Revealing the room temperature superplasticity in bulk recrystallized molybdenum

Wenshuai Chen, Xiyao Li, Shenbao Jin, Lunwei Yang, Yan Li, Xueliang He, Wanting Zhang, Yinxing Wu, Zhilin Hui, Zhimin Yang, Jian Yang, Wei Xiao, Gang Sha (), Jiangwei Wang () and Zenglin Zhou ()
Additional contact information
Wenshuai Chen: China GRINM Group Co., Ltd.
Xiyao Li: Zhejiang University
Shenbao Jin: Nanjing University of Science and Technology
Lunwei Yang: GRIMAT Engineering Institute Co., Ltd.
Yan Li: GRIMAT Engineering Institute Co., Ltd.
Xueliang He: GRIMAT Engineering Institute Co., Ltd.
Wanting Zhang: China GRINM Group Co., Ltd.
Yinxing Wu: Nanjing University of Science and Technology
Zhilin Hui: GRIMAT Engineering Institute Co., Ltd.
Zhimin Yang: China GRINM Group Co., Ltd.
Jian Yang: GRIMAT Engineering Institute Co., Ltd.
Wei Xiao: GRIMAT Engineering Institute Co., Ltd.
Gang Sha: Nanjing University of Science and Technology
Jiangwei Wang: Zhejiang University
Zenglin Zhou: China GRINM Group Co., Ltd.

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Body-centered cubic refractory metallic materials exhibit excellent high-temperature strength, but often suffer from brittle intergranular fracture due to the recrystallization-induced enrichment of trace elements at grain boundaries (GBs). Here, we report a fully-recrystallized pure molybdenum (Mo) material with room temperature (RT) superplasticity, fabricated by a facile method of powder metallurgy, Y-type hot rolling and annealing. By engineering the ultralow concentration of O at GBs, the inherent GB brittleness of Mo can be largely eliminated, which, in conjunction with high fractions of soft texture and low angle GBs, enables a significant development of ordered dislocation networks and the effective dislocation transmission across low angle GBs. Synergy of these factors greatly suppress the brittle intergranular fracture of Mo, contributing to an enhanced deformability of 108.7% at RT. These findings should have general implication for fabricating a broad class of refractory metals and alloys toward harsh applications.

Date: 2023
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DOI: 10.1038/s41467-023-44056-7

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