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Lamellar Degradation Induced Brittle-ductile Transition of Polysynthetic Twinned TiAl
Research Article | Published: 29 December 2025
Journal of Advanced Materials Research Volume 1, Issue 1, 2025: 56-68
Volume 1, Issue 1, Journal of Advanced Materials Research
Volume 1, Issue 1, 2025
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Journal of Advanced Materials Research, Volume 1, Issue 1, 2025: 56-68

Open Access | Research Article | 29 December 2025
Lamellar Degradation Induced Brittle-ductile Transition of Polysynthetic Twinned TiAl
by
Henggao Xiang Henggao Xiang 1,2,†
Demin Zhu Demin Zhu 1,†
Xu Liu Xu Liu 1
Yang Chen Yang Chen 1,2 *
Zhixiang Qi Zhixiang Qi 1,2 *
Guang Chen Guang Chen 1
1 State Key Laboratory of Light Superalloys / Advanced Casting Technologies, Nanjing University of Science and Technology, Nanjing 210094, China
2 Jiangsu Belight Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China
† These authors contributed equally to this work
* Corresponding Authors: Yang Chen, [email protected] ; Zhixiang Qi, [email protected]
DOI: 10.62762/JAMR.2025.522742
ARK: ark:/57805/jamr.2025.522742
Received: 20 November 2025, Accepted: 17 December 2025, Published: 29 December 2025  
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Abstract
Intermetallic compounds including TiAl and NiAl suffer from an abrupt brittle-ductile transition at a critical temperature, limiting their higher temperature applications. Conventional viewpoints attribute this transition to thermally activated dislocation actions or dynamic recrystallization. Here, we discover a novel brittle-ductile transition mechanism in polysynthetic twinned TiAl, driven by lamellar degradation, which significantly deviates from the conventional mechanisms. The results demonstrate that the lamellar degradation is primarily caused by the \( \alpha_2 \rightarrow \gamma \) phase transformation at the brittle-ductile transition temperature, which stems from a non-monotonic increase in the stacking fault energy of \( \alpha_2 \) phase with temperature. This unconventional transition can be described efficiently by an energy density-based strength model, offering new insights into the brittle-ductile transition behavior of intermetallic compounds at elevated temperatures.
Graphical Abstract
Lamellar Degradation Induced Brittle-ductile Transition of Polysynthetic Twinned TiAl
Keywords
polysynthetic twinned TiAl
brittle-ductile transition
lamellar degradation
high temperature strength
Data Availability Statement
Data will be made available on request.
Funding
This work was supported in part by the National Natural Science Foundation of China under Grant 12202201, Grant 52571145, Grant 92463301, Grant 52433016, Grant 92163215, Grant 52305379, and Grant 52174364; in part by the Natural Science Foundation of Jiangsu Province under Grant BK20220918, Grant BK20243066, and Grant BE2023024; in part by the Fundamental Research Funds for the Central Universities under Grant 30922010711 and Grant 30922010202; in part by the Development Funds of State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology under Grant P2024-004.
Conflicts of Interest
The authors declare no conflicts of interest.
Ethical Approval and Consent to Participate
Not applicable.
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APA Style
Xiang, H., Zhu, D., Liu, X., Chen, Y., Qi, Z., &Chen, G. (2025). Lamellar Degradation Induced Brittle-ductile Transition of Polysynthetic Twinned TiAl. Journal of Advanced Materials Research, 1(1), 56–68. https://doi.org/10.62762/JAMR.2025.522742
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TY  - JOUR
AU  - Xiang, Henggao
AU  - Zhu, Demin
AU  - Liu, Xu
AU  - Chen, Yang
AU  - Qi, Zhixiang
AU  - Chen, Guang
PY  - 2025
DA  - 2025/12/29
TI  - Lamellar Degradation Induced Brittle-ductile Transition of Polysynthetic Twinned TiAl
JO  - Journal of Advanced Materials Research
T2  - Journal of Advanced Materials Research
JF  - Journal of Advanced Materials Research
VL  - 1
IS  - 1
SP  - 56
EP  - 68
DO  - 10.62762/JAMR.2025.522742
UR  - https://www.icck.org/article/abs/JAMR.2025.522742
KW  - polysynthetic twinned TiAl
KW  - brittle-ductile transition
KW  - lamellar degradation
KW  - high temperature strength
AB  - Intermetallic compounds including TiAl and NiAl suffer from an abrupt brittle-ductile transition at a critical temperature, limiting their higher temperature applications. Conventional viewpoints attribute this transition to thermally activated dislocation actions or dynamic recrystallization. Here, we discover a novel brittle-ductile transition mechanism in polysynthetic twinned TiAl, driven by lamellar degradation, which significantly deviates from the conventional mechanisms. The results demonstrate that the lamellar degradation is primarily caused by the \( \alpha_2 \rightarrow \gamma \) phase transformation at the brittle-ductile transition temperature, which stems from a non-monotonic increase in the stacking fault energy of \( \alpha_2 \) phase with temperature. This unconventional transition can be described efficiently by an energy density-based strength model, offering new insights into the brittle-ductile transition behavior of intermetallic compounds at elevated temperatures.
SN  - 3070-5851
PB  - Institute of Central Computation and Knowledge
LA  - English
ER  -
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@article{Xiang2025Lamellar,
  author = {Henggao Xiang and Demin Zhu and Xu Liu and Yang Chen and Zhixiang Qi and Guang Chen},
  title = {Lamellar Degradation Induced Brittle-ductile Transition of Polysynthetic Twinned TiAl},
  journal = {Journal of Advanced Materials Research},
  year = {2025},
  volume = {1},
  number = {1},
  pages = {56-68},
  doi = {10.62762/JAMR.2025.522742},
  url = {https://www.icck.org/article/abs/JAMR.2025.522742},
  abstract = {Intermetallic compounds including TiAl and NiAl suffer from an abrupt brittle-ductile transition at a critical temperature, limiting their higher temperature applications. Conventional viewpoints attribute this transition to thermally activated dislocation actions or dynamic recrystallization. Here, we discover a novel brittle-ductile transition mechanism in polysynthetic twinned TiAl, driven by lamellar degradation, which significantly deviates from the conventional mechanisms. The results demonstrate that the lamellar degradation is primarily caused by the \( \alpha\_2 \rightarrow \gamma \) phase transformation at the brittle-ductile transition temperature, which stems from a non-monotonic increase in the stacking fault energy of \( \alpha\_2 \) phase with temperature. This unconventional transition can be described efficiently by an energy density-based strength model, offering new insights into the brittle-ductile transition behavior of intermetallic compounds at elevated temperatures.},
  keywords = {polysynthetic twinned TiAl, brittle-ductile transition, lamellar degradation, high temperature strength},
  issn = {3070-5851},
  publisher = {Institute of Central Computation and Knowledge}
}
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