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刘希琴

副教授

学历:上海医科大学

学位:医学硕士学位

所在单位:材料科学与技术学院

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The microstructure and mechanical properties of as-cast Mg-4Y/Nd-2Zn alloys

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所属单位:材料科学与技术学院

发表刊物:MATERIALS SCIENCE AND TECHNOLOGY

关键字:Mg-4Y/Nd-2Zn alloys Xphase W phase microstructure mechanical properties

摘要:Optical microscopy, scanning electron microscopy, X-ray diffraction and tensile testing were performed to investigate the microstructure and mechanical properties of as-cast Mg-4Y/Nd-2Zn alloys. The results show that the secondary dendritic arm spacing for the Mg-4Y-2Zn alloy is smaller than that for the Mg-4Nd-2Zn alloy, and that X-Mg12YZn or W-Mg3Zn3Nd2 form in Mg-4Y/Nd-2Zn alloys. The lamellar X phase distributes at the grain boundary, pointing into the grains, whereas the rod-like W phase preferentially segregates at the triangle junction of the grain boundary. The greater grain boundary strengthening effect and the smaller fragmentation effect of the brittle eutectic phases leads to the as-cast Mg-4Y-2Zn alloy having better comprehensive mechanical properties. The fracture mechanism for as-cast Mg-4Y/Nd-2Zn alloys is quasi-cleavage fracture.

ISSN号:0267-0836

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发表时间:2018-01-01

合写作者:刘洋,刘子利,刘国栋,范汝友,尹涵,李健

通讯作者:刘希琴

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