Overcoming strength-ductility tradeoff with high pressure thermal treatment

Yao Tang, Haikuo Wang (), Xiaoping Ouyang (), Chao Wang, Qishan Huang, Qingkun Zhao, Xiaochun Liu, Qi Zhu, Zhiqiang Hou, Jiakun Wu, Zhicai Zhang, Hao Li, Yikan Yang, Wei Yang, Huajian Gao () and Haofei Zhou ()
Additional contact information
Yao Tang: College of Energy Engineering, Zhejiang University
Haikuo Wang: College of Energy Engineering, Zhejiang University
Xiaoping Ouyang: College of Energy Engineering, Zhejiang University
Chao Wang: College of Energy Engineering, Zhejiang University
Qishan Huang: Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University
Qingkun Zhao: Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University
Xiaochun Liu: Changsha University of Science and Technology
Qi Zhu: College of Engineering, Nanyang Technological University
Zhiqiang Hou: College of Energy Engineering, Zhejiang University
Jiakun Wu: College of Energy Engineering, Zhejiang University
Zhicai Zhang: College of Energy Engineering, Zhejiang University
Hao Li: College of Energy Engineering, Zhejiang University
Yikan Yang: College of Energy Engineering, Zhejiang University
Wei Yang: Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University
Huajian Gao: College of Engineering, Nanyang Technological University
Haofei Zhou: Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Conventional material processing approaches often achieve strengthening of materials at the cost of reduced ductility. Here, we show that high-pressure and high-temperature (HPHT) treatment can help overcome the strength-ductility trade-off in structural materials. We report an initially strong-yet-brittle eutectic high entropy alloy simultaneously doubling its strength to 1150 MPa and its tensile ductility to 36% after the HPHT treatment. Such strength-ductility synergy is attributed to the HPHT-induced formation of a hierarchically patterned microstructure with coherent interfaces, which promotes multiple deformation mechanisms, including dislocations, stacking faults, microbands and deformation twins, at multiple length scales. More importantly, the HPHT-induced microstructure helps relieve stress concentration at the interfaces, thereby arresting interfacial cracking commonly observed in traditional eutectic high entropy alloys. These findings suggest a new direction of research in employing HPHT techniques to help develop next generation structural materials.

Date: 2024
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DOI: 10.1038/s41467-024-48435-6

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