Effects of Gd and Zr additions on the microstructures and high-temperature mechanical behavior of Mg–Gd–Y–Zr magnesium alloys in the product form of a large structural casting
Effects of Gd and Zr additions on the microstructures and high-temperature mechanical behavior of Mg–Gd–Y–Zr magnesium alloys in the product form of a large structural casting
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DOI：
10.1557/jmr.2015.306
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发表时间：
2015-11
影响因子：
2.7
通讯作者：
Yanlei Li;Guohua Wu;Antao Chen;H. J. Nodooshan;Wencai Liu;Ying-xin Wang;W. Ding
中科院分区：
文献类型：
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作者：
Yanlei Li;Guohua Wu;Antao Chen;H. J. Nodooshan;Wencai Liu;Ying-xin Wang;W. Ding
研究了不同Gd、Zr含量Mg-Gd-Y-Zr合金低压铸造件的显微组织、高温力学性能和断裂行为。在25-300℃范围内测量了极限抗拉强度（UTS）、抗拉屈服强度和总伸长率（EL）。在相同温度下，经T6处理的Mg - x Gd - 3y - 0.5 zr合金的UTS和屈服强度（YS）随着Gd含量从9%增加到11%而增加，这是由于析出强化的改善。当Zr含量从0.3增加到0.5%时，经T6处理的Mg-10Gd-3Y - y Zr合金晶粒尺寸明显减小，拉伸性能得到改善，这被认为是晶界强化所致。随着拉伸温度的升高，经T6处理的Mg - x Gd-3Y - y Zr合金的UTS和YS均呈现先升高后降低的趋势。β′相是实验合金中重要的强化源，特别是在高温下。Mg-10Gd-3Y-0.5Zr合金在25-300℃范围内表现出良好的强度和EL组合。
The microstructures, high-temperature mechanical properties, and fracture behavior of Mg–Gd–Y–Zr alloy components produced by low-pressure sand casting with different Gd and Zr contents, have been investigated. The ultimate tensile strength (UTS), tensile yield strength, and total elongation (EL) were measured within the 25–300 °C range. At the same temperatures, the UTS and yield strength (YS) of the T6 treated Mg– x Gd–3Y–0.5Zr alloys increased with Gd content increasing from 9 to 11%, which was attributed to the improvement of precipitation strengthening. Increasing the Zr content from 0.3 to 0.5% leads to dramatic decrease in grain size and improved tensile properties of T6 treated Mg–10Gd–3Y– y Zr alloys which is considered to be due to grain-boundary strengthening. With the increase of tensile temperature, both UTS and YS of the T6 treated Mg– x Gd–3Y– y Zr alloys initially increase and then decrease. The β′ precipitates provide important strengthening sources in experimental alloys, especially at elevated temperatures. The Mg–10Gd–3Y–0.5Zr alloy shows good combination of strength and EL within the 25–300 °C range.