Targeting Superior Zero Thermal Expansion Material by the Concept of TRIP‐Invar

Abstract A key challenge for spin‐dominated functional materials is their suboptimal structural properties, a problem that restricts their widespread applications. Here, this limitation is addressed by introducing additional lattice degree of freedom. This is exemplified in a novel cobalt‐based alloy, which is targeted to demonstrate both the spin‐state transformation‐induced zero thermal expansion (Invar effect, ensuring precision) and lattice transformation‐induced plasticity (TRIP effect, enhancing safety), referred to as TRIP‐Invar. An unusual martensitic transformation exhibiting three‐phase coexistence has been observed under stressing at 77 K, which results in pronounced work hardening behavior and exceptional cryogenic toughness. Notably, reversible spin/lattice transformations enable intrinsic thermal repairability. This findings not only expand the categories within the Invar family, but also provide a reference for the discovery of other integrated structural and functional materials, enabling humanity's exploration of extreme environments like the poles and deep space.

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Publication Details

Journal
Advanced Functional Materials
Published
2025-09-28
DOI
https://doi.org/10.1002/adfm.202522039
Citations
2
Primary Topic
Thermal Expansion and Ionic Conductivity
Type
article
Field-Weighted Citation Impact
1.04
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article

Targeting Superior Zero Thermal Expansion Material by the Concept of TRIP‐Invar

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2 citations
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Thermal Expansion and Ionic Conductivity
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Targeting Superior Zero Thermal Expansion Material by the Concept of TRIP‐Invar

Chin‐Wei Wang, Kenichi Kato, Haowei Zhou, Yili Cao, Kun Lin, Youyong Li, Fenghua Chen, Wentao Yang, Chengyi Yu, Junyang He, Qinghua Zhang, Wenjie Li, Qiang Li, Jing Chen, Xianran Xing
article en
2 citations

Abstract

Abstract A key challenge for spin‐dominated functional materials is their suboptimal structural properties, a problem that restricts their widespread applications. Here, this limitation is addressed by introducing additional lattice degree of freedom. This is exemplified in a novel cobalt‐based alloy, which is targeted to demonstrate both the spin‐state transformation‐induced zero thermal expansion (Invar effect, ensuring precision) and lattice transformation‐induced plasticity (TRIP effect, enhancing safety), referred to as TRIP‐Invar. An unusual martensitic transformation exhibiting three‐phase coexistence has been observed under stressing at 77 K, which results in pronounced work hardening behavior and exceptional cryogenic toughness. Notably, reversible spin/lattice transformations enable intrinsic thermal repairability. This findings not only expand the categories within the Invar family, but also provide a reference for the discovery of other integrated structural and functional materials, enabling humanity's exploration of extreme environments like the poles and deep space.

Advanced Functional MaterialsVol. 36(16)
Beijing Institute of Technology (CN), Central South University (CN), National Synchrotron Radiation Research Center (TW), SPring-8 (JP), Taiyuan University of Science and Technology (CN), Taiyuan University of Technology (CN), University of Science and Technology Beijing (CN)
Openalex Percentile: Top 22%
Thermal Expansion and Ionic Conductivity
1.04
DOISourceOpenAlex
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