Affiliation:
1. School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin, People's Republic of China
Abstract
In this paper, the effect of cooling rate on solidification behaviour, microstructure evolution and mechanical properties of Al-refined Mg-9Gd-4Y-1Zn was studied. As cooling rate decreased, grain size increased and when cooling rate was 32.5°C/s, grain size was the smallest (30.57 µm). The second phases included lamellar LPSO, block-like Mg3 (Zn, RE), granular Al2RE and acicular Al2RE. As cooling rate decreased, the content of granular Al2RE increased, while that of other phases decreased. As cooling rate decreased, ultimate tensile strength (UTS), yield strength (YS) and elongation all decreased. When cooling rate was 32.5°C/s, the mechanical properties were the best, and UTS, YS and elongation were 228.2 MPa, 158.2 MPa and 8.8%, respectively.
Funder
Heilongjiang Province Natural Science Foundation
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science