Effect of heat treatment on the microstructure and micromechanical properties of the rapidly solidified Mg61.7Zn34Gd4.3 alloy containing icosahedral phase
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第7期
论文作者：Wen-bo Luo Zhi-yong Xue Wei-min Mao
文章页码：869 - 877
摘 要：In this paper, the microstructure evolution of the rapidly solidified（RS） Mg61.7Zn34Gd4.3（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°C to a short-rod-shaped μ-phase(Mg28.6Zn63.8Gd7.7) 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.
Wen-bo Luo，Zhi-yong Xue，Wei-min Mao
摘 要：In this paper, the microstructure evolution of the rapidly solidified（RS） Mg61.7Zn34Gd4.3（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°C to a short-rod-shaped μ-phase(Mg28.6Zn63.8Gd7.7) 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.
关键词：
