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稀土Y對AlSi7Cu2Mg合金高溫性能的影響
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更新時(shí)間:2015-08-21
利用高溫拉伸力學(xué)性能測試儀、掃描電鏡(SEM)和DTA等測試分析手段,研究不同含量Y對AlSi7Cu2Mg合金的高溫力學(xué)性能的影響。
稀土Y對AlSi7Cu2Mg合金高溫性能的影響Effect of Y on high temperature mechanical properties of
AlSi7Cu2Mg alloy
利用高溫拉伸力學(xué)性能測試儀、掃描電鏡(SEM)和DTA等測試分析手段,研究不同含量Y對AlSi7Cu2Mg合金的高溫力學(xué)性能的影響。結(jié)果表明:隨溫度的升高,Y含量為0.15%(質(zhì)量分?jǐn)?shù))的AlSi7Cu2Mg合金的強(qiáng)度及伸長率均呈下降趨勢;隨著Y含量的增加,AlSi7Cu2Mg合金在250
℃的高溫強(qiáng)度(抗拉強(qiáng)度和屈服強(qiáng)度)和伸長率先增加后降低;Y含量為0.1%的AlSi7Cu2Mg合金的高溫力學(xué)性能最高,抗拉強(qiáng)度、屈服強(qiáng)度和伸長率分別為275
MPa、240
MPa和12.4%;微量Y對AlSi7Cu2Mg合金的強(qiáng)化作用主要是其對Si相的變質(zhì)細(xì)化作用,在Y含量為0.1%時(shí),Si相獲得最佳的變質(zhì)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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