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| Effects of Precipitates on Compression Behavior of Mg-Gd-Y-Nd-Zr Alloy at Ambient Temperature |
| TANG Changping1,2, LI Guodong3, LIU Wenhui1,2, CHEN Yuqiang1,2, LIU Xiao1,2, LI Fangwei1,2
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1 School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201;
2 High Temperature Wear Resistant Materials and Preparation Technology of Hunan Province National Defence Science and Technology Laboratory, Xiangtan 411201;
3 Equipment Management Department, Suzhou Nuclear Power Research Institute Company Limited, Shenzhen 518124 |
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Abstract Effects of precipitates on compression behavior of Mg-5.5Gd-3.0Y-1.0Nd-1.0Zr at ambient temperature were investigated by optical microscopy (OM), hardness testing, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and ambient temperature compression test. The results indicated that the compression property of the alloy was very excellent. After 225 ℃/12 h treated, the compressive strength of the alloy could achieve 490 MPa, the yield strength could achieve 325 MPa, and the total compressive strain could reach 8.9%. The excellent compressive strength was attributed to the β′ precipitate, which was semi-coherent with the magnesium matrix. The alloy became overage as the aging time prolonged. The micrometer scaled equilibrium β phase precipitated from the matrix after aged at 300 ℃ for 8 h. The precipitate free zone with width of about 2 μm was formed at the grain boundary, which weakened the strengthening effect. The fracture analysis indicated that cleavage fracture was the main fracture mode, and the cleavage planes were connected by a small amount of dimples.
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Published: 25 August 2017
Online: 2018-05-07
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2017, Vol. 31 
