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Orientation-dependent defect accommodation and temperature-dependent strengthening in nanocrystalline magnesium: a molecular dynamics study

Year: 2026

Type: article

Abstract: This molecular dynamics study decouples the orientation-dependent cryogenic strengthening of nanocrystalline magnesium across temperatures from 100 K to 300 K. Results reveal an orientation-sensitive cryogenic strengthening effect. At 100 K, the hard-oriented model achieved the highest absolute strength of approximately 1.9 GPa via athermal {10-12} tensile twinning. Conversely, the soft-oriented model exhibited the greatest relative temperature sensitivity with a 21% increment governed by thermally activated basal slip. In comparison, the random-oriented model demonstrated the lowest sensitivity of 13% due to a synergistic slip-twinning interplay. These atomic-scale insights provide a mechanistic framework for tailoring cryogenic magnesium alloys through orientation control.

Source: The Philosophical Magazine A Journal of Theoretical Experimental and Applied Physics

DOI: 10.1080/14786435.2026.2756431

Authors: Qiang Luo, Chao He, Xiaoying Qian, Xiaodong Jia, Junzhuo Li, Zhenyu Zhang, Yongxing Li, Yongxin Zhang, Ying Zeng

Institutions: Southwest Jiaotong University, Hubei University of Automotive Technology

Language: English

Topic: Microstructure and mechanical properties

Subfield: Metals and Alloys

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, Department of Science and Technology of Sichuan Province, Natural Science Foundation of Sichuan Province

OpenAlex ID: W7154053787

FWCI:

Cites: 22

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Related to: 10