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Mg-8.07Al-0.53Zn-1.36Nd镁合金微观组织及裂纹演变行为研究
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内蒙古工业大学,内蒙古工业大学,内蒙古工业大学,内蒙古工业大学,内蒙古工业大学,内蒙古工业大学

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内蒙古自治区自然科学(2015MS0526);国家自然科学(11362014);高等学校博士学科点专项科研基金(博导类)(20131514110004)


Study on Microstructure and Crack Evolution Behavior of Mg-8.07Al-0.53Zn-1.36Nd Magnesium Alloy
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Inner Mongolia University of Technolog,,,,,

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    摘要:

    利用XRD、SEM、TEM、EDS等测试方法对Mg-8.07Al-0.53Zn-1.36Nd镁合金微观组织结构进行了表征与分析,并采用原位拉伸试验研究了合金显微组织对裂纹萌生及扩展行为的影响。研究结果表明:试验合金组织中主要包括α-Mg基体,β-Mg17Al12,α β共晶相,Al11Nd3针状相和Al2Nd颗粒相。Al2Nd存在孪晶结构,孪晶面为{11-1},Al11Nd3存在连续的凹凸界面结构。合金室温原位拉伸试验结果显示:裂纹主要在粗大的β-Mg17Al12相内部萌生,裂纹扩展方式包括沿晶扩展和穿晶扩展方式。裂纹穿晶扩展主要归因于沿晶界分布的Al11Nd3、Al2Nd相与周围组织界面结合能力较强,Al11Nd3凹凸界面对基体与共晶组织的啮合作用显著。

    Abstract:

    The microstructure of Mg-8.07Al-0.53Zn-1.36Nd magnesium alloy was characterized and analysed by using XRD, SEM, TEM and EDS. The effect of microstructure on the behavior of crack initiation and propagation was investigated by in situ tensile testing. Results show that the microstructure consists of α-Mg matrix, β-Mg17Al12, eutectic phase α β, needle-like Al11Nd3 and particle Al2Nd phase while the 1.36 wt.%Nd added in AZ91 alloy. The twin structure of the Al2Nd phase was observed, and the twin plane is {11-1}. Moreover, a continuous concave and convex interface structure of the Al11Nd3 has been found. In situ tensile testing of the alloy at room temperature shows that the crack initiation mainly occured in the β-Mg17Al12phase, and the crack propagation modes includes of intergranular and transgranular expansion. Crack transgranular expansion is due to the strong binding ability between of Al11Nd3 or Al2Nd phases and surrounding organization, and the continuous concave and convex interface structure of the Al11Nd3 provides a significant meshing effect on the matrix and eutectic structure.

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崔晓明,白朴存,刘飞,候小虎,张晓婷,杜赵新. Mg-8.07Al-0.53Zn-1.36Nd镁合金微观组织及裂纹演变行为研究[J].稀有金属材料与工程,2017,46(3):728~734.[Cui Xiaoming, Bai Pucun, Liu Fei, Hou Xiaohu, Zhang Xiaoting, Du Zhaoxin. Study on Microstructure and Crack Evolution Behavior of Mg-8.07Al-0.53Zn-1.36Nd Magnesium Alloy[J]. Rare Metal Materials and Engineering,2017,46(3):728~734.]
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  • 收稿日期:2016-06-28
  • 最后修改日期:2016-08-13
  • 录用日期:2016-09-29
  • 在线发布日期: 2017-05-18
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