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Effects of Zn/Al mass ratio on microstructure evolution and mechanical properties of Mg-Sn based alloys

机译：Zn / Al质量比对Mg-Sn基合金微观结构演化和力学性能的影响

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摘要

Effects of Zn/Al mass ratio on the microstructure evolution and mechanical properties of the Mg-3Sn-5Zn-xAl (x=0,1,2,3 wt%) alloy were systematically investigated in the present study. The secondary phases of as-cast alloys were transformed from MgZn_2/α-Mg eutectics and Mg_2Sn to icosahedral (I-) phase and Mg_2Sn with decreasing of Zn/Al mass ratio. After extrusion, almost completely recrystallized fine grains were obtained in TZ35-xAl alloys, but the volume fraction of recrystallized region was slightly reduced by the addition of Al. This phenomenon was chiefly ascribed to the particle-stimulated nucleation (PSN) mechanism and Zener grain-boundary pinning effect induced by enormous numbers of fine Mg-Zn phase, I-phase, Mg_2Sn and newly formed Φ-phase (related to I-phase) particles. As-extruded alloys exhibited superior strength and ductility balance. Specifically, Mg-3Sn-5Zn-1Al alloy got the highest ultimate tensile strength and elongation, reaching 340 MPa and 20.1%, respectively. Moreover, tensile yield strength of as-extruded alloys rises dramatically from 169 MPa to 212 MPa along with rising of the Al level. Improved tensile yield strength is primarily attributed to the synergistic reinforcement mechanism of grain refinement and dynamic precipitation of fine secondary particles. The excellent ductility for all as-extruded alloys owes a great deal to the activation of non-basal slip systems, high volume fraction of fine DRXed grains and weakened texture.
机译：本研究系统地研究了Zn / Al质量比对Mg-3Sn-5Zn-Xal（X = 0.1,2,3wt％）合金的微观结构演化和力学性能的影响。通过降低Zn / Al质量比从MgZN_2 /α-Mg Eutectics和Mg_2SN转化为铸造合金的二次相。在挤出后，在TZ35-Xal合金中获得几乎完全重结晶的细粒，但通过加入A1，重结晶区域的体积分数略微降低。这种现象主要归因于通过巨大数量的细mg-Zn相，I相，Mg_2Sn和新形成的φ相诱导的颗粒刺激的成核（PSN）机制和齐纳晶界钉扎效果（与I相有关） 粒子。挤出合金具有优异的强度和延展性平衡。具体地，Mg-3Sn-5Zn-1Al合金具有最高的极限拉伸强度和伸长率，分别达到340MPa和20.1％。此外，用挤出合金的拉伸屈服强度从169MPa到212MPa随着Al水平的上升而大幅上升。改进的拉伸屈服强度主要归因于晶粒细化的协同增强机制和细次级粒子的动态沉淀。所有挤出合金的优异延展性归功于非基础滑移系统的激活，细小的颗粒的高体积分数和弱化纹理。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|141307.1-141307.13|共13页
  • 作者

    Yuxiao Luo; Yuan Chen; Lei Ran; Xu Pang; Fusheng Pan;

  • 作者单位

    College of Materials Science and Engineering Chongqing University Chongqing 400044 China;

    College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China;

    College of Materials Science and Engineering Chongqing University Chongqing 400044 China;

    College of Materials Science and Engineering Chongqing University Chongqing 400044 China;

    College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China;

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  • 正文语种 eng
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  • 关键词

    Mg-Sn-Zn-Al alloys; Microstructure evolution; Ⅰ-phase; Dynamic recrystallization; Mechanical properties;

    机译：Mg-Sn-Zn-Al合金;微观结构演变;Ⅰ-阶段;动态再结晶;机械性能;

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