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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Selection of promising quaternary candidates from Mg-Mn-(Sc, Gd, Y, Zr) for development of creep-resistant magnesium alloys
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Selection of promising quaternary candidates from Mg-Mn-(Sc, Gd, Y, Zr) for development of creep-resistant magnesium alloys

机译：从Mg-Mn-（Sc，Gd，Y，Zr）中选择有前途的四元候选物用于开发抗蠕变镁合金

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摘要

Recently developed Mg-Mn-Sc alloys show a considerable increase of creep resistance at elevated temperature. The endeavor to further improve the properties and to reduce cost of high-price Sc metal initiated a search for additional alloying elements. Gd, Y and Zr were considered for this purpose. The aim is to achieve a large quantity of suitable precipitations to improve mechanical properties using a minimum of expensive alloy element addition. The huge amount of possibilities of combining the elements Mg-Mn-(Sc, Gd, Y Zr) and the time and cost effort of technological experiments require a preselecting of systems and alloy compositions. Thermodynamic phase diagram and phase amount calculations were performed to give hints for selecting promising candidates. A priority list of three quaternary systems is established: Mg-Mn-Gd-Sc, Mg-Mn-Sc-Y and Mg-Mn-Y-Zr, based on the classification of individual alloys. Most promising is MgMn1Gd5Sc0.8 (wt.percent), but the alloys MgMn1Gd5Sc0.3 and MgMn1Y5Sc0.8 are also promising. The entire quaternary Mg-Mn-Y-Zr system is disqualified because of phase diagram features that are detrimental for the required microstructural engineering. The focused alloy development following this approach avoids a waste of time and effort.
机译：最近开发的Mg-Mn-Sc合金在高温下显示出显着的抗蠕变性。为了进一步改善性能并降低高价Sc金属的成本，人们开始寻求其他合金元素。为此考虑了Gd，Y和Zr。目的是使用最少的昂贵合金元素添加物来获得大量合适的析出物，以改善机械性能。结合元素Mg-Mn-（Sc，Gd，Y Zr）的巨大可能性以及技术实验的时间和成本，都需要预先选择系统和合金成分。进行了热力学相图和相量计算，为选择有前途的候选物提供了提示。根据各个合金的分类，建立了三个四元体系的优先级列表：Mg-Mn-Gd-Sc，Mg-Mn-Sc-Y和Mg-Mn-Y-Zr。最有前途的是MgMn1Gd5Sc0.8（wt。％），但是合金MgMn1Gd5Sc0.3和MgMn1Y5Sc0.8也很有前途。整个四元Mg-Mn-Y-Zr系统不合格，因为相图特征不利于所需的微结构工程。采用这种方法进行有针对性的合金开发可以避免浪费时间和精力。

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