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《Materials for Mechanical Engineering》 2013-03
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Effects of Y Contents on Microstructure and Mechanical Properties of Heat-Resistant Magnesium Alloy Mg-9Al-2.25Sr

ZHANG Jin-ling1,2,LIU Lu1,WANG Xin1,FAN Jin-ping1,2,WANG She-bin1,2 (1.College of Materials Science and Engineering;2.Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)  
Heat-resistant magnesium alloys Mg-9Al-2.25Sr with different Y contents were prepared in pit type tempering resistance furnace,and effects of Y contents on microstructure and mechanical properties of Mg-9Al-2.25Sr alloys were studied by optical microscopy,scanning electron microscopy,energy diffraction spectroscopy and X-ray diffraction.The results show that Y could refine the microstructure of Mg-9Al-2.25Sr alloys and combine with Al to generate granulate and dispersive Al2Y to restrain low-temperature phase β-Mg17Al12 precipitation.When the mass fraction of Y was 0.35wt%,the alloy had the best mechanical properties with tensile strength and yield strength at room and high temperature(200 ℃) were 207.65,159.77 MPa and 192.52,134.83 MPa,respectively.
【Fund】: 太原理工大学2012年校专项/青年基金(2012L055)
【CateGory Index】: TG146.22
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