Abstract
In this work, the underlying mechanism responsible for the near-linear elastic deformation behavior of a dual-phase Ti-Nb alloy consisting of β and α″ phase with large recoverable strain was systematically elucidated. Based on in situ synchrotron X-ray diffraction (SXRD) analyses, it was found that besides intrinsic elastic deformation, a slight reversible β ↔ α″ stress-induced martensitic (SIM) transformation, which proceeded in a consecutive mode under the retarding effect of micro-defects, took place during the near-linear elastic deformation. After unloading, a small amount of residual macroscopic strain remained in the specimen due to the incomplete reverse α″ → β transformation on unloading. The high near-linear elastic deformability of the cold drawing (CD) Ti-Nb alloy has been revealed to be attributed to the coupling actions of intrinsic elasticity as well as the consecutive and reversible β ↔ α″ SIM transformation. Our research may contribute to a new avenue for the design and development of novel dual-phase Ti-based alloys with desirable elastic deformability.
Graphical abstract
摘要
本文系统地阐明了β和α″相双相Ti-Nb合金大可恢复应变的近线弹性变形行为的潜在机制。基于原位同步X射线衍射分析发现, 在近线性弹性变形过程中, 除了固有的弹性变形外, 还发生了轻微的可逆β ↔ α″应力诱导马氏体(SIM)相变, 该相变在微缺陷的延缓作用下以连续模式进行。卸载后, 由于不完全α″ → β逆相变, 试样中仍有少量残余应变。冷拔 Ti-Nb合金具有较高的近线弹性变形性能, 这是由于其固有弹性和连续可逆的β ↔ α″SIM相变的耦合作用所致。本研究为设计和开发具有良好弹性变形性能的新型双相钛基合金开辟了新的途径。
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. 52175410), the Six Talent Peaks Project in Jiangsu Province (No. 2019-XCL-113), Zhenjiang Science & Technology Program (No. GY2020001) and the Project of Faculty of Agricultural Equipment of Jiangsu University (No. NZXB20200101). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract (No. DE-AC02-06CH11357).
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Guo, Y., Ding, W., Ma, W. et al. Mechanism of a dual-phase Ti-Nb alloy exhibiting near-linear elastic deformation. Rare Met. 43, 2282–2289 (2024). https://doi.org/10.1007/s12598-023-02610-8
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DOI: https://doi.org/10.1007/s12598-023-02610-8