Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 706, Issue -, Pages 526-537Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.02.269
Keywords
Mg-4Sm-3Nd-Zr; Gd; ZrZn phase; Microstructure; Mechanical property
Categories
Funding
- National Natural Science Foundation of China [51401200, 51575231]
- Natural Science Foundation of Jilin Province [20140520099JH, 20160101288JC]
- Science & Technology Pillar Program of Qinghai Province [2014-GX-216A]
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The effect of gadolinium (Gd, 1 wt%) and zinc (Zn, 1 wt%) additions on microstructures and mechanical properties of Mg-4Sm-3Nd-Zr alloy have been investigated by optical microscopy, scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The additions of Gd and Zn changed the kinds of precipitates in the T6-state alloy, leading to improvement of tensile properties. The prismatic precipitated phases beta' and beta existed in the peak-aged Mg-4Sm-3Nd-Zr alloy, while beta' phase and gamma phase were dominant precipitates in peak-aged Mg-4Sm-3Nd-Gd-Zn-Zr alloy, and the strip-shaped ZrZn phase could also be observed after solution treatment at 798 K for 8 h. The peak-aged Mg-4Sm-3Nd-Gd-Zn-Zr alloy exhibited good heat resistance with ultimate tensile properties 213 MPa and elongation 8.6% at 573 K, which was attributed to beta' phase, g phase and ZrZn phase hindering dislocation and grain boundary motions. (C) 2017 Elsevier B. V. All rights reserved.
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