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Microstructure and phase transformation of forged Mg–3.7Zn–0.3Y–0.3Gd quasicrystal alloy

Published online by Cambridge University Press:  28 April 2015

Yang Yang ,
Kui Zhang ,
Minglong Ma  and
Xinggang Li
Yang Yang*
Affiliation:
States Key Lab, General Research Institute of Nonferrous Metals, Beijing 100012, China
Kui Zhang*
Affiliation:
States Key Lab, General Research Institute of Nonferrous Metals, Beijing 100012, China
Minglong Ma
Affiliation:
States Key Lab, General Research Institute of Nonferrous Metals, Beijing 100012, China
Xinggang Li
Affiliation:
States Key Lab, General Research Institute of Nonferrous Metals, Beijing 100012, China
*
a)Address all correspondence to this author. e-mail: zhkui@grinm.com
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Abstract

An alloy with the composition of Mg–3.7Zn–0.3Y–0.3Gd (in at.%) which contains quasicrystal phase was studied by multiple means. The as-cast alloy has dendritic structure and consists of α-Mg, I-phase, W-phase, and Mg–Zn precipitations. The alloy was forged one pass and annealed at 440 °C for 4 h, then followed by two passes of compressions. Eutectics were crushed and partially dissolved after deformation and annealing. The tensile strength increased after each forge pass. Submicron scale particles precipitated all around the grains during the deformations, and the amount of precipitations was proportional to the amount of deformations. These precipitated particles were observed by high resolution transmission electron microscopy (TEM). The existence of rhomboid W'-phase with face center cubic (FCC) structure and globular I-phase was confirmed. A quasi-periodicity lamellar phase combined with I-phase was founded, which was considered to be the transient phase between I-phase and W'-phase. This phase had orientation relationship with $\left( {1\bar 101} \right)$ of α-Mg basis and one of the 5-fold planar of the I-phase.

Keywords

magnesium alloyquasicrystallhot deformation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 10 , 28 May 2015 , pp. 1693 - 1700
Copyright
Copyright © Materials Research Society 2015 

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