Comparative Study on the Microstructure and Mechanical Properties of Mg-Li-Al Based Alloys with Yttrium and Strontium Addition
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第3期
论文作者：许天才 彭晓东 JIANG Junwei XIE Weidong CHEN Yuanfang ZHANG Xi
文章页码：626 - 630
摘 要：The effects of yttrium and strontium on the microstructure and mechanical properties of Mg-11Li-3Al magnesium alloy（LA113） are compared and analyzed. Microstructures and phases of the alloys were studied with optical microscope（OM）, scanning electron microscope（SEM）, X-ray diffractometer（XRD） and energy dispersive spectrometer（EDS）. Mechanical properties of alloys were measured with tensile tester. The results show that yttrium and/or strontium additions produce a strong grain refi ning effect in LA113 alloy. Al2 Y and Al4 Sr, etc. phases with different morphologies are verifi ed and exist inside the grain or at the grain boundaries, which directly impact on the mechanical properties of LA113 alloy. The results of tensile tests show that, the as-extruded LA113-1Y-1Sr alloy obtains the optimal tensile property of which the tensile strength and elongation are 253.56 MPa and 18.12%, the tensile strength is increased by almost 25% compared with the asextruded LA113 alloy.
许天才1，彭晓东1,2，JIANG Junwei1，XIE Weidong1,2，CHEN Yuanfang1,3，ZHANG Xi1
1. College of Materials Science and Engineering, Chongqing University2. National Engineering Research Center for Magnesium Alloys3. College of Materials Science and Engineering, Chongqing University of Technology
摘 要：The effects of yttrium and strontium on the microstructure and mechanical properties of Mg-11Li-3Al magnesium alloy（LA113） are compared and analyzed. Microstructures and phases of the alloys were studied with optical microscope（OM）, scanning electron microscope（SEM）, X-ray diffractometer（XRD） and energy dispersive spectrometer（EDS）. Mechanical properties of alloys were measured with tensile tester. The results show that yttrium and/or strontium additions produce a strong grain refi ning effect in LA113 alloy. Al2 Y and Al4 Sr, etc. phases with different morphologies are verifi ed and exist inside the grain or at the grain boundaries, which directly impact on the mechanical properties of LA113 alloy. The results of tensile tests show that, the as-extruded LA113-1Y-1Sr alloy obtains the optimal tensile property of which the tensile strength and elongation are 253.56 MPa and 18.12%, the tensile strength is increased by almost 25% compared with the asextruded LA113 alloy.
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