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首页> 外文期刊>Materials Science and Engineering >Synergic effects of Gd and Y contents on the age-hardening response and elevated-temperature mechanical properties of extruded Mg-Gd(-Y)-Zn-Mn alloys
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Synergic effects of Gd and Y contents on the age-hardening response and elevated-temperature mechanical properties of extruded Mg-Gd(-Y)-Zn-Mn alloys

机译：Gd和Y含量对挤出Mg-Gd（-Y）-Zn-Mn合金升高升温力学性能的协同作用

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摘要

This paper investigated the effects of Gd and Y solutes on aging behaviour and corresponding mechanical properties of the extruded Mg-Gd(-Y)-Zn-Mn alloys at room and elevated temperatures. The results show that aging treatment provided significant improvement of ～100 MPa in strength by forming ellipsoidal β' nanophases in the as-extruded alloys. Partially substituting Y for Gd in the as-extruded Mg-Gd-Zn-Mn alloys can delay age-hardening response, but improve the strength increment after aging treatment. As the Y/Gd atomic ratio changed from 0 to 1, the Mg-1.75Gd-0.75Y-0.5Zn-Mn(at.%) alloy with a Y/Gd atomic ratio of 0.4 obtained the higher peak-hardness and mechanical properties. Enhanced age-hardening response and better mechanical properties were detected after separate additions of Y and Gd. The extruded-T5 Mg-2.5Gd-0.75Y-0.5Zn-0.3Mn alloy exhibited superior ultimate tensile strengths of 520 MPa at room temperature, 344 MPa at 250 °C, and 225 MPa at 300 °C. Fracture behaviours reveal that a change in predominant deformation mechanism from one based on dislocations to one mediated by grain boundary (GB) processes was found as the tensile temperatures arise from 250 °C to 300 °C. The activation of GB sliding of the fine grains partially resulted in the decrease of tensile strength at 300 °C.
机译：本文研究了Gd和Y溶解于室内挤出的Mg-Gd（-Y）-Zn-Mn合金的老化行为和相应的力学性能的影响。结果表明，通过在挤出合金中形成椭圆形β'纳米酶，老化处理提供了显着改善〜100MPa的强度。在用挤出的Mg-Gd-Zn-Mn合金中部分地代替Gd，可以延迟硬化响应的年龄硬化反应，但是在治疗后改善强度增量。随着y / gd原子比从0变为1，Mg-1.75gd-0.75Y-0.5×0.5×0.5×Mn（at。％）合金的Y / Gd原子比为0.4获得较高的峰 - 硬度和机械性能。在单独添加Y和Gd后检测到增强的年龄 - 硬化响应和更好的机械性能。挤出-T5mg-2.5GD-0.75Y-0.5ZN-0.3MN合金在室温下在室温下在250℃下为520MPa，325MPa在300℃下表现出优异的极高拉伸强度。裂缝行为表明，基于脱位对由晶界（GB）介导的一种脱位的偏移量的偏移变形机制的变化被发现，因为拉伸温度从250℃至300℃产生。细粒的GB滑动的激活部分导致拉伸强度在300℃下降低。

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  • 来源
    《Materials Science and Engineering》 |2021年第8期|141019.1-141019.12|共12页
  • 作者

    Ning Su; Yujuan Wu; Qingchen Deng; Zhiyu Chang; Qianye Wu; Yanting Xue; Kun Yang; Qiang Chen; Liming Peng;

  • 作者单位

    National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Mechanical Engineering Kyushu University Fukuoka 819-0395 Japan;

    National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    Department of Mechanical Engineering Kyushu University Fukuoka 819-0395 Japan;

    Department of Mechanical Engineering Kyushu University Fukuoka 819-0395 Japan;

    National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China;

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  • 关键词

    Mg-Gd(-Y)-Zn-Mn alloy; Microstructure; Precipitation hardening; High temperature; Mechanical properties;

    机译：Mg-Gd（-Y）-Zn-Mn合金;微观结构;沉淀硬化;高温;机械性能;

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