Mechanical Properties and Microstructural Evolution of TiNi-Based Intermetallic Alloy with Nb Addition
Abstract
:1. Introduction
2. Experimental Procedures
3. Results and Discussion
3.1. XRD Structural Analysis
3.2. Surface Morphology Analysis
3.3. Mechanical Properties
3.4. Strain Rate Sensitivity Effect
3.5. Fracture Surface Morphology Analysis
4. Conclusions
- The TiNi44Nb2 and TiNi44Nb4 alloys were composed principally of TiNi and Ti2Ni phase. However, for a higher Nb addition of 6 at.%, the microstructure contained a mixture of TiNi phase and eutectic TiNi + β-Nb phase.
- All the TiNi-Nb alloys had a dendritic structure. As the Nb content increased, the alloys underwent a densification of the dendritic structure and a grain refinement effect. The eutectic TiNi + β-Nb phase in the TiNi44Nb6 alloy was located at the grain boundaries and resulted in a significant softening effect.
- For both deformation regimes (i.e., quasi-static and dynamic), the maximum stress occurred in the TiNi44Nb4 alloy.
- As the level of Nb addition increased, the fracture mode transited from a predominantly brittle fracture mode (2 at.% Nb) to a mixed brittle-fracture mode (4 at.%), and finally a predominantly ductile fracture mode (6 at.%).
- In this study, we determined that the addition of Nb to TiNi alloy could enhance the mechanical properties for engineering applications. In particular, Nb addition can enhance the ductility and strength of the high strain rate application at room temperature.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Yang, H.-F.; Chen, T.-H.; Syu, Y.-Y. Mechanical Properties and Microstructural Evolution of TiNi-Based Intermetallic Alloy with Nb Addition. Materials 2022, 15, 3124. https://doi.org/10.3390/ma15093124
Yang H-F, Chen T-H, Syu Y-Y. Mechanical Properties and Microstructural Evolution of TiNi-Based Intermetallic Alloy with Nb Addition. Materials. 2022; 15(9):3124. https://doi.org/10.3390/ma15093124
Chicago/Turabian StyleYang, Hsin-Feng, Tao-Hsing Chen, and Ying-Ying Syu. 2022. "Mechanical Properties and Microstructural Evolution of TiNi-Based Intermetallic Alloy with Nb Addition" Materials 15, no. 9: 3124. https://doi.org/10.3390/ma15093124