Realizing reversible phase transformation of shape memory ceramics constrained in aluminum

Wangshu Zheng, Yan Shi, Lei Zhao, Shuangyue Jia, Linghai Li, Chee Lip Gan (), Di Zhang () and Qiang Guo ()
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Wangshu Zheng: Shanghai Jiao Tong University
Yan Shi: Shanghai Jiao Tong University
Lei Zhao: Shanghai Jiao Tong University
Shuangyue Jia: Shanghai Jiao Tong University
Linghai Li: Shanghai Jiao Tong University
Chee Lip Gan: Nanyang Technological University
Di Zhang: Shanghai Jiao Tong University
Qiang Guo: Shanghai Jiao Tong University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Small-scale shape memory ceramics exhibit superior shape memory or superelasticity properties, while their integration into a matrix material and the subsequent attainment of their reversible tetragonal-monoclinic phase transformations remains a challenge. Here, cerium-doped zirconia (CZ) reinforced aluminum (Al) matrix composite is fabricated, and both macroscopic and microscopic mechanical tests reveal more than doubled compressive strength and energy absorbance of the composites as compared with pure Al. Full austenitization in the CZ single-crystal clusters is achieved when they are constrained by the Al matrix, and reversible martensitic transformation triggered by thermal or stress stimuli is observed in the composite micro-pillars without causing fracture in the composite. These results are interpreted by the strong geometric confinement offered by the Al matrix, the robust CZ/Al interface and the local three-dimensional particle network/force-chain configuration that effectively transfer mechanical loads, and the decent flowability of the matrix that accommodates the volume change during phase transformation.

Date: 2023
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DOI: 10.1038/s41467-023-42815-0

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