Simultaneously enhanced strength and plasticity of Ag2Se-based thermoelectric materials endowed by nano-twinned CuAgSe secondary phase

Article

Chen, Jie, Sun, Qiang, Bao, Deyu, Tian, Bang-Zhou, Wang, Zegao, Tang, Jun, Zhou, Dali, Yang, Lei and Chen, Zhi-Gang. 2021. "Simultaneously enhanced strength and plasticity of Ag2Se-based thermoelectric materials endowed by nano-twinned CuAgSe secondary phase." Acta Materialia. 220. https://doi.org/10.1016/j.actamat.2021.117335
Article Title

Simultaneously enhanced strength and plasticity of Ag2Se-based thermoelectric materials endowed by nano-twinned CuAgSe secondary phase

ERA Journal ID4742
Article CategoryArticle
AuthorsChen, Jie, Sun, Qiang, Bao, Deyu, Tian, Bang-Zhou, Wang, Zegao, Tang, Jun, Zhou, Dali, Yang, Lei and Chen, Zhi-Gang
Journal TitleActa Materialia
Journal Citation220
Article Number117335
Number of Pages8
Year2021
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN1359-6454
1873-2453
Digital Object Identifier (DOI)https://doi.org/10.1016/j.actamat.2021.117335
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S1359645421007151
Abstract

Thermoelectric materials strengthened by defect engineering can also suffer from the compromise of plasticity, and in turn results in negative effect on the processability, reliability and durability of thermoelectric devices. Here, we introduce nano-twinned CuAgSe secondary phase to achieve simultaneously increased compressive strength and plasticity of the β-Ag2Se pellets without obviously sacrificing the thermoelectric performance, as evidenced by our thermoelectric measurements. Our pellet shows a maximum compressive strength of 96 MPa, which is ∼104% higher than that of pristine Ag2Se, ascribed to the impeded crack propagation by the CuAgSe secondary phase. An extraordinary deformation value of ∼19% is observed at the maximum compressive strength, which is attributed to the intrinsically large plastic deformation of the Ag2Se matrix, the deformable nano-twinned CuAgSe secondary as well as the interaction between the Ag2Se matrix and the CuAgSe secondary phase. This work indicates that introducing nano-twinned secondary phase in thermoelectric materials is a promising strategy for developing high-performance thermoelectric materials with high strength and plasticity.

KeywordsCompressive strength; Silver selenide; Thermoelectric; Plasticity; Nanotwins
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400402. Chemical and thermal processes in energy and combustion
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Byline AffiliationsSichuan University, China
University of Queensland
Centre for Future Materials
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