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Effects of Zn content on the microstructure and the mechanical and corrosion properties of as-cast low-alloyed Mg-Zn-Ca alloys

机译:Zn含量对铸造低合金Mg-Zn-Ca合金微观结构及机械和腐蚀性能的影响

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The effects of Zn content on the microstructure and the mechanical and corrosion properties of as-cast low-alloyed Mg-xZn-0.2Ca alloys (x = 0.6wt%, 2.0wt%, 2.5wt%, hereafter denoted as 0.6Zn, 2.0Zn, and 2.5Zn alloys, respectively) are investigated. The results show that the Zn content not only influences grain refinement but also induces different phase precipitation behaviors. The as-cast microstructure of the 0.6Zn alloy is composed of alpha-Mg, Mg2Ca, and Ca2Mg6Zn3 phases, whereas 2.0Zn and 2.5Zn alloys only contain alpha-Mg and Ca2Mg6Zn3 phases, as revealed by X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses. Moreover, with increasing Zn content, both the ultimate tensile strength (UTS) and the elongation to fracture first increase and then decrease. Among the three investigated alloys, the largest UTS (178 MPa) and the highest elongation to fracture (6.5%) are obtained for the 2.0Zn alloy. In addition, the corrosion rate increases with increasing Zn content. This paper provides an updated investigation of the alloy composition-microstructure-property relationships of different Zn-containing Mg-Zn-Ca alloys.
机译:Zn含量对铸造低合金Mg-XZN-0.2Ca合金微观结构和机械和腐蚀性能的影响(x = 0.6wt%,2.0wt%,2.5wt%,以下表示为0.6zn,2.0研究了Zn和2.5Zn合金)。结果表明,Zn含量不仅影响晶粒细化,还影响不同的相降沉淀行为。 0.6Zn合金的铸造微结构由α-Mg,Mg2Ca和Ca2mg6zN3相组成,而2.0Zn和2.5Zn合金仅含有α-Mg和Ca2mg6Zn3相,如X射线衍射(XRD)透露透射电子显微镜(TEM)分析。此外,随着Zn含量的增加,最终拉伸强度(UTS)和伸长率至裂缝首先增加,然后减少。在三种调查的合金中,对于2.0 Zn合金,获得最大的UTS(178MPa)和裂缝(6.5%)的最高伸长率。此外,随着Zn内容的增加,腐蚀速率增加。本文提供了对含有不同Zn的Mg-Zn-Ca合金的合金组合物 - 微观结构 - 性能关系的更新研究。

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