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EFFECTS OF HIGH TEMPERATURE SHORT TIMEAGEING TREATMENT ON THE MICROSTRUC-TURES AND MECHANICAL PROPERTIES OFMg-3Nd-1Zn ALLOY |
Wenhui WANG1,2,Di WU1(),Rongshi CHEN1,Changsheng LOU2 |
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China |
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Cite this article:
Wenhui WANG,Di WU,Rongshi CHEN,Changsheng LOU. EFFECTS OF HIGH TEMPERATURE SHORT TIMEAGEING TREATMENT ON THE MICROSTRUC-TURES AND MECHANICAL PROPERTIES OFMg-3Nd-1Zn ALLOY. Acta Metall Sin, 2016, 52(5): 567-574.
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Abstract Among the traditional cast magnesium alloys system, Mg-3Nd-1Zn alloy with high strength and heat resistance, has been widely applied in aeronautics such as in engine box and wing rib of airplane. In present research, the as-cast Mg-2.7Nd-0.6Zn-0.5Zr (NZ31) alloy was solution treated and then aged at temperatures ranging from 200 ℃ to 300 ℃. The microstructures and mechanical properties of the aged specimens especially at relatively high temperature (225~300 ℃) were systematically characterized by OM, SEM and TEM. A new kind of precipitates distributed in line was clearly found in the specimens aged at high temperature (225~275 ℃) for a short time (15~30 min), which corresponded to a significant enhancement of hardness and tensile strength at room temperature. The TEM results showed that the precipitates distributed in line had a composition of Mg12Nd and a granular shape, and mainly formed along the (0001)Mg basal plane. The special distribution of the granular Mg12Nd precipitates was effective barriers to the basal slips and may probably restrain the intergranular coordination during tensile deformation, leading to a large strengthening effect, that is, the yield strength and ultimate tensile strength, of the NZ31 alloy aged at 250~275 ℃ for 20~30 min, increased by about 70% and 29% respectively, in comparison with only the solutionized one.
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Received: 26 June 2015
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Fund: Supported by National Natural Science Foundation of China (Nos.51301173 and 51531002) and National Basic Research Program of China (No.2013CB632202) |
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