Evolution of Microstructure and Mechanical Properties of the Rheo-Diecast Mg-12Gd-3Y-1Zn-0.4Zr Alloy during Heat Treatment

Abstract:

The SEED (Swirled Enthalpy Equilibrium Device) process is the typical high solid fraction (with about 40-60% of solid) rheo-diecast process. The high strength Mg-12Gd-3Y-1Zn-0.4Zr magnesium alloy was successfully produced using SEED process. The microstructure and mechanical properties of rheo-diecast Mg-12Gd-3Y-1Zn-0.4Zr alloy during solution and ageing heat treatment process were studied in this paper. Optical microscopy (OM) and transmission electron microscopy (TEM) were employed to study the evolution of microstructure and mechanical properties. The cast alloy exhibited a microstructure consisting of equiaxed primary solidified grains and together with eutectics. The eutectics were partially dissolved into a-Mg matrix after solution heat treatment. The tensile properties of rheo-diecast Mg-12Gd-3Y-1Zn-0.4Zr alloy were substantially enhanced after T6 heat treatment.

• Periodical: Solid State Phenomena (Volume 347)
• Pages: 127-132
• DOI: https://doi.org/10.4028/p-k6uXTC
• Online since: August 2023
• Authors: Da Quan Li, Zhi Yu Chang, Jian Feng*, Yu Juan Wu, Li Ming Peng
• Keywords: Heat Treatment, Mechanical Properties, Mg-Gd-Y-Zn-Zr, Microstructure, Rheo-Diecast

References

[1] D. Li, X. Liang, F. Zhang, S. Chen, F. Zhang, J. Feng, Recent Industrial Application and Perspectives of Rheo-Diecast Process in China, Solid State Phenomena, 327(2022)238-243.

DOI: 10.4028/www.scientific.net/ssp.327.238

[2] P. Cote, M. Larouche, X.G. Chen, New Decelopments with the SEED Technology, Solid State Phenomena, 192-193(2013)373-378.

[3] M. Tebib, F. Ajersch, X. Chen, Rheological Properties and Microstructure of Hypereutectic Semi-Solid Al-Si-Mg Alloys Using Rheocasting Route, Solid State Phenomena, 192-193(2013)323-328.

DOI: 10.4028/www.scientific.net/ssp.192-193.323

[4] H. Zhao, D. Li, M. Luo, S.P. Midson, Q. Zhu, Impact of Intensification Pressure and Grain Refiner on the Hot Tearing Susceptibility of a Semi-Solid Cast Al-Zn-Mg-Cu Alloy, Solid State Phenomena, 285(2019)283-289.

DOI: 10.4028/www.scientific.net/ssp.285.283

[5] Z. Chang, Q. Deng, Q. Lan, J. Feng, D. Li, B. Liu, Y. Wu, L. Peng, W. Ding, Microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy prepared by rheo-diecasting, Materials Science and Engineering A, 848(2022)143287

DOI: 10.1016/j.msea.2022.143287

[6] Z. Zhen, M. Qian, S. Ji, Z. Fan, The effects of rheo-diecasting on the integrity and mechanical properties of Mg-6Al-1Zn, Scripta Materialia, 54(2006)207-211.

DOI: 10.1016/j.scriptamat.2005.09.032

[7] F. Czerwinski, A. Zielinska-Lipiec, P.J. Pinet, J. Overbeeke, Correlating the microstructure and tensile properties of a thixomolded AZ91D magnesium alloy, Acta Materialia, 49(2001)1225-1235.

DOI: 10.1016/s1359-6454(01)00015-5

[8] J.F. Nie, K. Oh-ishi, X. Gao, K. Hono, Solute segregation and precipitation in a creep-resistant Mg-Gd-Zn alloy, Acata Materialia, 56(2008)6061-6076.

DOI: 10.1016/j.actamat.2008.08.025

[9] S.M. He, X.Q. Zeng, L.M. Peng, X. Gao, J.F. Nie, W.J. Ding, Microstructure and strengthening mechanism of high strength Mg-10Gd-2Y-0.5Zr alloy, Journal of Alloys and Compounds, 427(2007)316-323.

DOI: 10.1016/j.jallcom.2006.03.015

[10] D. Wang, P.H. Fu, L.M. Peng, Y.X. Wang, W.J. Ding, A study of microstructure, mechanical behavior and strengthen mechanism in the Mg-10Gd-0.2Zn-(Y)-0.4Zr alloy, Materials Science and Engineering A, 793(2020)139881.

DOI: 10.1016/j.msea.2020.139881