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Mechanical and damping properties of thermal treated Mg-Zn-Y-Zr alloys reinforced with quasicrystal phase

机译:准晶相增强Mg-Zn-Y-Zr热处理合金的力学性能和阻尼性能

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摘要

The effects of annealing, T4 and T6 heat treatment on microstructure, mechanical properties and damping capacities of a quasicrystal-reinforced Mg-Zn-Y-Zr alloy (the ZWK3 alloy) were investigated in this study. The structural results show that the Mg_(0.97)Zn_(0.03) phase could transform to Mg_7Zn_3 phase during annealing and only primary phase and the I-Mg_3YZn_6 quasicrystal phase exist in the T4 treated ZWK3 alloy. Further aging in T6 treatment precipitates a large amount of nanoscaled MgZn_2 phase. The thermal treatment could improve the tensile strength of the ZWK3 alloy greatly, while a large reduction in elongation and high strain amplitude damping are obtained compared with that of the as-cast alloy. In spite of this, the damping values of three heat treated ZWK3 alloys all exceed 0.01, representing our studied alloys still belong to high damping magnesium alloys. Decrease of mobility of dislocations, resulting from tanglement and pinning, is responsible for damping decline. We also find that twins only observed in the T6 treated ZWK3 alloy could produce new damping sources besides dislocation.
机译:研究了退火,T4和T6热处理对准晶增强Mg-Zn-Y-Zr合金(ZWK3合金)的组织,力学性能和阻尼能力的影响。结构结果表明,在退火过程中,Mg_(0.97)Zn_(0.03)相可以转变为Mg_7Zn_3相,并且在T4处理的ZWK3合金中仅存在初生相和I-Mg_3YZn_6准晶相。 T6处理中的进一步老化会沉淀出大量的纳米级MgZn_2相。热处理可以显着提高ZWK3合金的抗拉强度,而与铸态合金相比,可以大大降低延伸率并实现高应变幅度阻尼。尽管如此,三种热处理过的ZWK3合金的阻尼值均超过0.01,这表示我们研究的合金仍属于高阻尼镁合金。纠缠和钉扎导致的位错迁移率降低是造成阻尼下降的原因。我们还发现,只有在经T6处理的ZWK3合金中观察到的孪晶,才能产生位错以外的新阻尼源。

著录项

  • 来源
    《Materials Science and Engineering》 |2014年第25期|11-18|共8页
  • 作者单位

    State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;

    State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;

    State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;

    School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK;

    Department of Material Science and Engineering, University of Florida, Gainesville, FL 32611, USA;

    State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;

    State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;

    State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Magnesium alloy; Quasicrystal; Mechanical property; Damping capacity; Dislocation; Twin;

    机译:镁合金准晶体机械性能阻尼能力错位;双胞胎;

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