Effect of Al on Grain Refinement and Mechanical Properties of Mg-3Nd Casting Alloy
- 10 Downloads
The effect of Al on the grain refinement and mechanical properties of as-cast Mg-3Nd alloy was investigated systematically by a series of microstructural analysis, solidification analysis and tensile tests. The results show that Al has an obvious refining effect on the as-cast Mg-3Nd alloy. With increasing Al content, the grain size of the as-cast Mg-3Nd alloy decreases firstly, then increases slightly after the Al content reaching 3 wt.%, and the minimum grain size of the Mg-3Nd alloy is 48 ± 4.0 μm. The refining mechanism can be attributed to the formation of Al2Nd particles, which play an important role in the heterogeneous nucleation. The strength and elongation of the Mg-3Nd alloy refined by Al also increase with increasing Al content and slightly decrease when the Al content is more than 3 wt.%, and the strengthening mechanism is attributed to the grain refinement as well as dispersed intermetallic particles. Furthermore, the microstructural thermal stability of the Mg-3Nd-3Al alloy is higher than that of the Mg-3Nd-0.5Zr alloy. Overall, the Mg-3Nd alloy with Al addition is a novel alloy with wide and potential application prospects.
Keywordsgrain refinement mechanical properties Mg-3Nd alloy thermal stability
The authors gratefully acknowledge the financial support from the Heilongjiang Province Natural Science Foundation (No. ZD2016011).
- 1.B. Chen, J.X. Zheng, C.M. Yang, Y.X. Chen, S.C. Cao, Z.X. Zhao, X.L. Li, and C. Lu, Mechanical Properties and Deformation Mechanisms of Mg-Gd-Y-Zr Alloy at Cryogenic and Elevated Temperatures, J. Mater. Eng. Perform., 2016, 26, p 1–11Google Scholar
- 2.L.Q. Wu, R.Z. Wu, L.G. Hou, J.H. Zhang, J.F. Sun, and M.L. Zhang, Microstructure and Mechanical Properties of CNT-Reinforced AZ31 Matrix Composites Prepared Using Hot-Press Sintering, J. Mater. Eng. Perform., 2017, 42, p 1–6Google Scholar
- 24.P. Villars, L.D. Calvert, and Pearson’s, Handbook of Crystallographic Data for Intermetallic Phases, Materials Park (OH), ASM, 1991. p 1032.Google Scholar