铸造Mg-Gd-Y-Nd-Zr合金在时效过程中的组织与性能演变

doi:10.11896/j.issn.1005-023X.2018.04.013

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Abstract Microstructure and mechanical property evolution of Mg-Gd-Y-Nd-Zr casting alloy during aging treatment were investigated by means of optical microscopy (OM), hardness testing, uniaxial tensile testing, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). The results indicated that the alloy exhibited good ductility and low strength after solution treatment, and the elongation exceeded 10%. As the aging time prolonged, the strength increased while the ductility decreased. The sample was in under-aged state when treated at 225 ℃ for 3 h, and β″was the main strengthening phase, which was coherent with the matrix. The fracture surface of the sample featured cleavage planes, dimples, tea-ring ridges and grain boundaries. In the peak-aged state, the strengthening phase was β', which is semi-coherent with the matrix. The ultimate tensile strength of the peak-aged sample exceeded 300 MPa, while the ductility decreased sharply. The fracture surface of the sample featured cleavage planes, tearing ridges and grain boundaries. The proportion of cleavage planes was obviously higher than that in under-aged sample, and the cleavage plane and the grain boundary were smooth. The strength increased but the ductility decreased when the sample was over-aged. Grain boundaries and cleavage planes were the main characterization of the fracture surface.

Key words： Mg-Gd-Y alloy aging treatment microstructure mechanical property fracture analysis

Published: 25 February 2018

CLC number:

TG146.2+2

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	Articles by authors
	TANG Changping
	LI Guodong
	LI Zhiyun
	SUN Xuanqi

Cite this article:

TANG Changping,LI Guodong,LI Zhiyun, et al. Microstructure and Mechanical Property Evolution of Mg-Gd-Y-Nd-Zr Casting Alloy During Aging Treatment[J]. Materials Reports, 2018, 32(4): 574-578.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.04.013 OR http://www.mater-rep.com/EN/Y2018/V32/I4/574

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