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首页> 外文期刊>Materials Science and Engineering >Impact of Ce-base mischmetal on the microstructure and mechanical behavior of ZK60 magnesium casting alloys
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Impact of Ce-base mischmetal on the microstructure and mechanical behavior of ZK60 magnesium casting alloys

机译：铈基混合金属对ZK60镁铸造合金的组织和力学行为的影响

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摘要

Magnesium alloys are important alternatives for structural weight reduction due to their low density and good specific mechanical strength. Among the magnesium alloys, the ZK type exhibits the highest mechanical strength. However, it has limitations on hot working or welding owing to the presence of intermetallics with low melting point and consequently susceptibility to hot crack formation. The addition of rare earths tends to form intermetallics with higher melting points, thus inhibiting the formation of hot cracks, as well as building up thin and dense surface films that improve corrosion resistance. This work studies the addition of 1.5% wt. of mischmetal (Mm) to the ZK60 alloy, and then demonstrates the effects of the casting process with mechanical mixing in the semi-solid state. The alloys produced were: ZK60 and ZK60–1.5 wt%Mm manufactured by conventional casting and rheocast ZK60–1.5 wt%Mm produced with mechanical mixing in the semi-solid state. The casting and cooling methods result in defect-free and chemically homogeneous materials, and the mechanical mixing provides a homogeneous microstructure with globular grains. The mechanical strength was though higher for the ZK60 alloy due to its increased solute content within the Mg-matrix and the smaller quantity of intermetallics that builds up an intermittent network. The Mg7Zn3intermetallic, which is the main precipitate for ZK60 alloy, has hardness 20% higher than the MgZn2Ce intermetallic that is precipitated with the mischmetal addition and partly removes solute from the Mg-solid solution.
机译：镁合金由于其低密度和良好的比机械强度而成为减轻结构重量的重要替代品。在镁合金中，ZK型具有最高的机械强度。但是，由于存在熔点低的金属间化合物，因此在热加工或焊接方面存在局限性，因此容易形成热裂纹。稀土元素的添加趋于形成熔点更高的金属间化合物，从而抑制了热裂纹的形成，并形成了薄而致密的表面膜，从而提高了耐腐蚀性。这项工作研究了1.5％wt。将混合金属（Mm）添加到ZK60合金中，然后演示了在半固态状态下机械混合铸造工艺的效果。生产的合金有：通过传统铸造生产的ZK60和ZK60–1.5％wt％Mm，以及通过机械混合以半固态生产的流变铸造的ZK60–1.5％wt％Mm。铸造和冷却方法可产生无缺陷且化学均质的材料，并且机械混合可提供具有球状晶粒的均质微观结构。 ZK60合金的机械强度更高，这是因为ZM60合金中Mg基质中的溶质含量增加，并且金属间化合物的数量较少，从而形成了间歇性网络。 Mg7Zn3金属间化合物是ZK60合金的主要沉淀物，其硬度比通过添加混合金属而沉淀的MgZn2Ce金属间化合物高20％，并且可以部分除去Mg固溶体中的溶质。

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  • 来源
    《Materials Science and Engineering》 |2018年第18期|306-313|共8页
  • 作者

    E.P. Silva; F. Marques; T.S. Nossa; U. Alfaro; H.C. Pinto;

  • 作者单位

    São Carlos School of Engineering (EESC), University of São Paulo (USP), Department of Materials Engineering;

    São Carlos School of Engineering (EESC), University of São Paulo (USP), Department of Materials Engineering;

    Federal Institute of Education, Science and Technology of São Paulo (IFSP), Department of Mechanics;

    German Aerospace Centre (DLR), Institute of Material Research;

    São Carlos School of Engineering (EESC), University of São Paulo (USP), Department of Materials Engineering;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    ZK60; Mischmetal; Casting; Microstructure; Mechanical properties;

    机译：ZK60;杂种金属;铸造;显微组织;力学性能;

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