| Hot Tearing Behavior of Mg-Gd-Y-X Alloys |
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| 作者姓名： | LIAO Jinge LI Chengxing ZOU Wenbing KANG Jing SONG Jiangfeng JIANG Bin ZHAO Hu YANG Zhiyuan PAN Fusheng |
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| 作者单位： | National Engineering Research Center for Magnesium Alloy， Chongqing University， Chongqing 400044， China;Shanghai Spaceflight Precision Machinery Institute， Shanghai 201600， China;National Engineering Research Center for Magnesium Alloy， Chongqing University， Chongqing 400044， China;State Key Laboratory of Mechanical Transmissions， College of Materials Science and Engineering， Chongqing University， Chongqing 400044， China |
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| 摘 要： | Mg-Gd-Y-Zr alloy castings are widely used in the aerospace field owing to their high strength and excellent creep resistance. The castability of these alloys is also an important consideration for engineering application. Thus， the hot tearing susceptibilities (HTSs) of Mg-10Gd-1Y-1Zn-0.5Zr (VW91) alloy and Mg-10Gd-2Y-1Zn-0.5Zr (VW92) alloy are investigated with a constrained rod casting (CRC) mold. The microstructures and fracture surface are characterized by optical microscope and scanning electron microscope. The results unveil that the HTS of VW92 alloy is lower than that of VW91 alloy. The microstructures indicate that obvious tears can be observed in VW91 alloy， while the tears in VW92 alloy are tiny. The tear feeding and healing by eutectic are also observed in VW91 and VW92 alloys. Therefore， the lower hot tearing susceptibility of VW92 alloy is mainly attributed to the high amount of eutectic which feeds and heals tears. Besides， the effects of the coefficient of thermal expansion (CTE) and the fluidity of VW91 and VW92 alloys on their HTSs are discussed.
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| 关 键 词： | VW91 alloy VW92 alloy hot tearing susceptibility (HTS) fluidity coefficient of thermal expansion (CTE) eutectic |
Hot Tearing Behavior of Mg-Gd-Y-X Alloys |
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| LIAO Jinge,LI Chengxing,ZOU Wenbing,KANG Jing,SONG Jiangfeng,JIANG Bin,ZHAO Hu,YANG Zhiyuan,PAN Fusheng.Hot Tearing Behavior of Mg-Gd-Y-X Alloys[J].Aerospace Shanghai,2022,39(1):92-101. |
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| Authors: | LIAO Jinge LI Chengxing ZOU Wenbing KANG Jing SONG Jiangfeng JIANG Bin ZHAO Hu YANG Zhiyuan PAN Fusheng |
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| Abstract: | |
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| Keywords: | VW91 alloy VW92 alloy hot tearing susceptibility (HTS) fluidity coefficient of thermal expansion (CTE) eutectic |
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