryogenic strength-ductility synergy in Mg-6Gd-1Zn alloys with bimodal grain structure coupled with basal lamellar phase

Jing Zuo
, Mingquan Zhang
, Taiki Nakata
, Chao Xu^*
, Xu Zhang
, Enyu Guo
, Guisong Wang
, Kunkun Deng
, Kaibo Nie
, Xiaojun Wang
, Shigeharu Kamado
, Lin Geng

^*Corresponding author for this work

Harbin Institute of Technology
Harbin Institute of Technology
Nagaoka University of Technology
Dalian University of Technology
Taiyuan University of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

Achieving simultaneous strength and ductility at cryogenic temperature (CT) remains challenging for Mg alloys. An extruded Mg-6Gd-1Zn (wt.%) alloy with bimodal grain structure and basal lamellar phases exhibits anomalous strength-ductility synergy at CT. Mechanical incompatibility between soft DRXed and hard unDRXed regions generates geometrically necessary dislocations (GND) accumulation and dominant hetero-deformation-induced (HDI) hardening. Basal lamellar phases intensify elastic and plastic incompatibility, steepening GND gradients and back stress at CT. The coupled bimodal grain structure and basal lamellar phases elevate local resolved shear stress, activating non-basal slip even in grains with low Schmid factors (SF), enabling enhanced cryogenic strength-ductility synergy.

Original language	English
Journal	Materials Research Letters
DOIs	https://doi.org/10.1080/21663831.2026.2667429
State	Accepted/In press - 2026
Externally published	Yes

Keywords

Bimodal grain structure
LPSO phase
cryogenic deformation
hetero-deformation induced hardening

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10.1080/21663831.2026.2667429

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@article{808bd38093534d328f9f2bad1090be0a,

title = "Cryogenic strength-ductility synergy in Mg-6Gd-1Zn alloys with bimodal grain structure coupled with basal lamellar phase",

abstract = "Achieving simultaneous strength and ductility at cryogenic temperature (CT) remains challenging for Mg alloys. An extruded Mg-6Gd-1Zn (wt.\%) alloy with bimodal grain structure and basal lamellar phases exhibits anomalous strength-ductility synergy at CT. Mechanical incompatibility between soft DRXed and hard unDRXed regions generates geometrically necessary dislocations (GND) accumulation and dominant hetero-deformation-induced (HDI) hardening. Basal lamellar phases intensify elastic and plastic incompatibility, steepening GND gradients and back stress at CT. The coupled bimodal grain structure and basal lamellar phases elevate local resolved shear stress, activating non-basal slip even in grains with low Schmid factors (SF), enabling enhanced cryogenic strength-ductility synergy.",

keywords = "Bimodal grain structure, LPSO phase, cryogenic deformation, hetero-deformation induced hardening",

author = "Jing Zuo and Mingquan Zhang and Taiki Nakata and Chao Xu and Xu Zhang and Enyu Guo and Guisong Wang and Kunkun Deng and Kaibo Nie and Xiaojun Wang and Shigeharu Kamado and Lin Geng",

note = "Publisher Copyright: {\textcopyright} 2026 The Author(s). Published by Informa UK Limited, trading as Taylor \& Francis Group.",

year = "2026",

doi = "10.1080/21663831.2026.2667429",

language = "英语",

journal = "Materials Research Letters",

issn = "2166-3831",

publisher = "Taylor and Francis Ltd.",

}

TY - JOUR

T1 - Cryogenic strength-ductility synergy in Mg-6Gd-1Zn alloys with bimodal grain structure coupled with basal lamellar phase

AU - Zuo, Jing

AU - Zhang, Mingquan

AU - Nakata, Taiki

AU - Xu, Chao

AU - Zhang, Xu

AU - Guo, Enyu

AU - Wang, Guisong

AU - Deng, Kunkun

AU - Nie, Kaibo

AU - Wang, Xiaojun

AU - Kamado, Shigeharu

AU - Geng, Lin

PY - 2026

Y1 - 2026

N2 - Achieving simultaneous strength and ductility at cryogenic temperature (CT) remains challenging for Mg alloys. An extruded Mg-6Gd-1Zn (wt.%) alloy with bimodal grain structure and basal lamellar phases exhibits anomalous strength-ductility synergy at CT. Mechanical incompatibility between soft DRXed and hard unDRXed regions generates geometrically necessary dislocations (GND) accumulation and dominant hetero-deformation-induced (HDI) hardening. Basal lamellar phases intensify elastic and plastic incompatibility, steepening GND gradients and back stress at CT. The coupled bimodal grain structure and basal lamellar phases elevate local resolved shear stress, activating non-basal slip even in grains with low Schmid factors (SF), enabling enhanced cryogenic strength-ductility synergy.

AB - Achieving simultaneous strength and ductility at cryogenic temperature (CT) remains challenging for Mg alloys. An extruded Mg-6Gd-1Zn (wt.%) alloy with bimodal grain structure and basal lamellar phases exhibits anomalous strength-ductility synergy at CT. Mechanical incompatibility between soft DRXed and hard unDRXed regions generates geometrically necessary dislocations (GND) accumulation and dominant hetero-deformation-induced (HDI) hardening. Basal lamellar phases intensify elastic and plastic incompatibility, steepening GND gradients and back stress at CT. The coupled bimodal grain structure and basal lamellar phases elevate local resolved shear stress, activating non-basal slip even in grains with low Schmid factors (SF), enabling enhanced cryogenic strength-ductility synergy.

KW - Bimodal grain structure

KW - LPSO phase

KW - cryogenic deformation

KW - hetero-deformation induced hardening

UR - https://www.scopus.com/pages/publications/105039094317

U2 - 10.1080/21663831.2026.2667429

DO - 10.1080/21663831.2026.2667429

M3 - 文章

AN - SCOPUS:105039094317

SN - 2166-3831

JO - Materials Research Letters

JF - Materials Research Letters

ER -

Cryogenic strength-ductility synergy in Mg-6Gd-1Zn alloys with bimodal grain structure coupled with basal lamellar phase

Abstract

Keywords

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