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Indexed by:期刊论文

Date of Publication:2014-01-01

Journal:MATERIALS RESEARCH INNOVATIONS

Included Journals:SCIE、EI、Scopus

Volume:18

Issue:1

Page Number:14-19

ISSN No.:1432-8917

Key Words:Mg-5Gd-2Y-2Zn-0.5Zr alloy; LPSO structure; Microstructure; Mechanical properties

Abstract:Microstructures and mechanical properties of the Mg-5Gd-2Y-2Zn-0.5Zr alloy (wt-%) in the as cast and solution treated conditions have been investigated using optical microscopy, scanning electron microscope, X-ray diffraction, electron probe X-ray microanalyser and transmission electron microscope. The results show that after adding the element Y, the as cast Mg-5Gd-2Y-2Zn-0.5Zr alloy forms the Mg12Zn(Y, Gd) phase with 18R-long period stacking ordered (LPSO) structure, and the Gd atoms in the phase can slow down the transition process of 18R to 14H in high temperature treatment. LPSO phase in the grain boundary can ensure the strength of the alloy at room and elevated temperature through effectively preventing grain boundary sliding. At 250 degrees C, the alloy has shown the similar ultimate tensile strength and tensile yield strength under room temperature, 241 and 130 MPa respectively, and both with excellent elongation.