Dual-phase nano-glass-hydrides overcome the strength-ductility trade-off and magnetocaloric bottlenecks of rare earth based amorphous alloys

Liliang Shao, Qiang Luo (), Mingjie Zhang, Lin Xue, Jingxian Cui, Qianzi Yang, Haibo Ke (), Yao Zhang, Baolong Shen () and Weihua Wang
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Liliang Shao: Southeast University
Qiang Luo: Southeast University
Mingjie Zhang: Southeast University
Lin Xue: Hohai University
Jingxian Cui: Southeast University
Qianzi Yang: Southeast University
Haibo Ke: Songshan Lake Materials Laboratory
Yao Zhang: Southeast University
Baolong Shen: Southeast University
Weihua Wang: Songshan Lake Materials Laboratory

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

Abstract: Abstract Metal-hydrogen systems have attracted intense interest for diverse energy-related applications. However, metals usually reduce their ductility after hydrogenation. Here, we show that hydrogen can take the form of nano-sized ordered hydrides (NOH) homogeneously dispersed in a stable glassy shell, leading to remarkable enhancement in both strength and ductility. The yield strength is enhanced by 44% and the plastic strain is substantially improved from almost zero to over 70%, which is attributed to the created NOH and their interplay with the glassy shell. Moreover, the hydride-glass composite GdCoAlH possesses a giant magnetic entropy change (−ΔSM) of 18.7 J kg−1K−1 under a field change of 5 T, which is 105.5% larger than the hydrogen-free sample and is the largest value among amorphous alloys and related composites. The prominent ΔSM-ductility combination overcomes the bottlenecks of amorphous alloys as magnetic refrigerants. These results provide a promising strategy for property breakthrough of structural-functional alloys.

Date: 2024
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DOI: 10.1038/s41467-024-48531-7

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