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首页> 外文期刊>Journal of Materials Engineering and Performance >Mechanical Properties and Corrosion Behavior of As-Cast Mg-Zn-Zr-(La) Magnesium Alloys
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Mechanical Properties and Corrosion Behavior of As-Cast Mg-Zn-Zr-(La) Magnesium Alloys

机译：铸造Mg-Zn-Zr-（La）镁合金的机械性能和腐蚀行为

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摘要

The effects of La content on the mechanical properties and corrosion behavior of as-cast Mg-Zn-Zr (ZK) magnesium alloys were investigated. The results showed that La addition to ZK60 alloy resulted in a considerable grain refinement and an increase in the volume fraction of second phases by formation of Mg-Zn-La ternary phase. The tensile tests were performed at both room and elevated temperatures. At room temperature, the yield and tensile strengths and elongation-to-fracture significantly increased with 0.2 wt.% La addition, then deteriorated slightly with increasing La additions above 0.2 wt.%. At 200 A degrees C, the yield and tensile strengths continually improved and elongation-to-fracture decreased with increasing La content due to the presence of thermally stable Mg-Zn-La phase. Immersion and electrochemical corrosion tests revealed that the formation of Mg-Zn-La phases led to a higher amount of cathodic sites and preferential corrosion propagation, and thus a decrease in the corrosion resistance of ZK60 alloys.
机译：研究了La含量对铸造Mg-Zn-Zr（ZK）镁合金的机械性能和腐蚀行为的影响。结果表明，通过形成Mg-Zn-La三阶段，La除了ZK60合金之外的晶粒细化和第二阶段体积分数的增加。在两个房间和升高的温度下进行拉伸试验。在室温下，产率和拉伸强度和伸长率折断明显增加0.2重量％。％La添加，然后略微劣化，随着0.2重量％的La添加。％。在200℃下，由于存在热稳定的Mg-Zn-La相，产率和拉伸强度连续改善，并且随着LA含量的增加而降低。浸渍和电化学腐蚀试验显示Mg-Zn-La相的形成导致较高量的阴极点和优先腐蚀繁殖，从而降低ZK60合金的耐腐蚀性。

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