Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloys
High-entropy alloys (HEAs) are of more chemical inhomogeneity than traditional alloys. How thermal effects perturb entropy and chemical fluctuations is a major scientific issue. In this study, selected benchmark phenomena revealed by in-situ synchrotron X-ray mapping demonstrates how local chemical...
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Elsevier
2025-03-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525000437 |
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| author | E-Wen Huang Tu-Ngoc Lam Zachary H. Aitken Mao-Yuan Luo Nien-En Chiang Yuh Sun Jo-Chi Tseng Ching-Yu Chiang Wan-Zhen Hsieh Wen-Jay Lee Yong-Wei Zhang Peter K. Liaw Che-Wei Tsai |
| author_facet | E-Wen Huang Tu-Ngoc Lam Zachary H. Aitken Mao-Yuan Luo Nien-En Chiang Yuh Sun Jo-Chi Tseng Ching-Yu Chiang Wan-Zhen Hsieh Wen-Jay Lee Yong-Wei Zhang Peter K. Liaw Che-Wei Tsai |
| author_sort | E-Wen Huang |
| collection | DOAJ |
| description | High-entropy alloys (HEAs) are of more chemical inhomogeneity than traditional alloys. How thermal effects perturb entropy and chemical fluctuations is a major scientific issue. In this study, selected benchmark phenomena revealed by in-situ synchrotron X-ray mapping demonstrates how local chemical gradients control temperature-dependent behaviors in HEAs. Specifically, the gradient chemical layers in the core/shell structure play an important role in the thermally-induced phase transformation of Cu15Ni35Ti50-x(HfZr)x high-entropy shape-memory alloys (HESMAs). The dendritic microstructure in Cu15Ni35Ti20(HfZr)30 exhibits the mixing enthalpy-driven pronounced composition inhomogeneity of an Ni-Hf-rich core and Cu-Zr-Ti-rich shell, demonstrated by thermodynamics calculations and second nearest-neighbor modified embedded atom method (2NN MEAM) formalism. The shell acts as an interfacial energy barrier for the stable martensitic transformation that occurred primarily in the effective Ni-Hf-rich core of the Cu15Ni35Ti20(HfZr)30. The temperature-dependent Gibbs-free energy agrees with the Cu movement, which widens the thermally-induced gradient layer of the elemental redistribution. Our findings are conducive to a potential design strategy of tailoring gradient chemical core/shell HEAs for stable high-temperature shape-memory applications. |
| format | Article |
| id | doaj-art-905730801ed642fb9f5f04e80f572721 |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-905730801ed642fb9f5f04e80f5727212025-02-04T04:10:17ZengElsevierMaterials & Design0264-12752025-03-01251113623Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloysE-Wen Huang0Tu-Ngoc Lam1Zachary H. Aitken2Mao-Yuan Luo3Nien-En Chiang4Yuh Sun5Jo-Chi Tseng6Ching-Yu Chiang7Wan-Zhen Hsieh8Wen-Jay Lee9Yong-Wei Zhang10Peter K. Liaw11Che-Wei Tsai12Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan; High Entropy Materials Center, National Tsing Hua University, Hsinchu 30013, Taiwan; Corresponding author at: Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan.Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan; Department of Physics Education, School of Education, Can Tho University, Can Tho 900000, Viet Nam; Corresponding author at: Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan.Institute of High Performance Computing, Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of SingaporeDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, TaiwanDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, TaiwanDepartment of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu 30010, TaiwanDiffraction and Scattering Division, Japan Synchrotron Radiation Research Institute, Spring 8, 1 1 1 Koto, Sayo cho, Sayo gun Hyogo 679 5198, JapanNational Synchrotron Radiation Research Center, Hsinchu 30076, TaiwanNational Synchrotron Radiation Research Center, Hsinchu 30076, TaiwanNational Center for High-Performance Computing, Taichung City, 40763, TaiwanInstitute of High Performance Computing, Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of SingaporeDepartment of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USAHigh Entropy Materials Center, National Tsing Hua University, Hsinchu 30013, Taiwan; Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan; Corresponding author at: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan.High-entropy alloys (HEAs) are of more chemical inhomogeneity than traditional alloys. How thermal effects perturb entropy and chemical fluctuations is a major scientific issue. In this study, selected benchmark phenomena revealed by in-situ synchrotron X-ray mapping demonstrates how local chemical gradients control temperature-dependent behaviors in HEAs. Specifically, the gradient chemical layers in the core/shell structure play an important role in the thermally-induced phase transformation of Cu15Ni35Ti50-x(HfZr)x high-entropy shape-memory alloys (HESMAs). The dendritic microstructure in Cu15Ni35Ti20(HfZr)30 exhibits the mixing enthalpy-driven pronounced composition inhomogeneity of an Ni-Hf-rich core and Cu-Zr-Ti-rich shell, demonstrated by thermodynamics calculations and second nearest-neighbor modified embedded atom method (2NN MEAM) formalism. The shell acts as an interfacial energy barrier for the stable martensitic transformation that occurred primarily in the effective Ni-Hf-rich core of the Cu15Ni35Ti20(HfZr)30. The temperature-dependent Gibbs-free energy agrees with the Cu movement, which widens the thermally-induced gradient layer of the elemental redistribution. Our findings are conducive to a potential design strategy of tailoring gradient chemical core/shell HEAs for stable high-temperature shape-memory applications.http://www.sciencedirect.com/science/article/pii/S0264127525000437High-entropy shape-memory alloysPhase transformationMixing enthalpyGradient structureCore/shell structure |
| spellingShingle | E-Wen Huang Tu-Ngoc Lam Zachary H. Aitken Mao-Yuan Luo Nien-En Chiang Yuh Sun Jo-Chi Tseng Ching-Yu Chiang Wan-Zhen Hsieh Wen-Jay Lee Yong-Wei Zhang Peter K. Liaw Che-Wei Tsai Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloys Materials & Design High-entropy shape-memory alloys Phase transformation Mixing enthalpy Gradient structure Core/shell structure |
| title | Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloys |
| title_full | Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloys |
| title_fullStr | Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloys |
| title_full_unstemmed | Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloys |
| title_short | Mixing-enthalpy modulation on phase transformation in the gradient chemical core/shell high-entropy shape-memory alloys |
| title_sort | mixing enthalpy modulation on phase transformation in the gradient chemical core shell high entropy shape memory alloys |
| topic | High-entropy shape-memory alloys Phase transformation Mixing enthalpy Gradient structure Core/shell structure |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525000437 |
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