Effect of Rolling Process and Aging on the Microstructure and Properties of Cu-1.0Cr-0.1Zr Alloy
Abstract
:1. Introduction
2. Experimental Material and Procedures
3. Results and Discussion
3.1. Microstructure and Phase Analysis
3.2. Mechanical Properties and Microhardness
3.3. Fracture Morphology Analysis
3.4. Friction and Wear
4. Conclusions
- After different rolling treatments, the alloy plate transforms from equiaxed to layered when the crystal grains are in a solid solution state. Compared with the RTR and RTR + DCT treatments, the CR treatment resulted in a higher degree of grain fragmentation and promoted the precipitation of Cr phase. After aging treatment, the Cu-Zr mesophase compounds in the microstructure increased, and the alloys treated by CR and RTR + DCT showed partial recrystallization, and the number of twins in the CR alloy plate was more than that of RTR + DCT.
- Different rolling processes have different effects on the properties of the alloy plates. RTR can improve the mechanical properties and hardness of the plates, but the tensile strength of the alloy plates after CR treatment reaches 553 MPa, which is 71 MPa higher than that of the RTR alloy plates. After aging at 550 °C for 60 min, the tensile strength of the RTR + DCT and CR alloy plates did not increase significantly, but the elongation increased significantly. The elongation of RTR + DCT reached 47.3%, which was three times that of the rolled state.
- The hardness increases with the increase in the deformation. In particular, the hardness of the CR 90% alloy plates is the highest, reaching 170 HV. The alloy plates with a high strain degree before aging have an obvious strain-hardening effect, and the hardness shows an upward trend. The hardness of the alloy plates treated with CR is further improved under the action of precipitates. During the aging process, the dislocation density gradually decreases, the strain-hardening effect weakens, and the precipitation strengthening of the CR and RTR + DCT plates is not obvious, resulting in a more obvious decrease in alloy hardness
- The main wear mechanisms in the wear patterns of the CR and RTR + DCT alloy plates are adhesive wear and abrasive wear. The coefficient of friction fluctuates greatly in the early stages, which is due to the dominant mechanism of adhesive wear. In contrast, in the later stages of wear, abrasive wear is the dominant mechanism. The CR 90% alloy plates obtain the lowest friction coefficient in the TD direction, reaching 0.55, the wear rate of the alloy plates is 2.9 × 10−4 mm3/Nm, and indicates an obvious advantage compared to the commercial products.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Element | Cr | Zr | Si | Mg | Al | Cu |
---|---|---|---|---|---|---|
Content (wt.%) | 1.0 | 0.1 | 0.05 | 0.25 | 0.25 | balance |
Sample | /MPa | /% |
---|---|---|
RTR 90% | 484 5.5 | 11.8 0.8 |
RTR 90% + Aging | 453 5.3 | 37.2 1.5 |
RTR 90% + DCT | 472 5.4 | 14.7 0.9 |
RTR 90% + DCT + Aging | 485 5.5 | 47.9 1.7 |
CR 90% | 553 5.6 | 11.3 0.8 |
CR 90% + Aging | 540 5.8 | 38.1 1.5 |
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Zha, J.; Zhao, Y.; Qiao, Y.; Zou, H.; Hua, Z.; Zhu, W.; Han, Y.; Zu, G.; Ran, X. Effect of Rolling Process and Aging on the Microstructure and Properties of Cu-1.0Cr-0.1Zr Alloy. Materials 2023, 16, 1592. https://doi.org/10.3390/ma16041592
Zha J, Zhao Y, Qiao Y, Zou H, Hua Z, Zhu W, Han Y, Zu G, Ran X. Effect of Rolling Process and Aging on the Microstructure and Properties of Cu-1.0Cr-0.1Zr Alloy. Materials. 2023; 16(4):1592. https://doi.org/10.3390/ma16041592
Chicago/Turabian StyleZha, Jun, Yu Zhao, Yihui Qiao, Haohao Zou, Zeen Hua, Weiwei Zhu, Ying Han, Guoqing Zu, and Xu Ran. 2023. "Effect of Rolling Process and Aging on the Microstructure and Properties of Cu-1.0Cr-0.1Zr Alloy" Materials 16, no. 4: 1592. https://doi.org/10.3390/ma16041592