Effect of heat treatment on the microstructure and micromechanical properties of the rapidly solidified Mg61.7Zn34Gd4.3 alloy containing icosahedral phase

Wen-bo Luo; Zhi-yong Xue; Wei-min Mao

doi:10.1007/s12613-019-1799-4

Volume 26 Issue 7

Jul. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(7): 869-877

Wen-bo Luo, Zhi-yong Xue, and Wei-min Mao, Effect of heat treatment on the microstructure and micromechanical properties of the rapidly solidified Mg_61.7Zn₃₄Gd_4.3 alloy containing icosahedral phase, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 869-877. https://doi.org/10.1007/s12613-019-1799-4

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Wen-bo Luo, Zhi-yong Xue, and Wei-min Mao, Effect of heat treatment on the microstructure and micromechanical properties of the rapidly solidified Mg61.7Zn34Gd4.3 alloy containing icosahedral phase, Int. J. Miner. Metall. Mater., 26(2019), No. 7, pp. 869-877. https://doi.org/10.1007/s12613-019-1799-4

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Research Article

Effect of heat treatment on the microstructure and micromechanical properties of the rapidly solidified Mg_61.7Zn₃₄Gd_4.3 alloy containing icosahedral phase

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Corresponding author:
Wei-min Mao E-mail: mao_wm@ustb.edu.cn
Received: 5 September 2018; Revised: 7 January 2019; Accepted: 11 January 2019

Abstract

Abstract

In this paper, the microstructure evolution of the rapidly solidified (RS) Mg_61.7Zn₃₄Gd_4.3 (at%, atomic ratio) alloy at high temperatures was investigated. The hardness and elastic modulus of the main precipitated phases were also analyzed and compared with those of the α-Mg matrix on the basis of nanoindentation tests. The results show that the RS alloy consists of either a petal-like icosahedral quasicrystal (IQC) phase (~20 μm) and block-shaped H1 phase (~15 μm) or IQC particles with an average grain size of~107 nm as well as a small proportion of amorphous phase, which mainly depends on the holding time at the liquid temperature and the thickness of the ribbons. The IQC phase gradually transforms at 400℃ to a short-rod-shaped μ-phase (Mg_28.6Zn_63.8Gd_7.7) with a hexagonal structure. The hardness of the IQC phase is higher than that of H1 phase, and both phases exhibit a higher hardness than the α-Mg matrix and the μ-phase. The elasticity of the H1 phase is superior to that of the α-Mg matrix. The IQC phase possesses a higher elastic modulus than H1 phase. The easily formed H1 phase exhibits the poorest plastic deformation capacity among these phases but a higher elastic modulus than the α-Mg matrix.
- magnesium alloy;
- icosahedral phase;
- rapidly solidification;
- nanoindentation;
- micromechanical properties

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