Tuning metastable austenite in a phase-transforming ceramic via matrix constraint

Martensitic phase-transforming ceramics can undergo reversible phase transformations under thermo-mechanical stimuli, yet brittle in their monolithic, polycrystalline form. Incorporating these ceramics into matrices thereby metastabilizing austenite gives rise to a significant toughening effect by t...

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Main Authors: Zheng, Wangshu, Zhao, Lei, Jia, Shuangyue, Li, Linghai, Liu, Yuyang, Han, Yifan, Chen, Xi, Jin, Xuejun, Gan, Chee Lip, Guo, Qiang
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/181495
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1814952024-12-05T05:13:50Z Tuning metastable austenite in a phase-transforming ceramic via matrix constraint Zheng, Wangshu Zhao, Lei Jia, Shuangyue Li, Linghai Liu, Yuyang Han, Yifan Chen, Xi Jin, Xuejun Gan, Chee Lip Guo, Qiang School of Materials Science and Engineering Engineering Metastability engineering Kinetics and thermodynamics Martensitic phase-transforming ceramics can undergo reversible phase transformations under thermo-mechanical stimuli, yet brittle in their monolithic, polycrystalline form. Incorporating these ceramics into matrices thereby metastabilizing austenite gives rise to a significant toughening effect by triggering martensitic transformation. However, it remains a challenge to stabilize the austenite if the matrix is a light metal, because of its low strength, low melting temperature and high-chemical reactivity. In this study, we constructed a phase-transforming ceramic-metal (zirconia-aluminum) composite with tunable metastable austenite fractions via matrix constraint. Systematic experiments combined with thermodynamic and kinetic models uncover the effect of the matrix constraint and doping concentration on austenitization. By varying the processing parameters, we realized extensive tunability in metastable austenite content (0–100 wt.%) under different cerium doping concentrations (6–12 mol.%) in a wide range of processing temperatures (350–550°C). Our findings reveal the underlying mechanisms for promoting, stabilizing and fine-manipulating austenitization in martensitic phase-transforming ceramics under geometrical constraint, and may lay out the foundation for more extensive studies and applications of these phase-transforming ceramic-based composites. This work is financially supported from the National Key R&D program of China (2022YFB3705704), and the Na tional Natural Science Foundation of China (52192595, 52001204 and 523B2005). 2024-12-05T05:13:50Z 2024-12-05T05:13:50Z 2024 Journal Article Zheng, W., Zhao, L., Jia, S., Li, L., Liu, Y., Han, Y., Chen, X., Jin, X., Gan, C. L. & Guo, Q. (2024). Tuning metastable austenite in a phase-transforming ceramic via matrix constraint. Acta Materialia, 276, 120118-. https://dx.doi.org/10.1016/j.actamat.2024.120118 1359-6454 https://hdl.handle.net/10356/181495 10.1016/j.actamat.2024.120118 2-s2.0-85196825498 276 120118 en Acta Materialia © 2024 Acta Materialia Inc. Published by Elsevier Ltd. All rights are reserved,
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Metastability engineering
Kinetics and thermodynamics
spellingShingle Engineering
Metastability engineering
Kinetics and thermodynamics
Zheng, Wangshu
Zhao, Lei
Jia, Shuangyue
Li, Linghai
Liu, Yuyang
Han, Yifan
Chen, Xi
Jin, Xuejun
Gan, Chee Lip
Guo, Qiang
Tuning metastable austenite in a phase-transforming ceramic via matrix constraint
description Martensitic phase-transforming ceramics can undergo reversible phase transformations under thermo-mechanical stimuli, yet brittle in their monolithic, polycrystalline form. Incorporating these ceramics into matrices thereby metastabilizing austenite gives rise to a significant toughening effect by triggering martensitic transformation. However, it remains a challenge to stabilize the austenite if the matrix is a light metal, because of its low strength, low melting temperature and high-chemical reactivity. In this study, we constructed a phase-transforming ceramic-metal (zirconia-aluminum) composite with tunable metastable austenite fractions via matrix constraint. Systematic experiments combined with thermodynamic and kinetic models uncover the effect of the matrix constraint and doping concentration on austenitization. By varying the processing parameters, we realized extensive tunability in metastable austenite content (0–100 wt.%) under different cerium doping concentrations (6–12 mol.%) in a wide range of processing temperatures (350–550°C). Our findings reveal the underlying mechanisms for promoting, stabilizing and fine-manipulating austenitization in martensitic phase-transforming ceramics under geometrical constraint, and may lay out the foundation for more extensive studies and applications of these phase-transforming ceramic-based composites.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Zheng, Wangshu
Zhao, Lei
Jia, Shuangyue
Li, Linghai
Liu, Yuyang
Han, Yifan
Chen, Xi
Jin, Xuejun
Gan, Chee Lip
Guo, Qiang
format Article
author Zheng, Wangshu
Zhao, Lei
Jia, Shuangyue
Li, Linghai
Liu, Yuyang
Han, Yifan
Chen, Xi
Jin, Xuejun
Gan, Chee Lip
Guo, Qiang
author_sort Zheng, Wangshu
title Tuning metastable austenite in a phase-transforming ceramic via matrix constraint
title_short Tuning metastable austenite in a phase-transforming ceramic via matrix constraint
title_full Tuning metastable austenite in a phase-transforming ceramic via matrix constraint
title_fullStr Tuning metastable austenite in a phase-transforming ceramic via matrix constraint
title_full_unstemmed Tuning metastable austenite in a phase-transforming ceramic via matrix constraint
title_sort tuning metastable austenite in a phase-transforming ceramic via matrix constraint
publishDate 2024
url https://hdl.handle.net/10356/181495
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