Effect of yttrium additions on the properties of grain-refined Mg-3%Nd alloy
Effect of yttrium additions on the properties of grain-refined Mg-3%Nd alloy
复制标题
DOI：
10.1007/s10853-008-2708-9
复制
发表时间：
2008-07-01
影响因子：
4.5
通讯作者：
Bronfin, Boris
中科院分区：
文献类型：
--
作者：
Aghion, Eli;Gueta, Yael;Bronfin, Boris
进行了系统的研究，以评估高达2.5%的钇添加量对指定用于高温重力铸造应用的Mg-3%Nd合金的性能的影响。所有测试的合金都被锆细化晶粒。结果表明，钇的加入显著提高了拉伸屈服强度、疲劳强度和抗蠕变性，但降低了塑性。而其他性能如抗拉强度和耐5%NaCl溶液腐蚀性能几乎没有影响。钇的加入所获得的强化效果解释在固溶强化方面，由于形成的三元相Mg-Nd-Y。提高抗蠕变性是由于钇在固溶体镁基体中的大溶解度和由三元相产生的有效蠕变变形屏障。测试合金在流动性方面的铸造性能是相似的，钇没有明显的影响。
A systematic study was carried out to evaluate the effect of up to 2.5% yttrium additions on the properties of Mg-3%Nd alloy designated for high-temperature gravity casting applications. All the tested alloys were grain-refined by zirconium. The results show that additions of yttrium significantly improved the tensile yield strength, fatigue strength, and creep resistance while reducing the ductility. However, other properties such as the ultimate tensile strength and corrosion resistance in 5% NaCl solution were nearly not affected. The strengthening effect obtained by the yttrium additions is explained in terms of solid-solution strengthening and due to formation of a ternary phase of Mg-Nd-Y. The improved creep resistance was due to the large solubility of yttrium in solid-solution magnesium matrix and to the effective creep deformation barriers created by the ternary phase. The casting performance of the tested alloys in terms of fluidity was similar and no significant effect of the yttrium was evident.