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稀土Y对AlSi7Cu2Mg合金高温性能的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-21
利用高温拉伸力学性能测试仪、扫描电镜(SEM)和DTA等测试分析手段，研究不同含量Y对AlSi7Cu2Mg合金的高温力学性能的影响。
稀土Y对AlSi7Cu2Mg合金高温性能的影响Effect of Y on high temperature mechanical properties of
AlSi7Cu2Mg alloy
利用高温拉伸力学性能测试仪、扫描电镜(SEM)和DTA等测试分析手段，研究不同含量Y对AlSi7Cu2Mg合金的高温力学性能的影响。结果表明：随温度的升高，Y含量为0.15%(质量分数)的AlSi7Cu2Mg合金的强度及伸长率均呈下降趋势；随着Y含量的增加，AlSi7Cu2Mg合金在250
℃的高温强度(抗拉强度和屈服强度)和伸长率先增加后降低；Y含量为0.1%的AlSi7Cu2Mg合金的高温力学性能最高，抗拉强度、屈服强度和伸长率分别为275
MPa、240
MPa和12.4%；微量Y对AlSi7Cu2Mg合金的强化作用主要是其对Si相的变质细化作用，在Y含量为0.1%时，Si相获得最佳的变质效果。
The effect of Y contents on the high temperature
mechanical properties of AlSi7Cu2Mg alloys was investigated by electronic
universal material testing machine, scanning electron microscopy (SEM) and
differential thermal analysis (DTA). The results indicate that the ultimate
tensile strength and elongation of the AlSi7Cu2Mg alloy with 0.15% Y (mass
fraction) decrease with increasing temperature. The ultimate tensile strength,
yield strength and elongation of the AlSi7Cu2Mg alloys with 0.1% Y increase up
to the maximum value and then decrease with increasing Y content at 250 ℃. The
alloy with 0.1% Y has the highest high temperature mechanical properties
(ultimate tensile strength of 275 MPa, yield strength of 240 MPa and elongation
of 12.4%). The strengthening effect of trace Y on the AlSi7Cu2Mg alloys is
mainly relying on the modification of eutectic Si phase, the optimal
modification of Si phase can be obtained with 0.1% Y.
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