Unveiling the correlation between anomalous hardening and grain boundary diffusional transformation in ω single-phase nano-grained Ti-Fe alloy

Shangshu Wu ¹Zongde Kou ²Song Tang ²Si Lan ²Qingquan Lai ³Junjie Wang ⁴Jinru Luo ⁵Xuefeng Xie ⁵Rong Huang ²Guiyuan Zheng ⁶Gerhard Wilde ⁷Tao Feng²

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作者信息

1. Herbert Gleiter Institute of Nanoscience,School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Suzhou Laboratory,Suzhou 215123,China
2. Herbert Gleiter Institute of Nanoscience,School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
3. Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 211816,China
4. Herbert Gleiter Institute of Nanoscience,School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Xi'an Rare Metal Materials Institute Co.Ltd,Xi'an 710016,China
5. Suzhou Laboratory,Suzhou 215123,China
6. State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Weihai Langu Institute for Materials Analysis Co.Ltd.,Weihai 264207,China
7. Herbert Gleiter Institute of Nanoscience,School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Institute of Materials Physics,University of Muenster,Wilhelm-Klemm Str.10,Muenster,48149,Germany
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Abstract

A metastable ω single-phase nanograined(NG)Ti-Fe alloy was synthesized using laser inert-gas conden-sation(IGC).Upon being annealed at 360 ℃,the NG Ti-Fe alloy exhibited a remarkable ultra-hardening,increasing the hardness from 4.7 to 8.6 GPa.Subsequent findings revealed an unexpected hardness en-hancement,rising from 6.6 GPa at 420 ℃ to 7.6 GPa at 460 ℃,despite the occurrence of grain growth.In-depth investigations into the strengthening mechanisms of the NG Ti-Fe alloy were conducted using in-situ synchrotron high-energy X-ray diffraction(XRD)and transmission electron microscopy(TEM).The comprehensive analysis unveiled that the diffusion-controlled structure evolution during annealing played a pivotal role in enhancing the alloy's mechanical properties.This study not only presents the synthesis of a novel metastable alloy but also provides valuable insights into the intricate relationship between diffusion-controlled structure evolution and the resulting superior mechanical properties.

Key words

Laser-inert gas condensation/Nanograined Ti-Fe alloy/Phase transformation/Dislocations/Strengthening

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出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

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影响因子：0.657

ISSN：1005-0302

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