Effects of Gd, Y Content on the Microstructure and Mechanical Properties of Mg-Gd-Y-Nd-Zr Alloy
Abstract
:1. Introduction
2. Alloy Design
3. Materials and Methods
4. Results
4.1. Microstructure of the As-Cast Sample
4.2. Microstructure of the Solution Treated Alloys
4.3. Mechanical Properties
5. Discussion
5.1. Formation Process of the Block Shaped Particles
5.2. Effects of Second Phases on Fracture
6. Conclusions
- (1)
- The as-cast ingots of the three alloys are mainly composed of α-Mg and non-equilibrium eutectic Mg5.05RE. The total contents of Gd and Y have no significant effect on the phase composition of the as-cast alloy.
- (2)
- The non-equilibrium eutectics are able to dissolve into the matrix when solution treated at 520 °C, but block shaped particles are left at the grain boundaries and within grains. The particles are RE-rich especially rich in Y element, and the compositions of the particles are independent of the total Gd and Y contents of the alloys while the quantity increases on increasing the total Gd and Y content.
- (3)
- The ultimate tensile strength of the solution treated samples increases as the Gd, Y content increases, while the ultimate tensile strength of the T6 treated samples decreases with increasing Gd, Y content. The increasing strength in solution treated samples is attributed to solid solution strengthening and excellent deformation capacity of the grains, and the decreasing strength in the T6 treated samples is ascribed to the increasing number of block shaped particles and the residual non-equilibrium eutectics, which deteriorate the mechanical properties.
- (4)
- The Mg-5.56Gd-3.38Y-1.11Nd-0.48Zr alloy exhibits the highest strength. The ultimate tensile strength and elongation of the alloy with T6 temper are 280 MPa and 1.3%, respectively. The high strength is attributed to the age hardening behavior and the decrease in block shaped particles.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Alloy Numbers | Element and Composition (wt%) | ||||
---|---|---|---|---|---|
Gd | Y | Nd | Zr | Mg | |
A | 10.16 | 4.31 | 0.97 | 0.43 | Balance |
B | 7.71 | 3.45 | 1.02 | 0.51 | Balance |
C | 5.56 | 3.38 | 1.11 | 0.48 | Balance |
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Tang, C.; Wu, K.; Liu, W.; Feng, D.; Wang, X.; Miao, G.; Yang, M.; Liu, X.; Li, Q. Effects of Gd, Y Content on the Microstructure and Mechanical Properties of Mg-Gd-Y-Nd-Zr Alloy. Metals 2018, 8, 790. https://doi.org/10.3390/met8100790
Tang C, Wu K, Liu W, Feng D, Wang X, Miao G, Yang M, Liu X, Li Q. Effects of Gd, Y Content on the Microstructure and Mechanical Properties of Mg-Gd-Y-Nd-Zr Alloy. Metals. 2018; 8(10):790. https://doi.org/10.3390/met8100790
Chicago/Turabian StyleTang, Changping, Kai Wu, Wenhui Liu, Di Feng, Xuezhao Wang, Guodong Miao, Maomao Yang, Xiao Liu, and Quan Li. 2018. "Effects of Gd, Y Content on the Microstructure and Mechanical Properties of Mg-Gd-Y-Nd-Zr Alloy" Metals 8, no. 10: 790. https://doi.org/10.3390/met8100790