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首页> 外文期刊>Journal of Materials Engineering and Performance >Ca Addition Effects on the Microstructure, Tensile and Corrosion Properties of Mg Matrix Alloy Containing 8 wt.% Mg2Si
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Ca Addition Effects on the Microstructure, Tensile and Corrosion Properties of Mg Matrix Alloy Containing 8 wt.% Mg2Si

机译：CA添加对含有8wt％的Mg基质合金的微观结构，拉伸和腐蚀性能。％Mg2Si

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The microstructure, tensile properties and corrosion behavior of the Mg-8 wt.% Mg2Si-x%Ca alloy have been studied by the use of optical microscopy, scanning electron microscopy equipped with energy-dispersive spectroscopy, x-ray diffraction, standard tensile testing, polarization test and electrochemical impedance spectroscopy (EIS) measurements. Microstructural studies indicated that Ca modifies both primary and eutectic Mg2Si phase. It was found that the average size of primary Mg2Si particles is about 60 mu m, which is dropped by about 82% in the alloy containing 0.05 wt.% Ca. By the addition of different Ca contents, Ca-rich intermetallics (i.e., CaSi2 and CaMgSi) were formed. The modification mechanism of adding Ca during solidification was found to be due to the strong effect of CaMgSi phase as a heterogonous nucleation site, apart from CaSi2 which was reported before, for Mg2Si intermetallics. Tensile testing results ascertained that Ca addition enhances both ultimate tensile strength (UTS) and elongation values. The optimum amount of Ca was found to be 0.1 wt.%, which improved UTS and elongation values from about 130 MPa and 2% to 165 MPa and 5.5%, whereas more Ca addition (i.e., 3 wt.%) reduced the tensile properties of the alloy to about 105 MPa and 1.8%, which can be due to the formation of CaMgSi intermetallics with deteriorating needle-like morphology. Polarization and EIS tests also showed that the Mg-3%Si-0.5%Ca alloy pronounces as the best anti-corrosion alloy. Nevertheless, further added Ca (up to 3 wt.%) deteriorated the corrosion resistance due to predominance of worse galvanic coupling effect stemmed from the presence of stronger CaMgSi cathode in comparison with Mg2Si. With higher Ca additions, an adverse effect was seen on corrosion resistance of the Mg-3%Si alloy, as a result of forming a weak film on the alloy specimen surface.
机译：Mg-8重量％的微观结构，拉伸性能和腐蚀行为。通过使用光学显微镜研究了％Mg2Si-X％Ca合金，扫描电子显微镜，扫描电子显微镜，X射线衍射，标准拉伸试验，偏振试验和电化学阻抗光谱（EIS）测量。微观结构研究表明，CA改变了初级和共晶Mg2SI相。发现初级Mg2Si颗粒的平均尺寸约为60μm，其在含有0.05重量％的合金中掉下约82％。通过添加不同的Ca内容物，形成了Ca-Rich Meterallics（即Casi2和Camgsi）。发现在凝固过程中添加Ca的改性机制是由于CAMGSI相对于异核成核位点的强烈效果，除了以前报道的CASI2，对于MG2SI金属间金属间化合物。拉伸测试结果确定了CA添加增强了极限拉伸强度（UT）和伸长率值。发现最佳Ca量为0.1重量％。％，从约130MPa和2％至165MPa和5.5％改善UT和伸长值，而更多Ca加成（即，3重量％）降低拉伸性能合金至约105MPa和1.8％，这可能是由于形成Camgsi金属间金属间质，以恶化针状形态。偏振和EIS测试还显示Mg-3％Si-0.5％Ca合金发音为最佳的防腐蚀合金。然而，进一步添加的Ca（最多3重量％）劣化，由于与Mg2Si相比，由于较强的CAMGSI阴极的存在而导致的耐腐蚀性。由于Ca添加更高，因此在合金标本表面上形成弱薄膜，在Mg-3％Si合金的耐腐蚀性上观察到不利影响。

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