Influence of cryogenic treatment on room and low temperature tensile behavior of as-cast Mg-10Gd-3Y-0.5Zr magnesium allo
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Liua) National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; and Shanghai Light Alloy Net Forming National Engineering Research Center Co., Ltd., Shanghai 201615, China
Guohua Wu, H.R. Jafari Nodooshan, Xuefeng Zhang, and Song Zhang National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Kehua Zhou Science and Technology on Space Physics Laboratory, Beijing 100076, China
Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China (Received 7 June 2015; accepted 14 January 2016)
In this study, the temperature gradient on lunar surface was simulated by deep cryogenic treatment and cryogenic thermocycling. The influence of these treatments on room and low temperature tensile properties and fracture behavior of the as-cast Mg–10Gd–3Y–0.5Zr alloy was then investigated. The results have shown that the cryogenic treatments caused the precipitation of Mg24(Gd, Y)5 phase and improved the ductility of the alloy. The deep cryogenic treatment almost has no influence on the tensile properties of the alloy, while the cryogenic thermocycling slightly improve its tensile properties at room temperature and slightly deteriorate the ultimate tensile strength of the alloy at low temperature. The cleavage fracture is the main fracture mechanism at both room and low temperatures. To conclude, this alloy can withstand the huge temperature gradient on the lunar surface and shows application perspective.
I. INTRODUCTION
The increasing demand for reducing weight for aerospace applications has been the motivation for many research programs concerning lightweight alternatives to conventional aerospace materials such as aluminum and titanium alloys. Due to the unique properties such as low density, high specific strength, high specific stiffness, and excellent castability, magnesium alloy is becoming the ideal lightweight structural material applied widely in the field of aerospace.1,2 Researchers found that adding rare earth elements (RE) is an effective way to improve the mechanical properties of magnesium alloy.3,4 The main strengthening mechanism of Mg–RE alloy is precipitation hardening which endows the series of alloys with higher mechanical properties than the traditional Mg–Al
Contributing Editor: Yang-T. Cheng a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.38 J. Mater. Res., Vol. 31, No. 4, Feb 29, 2016
alloys, e.g., AZ91D or AZ31B. Among those Mg–RE alloys, Mg–Gd–Y alloy is a newly developed magnesium alloy with high mechanical properties both at room and elevated temperature, which demonstrates the potent
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