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首页> 外文期刊>Journal of Materials Engineering and Performance >15Mn 3Si 2 Phase During Solidification of a Novel Al-12%Si-4%Cu-1.2%Mn Heat-Resistant Alloy and Its Thermal Stability]]>
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15Mn 3Si 2 Phase During Solidification of a Novel Al-12%Si-4%Cu-1.2%Mn Heat-Resistant Alloy and Its Thermal Stability]]>

机译：<！[CDATA [形成AL <下标> 15 MN <下标> 3 SI <下标> 2 阶段在新的AL-12％SI-4％CU- 1.2％Mn耐热合金及其热稳定性]]>

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摘要

The formation of Al~(15)Mn~(3)Si~(2)phase in Al-12Si-4Cu-1.2Mn (wt.%) alloy during solidification was investigated by adopting CALPHAD method and microstructural observation by optical microscopy, SEM–EDS, TEM–EDS/SAD and XRD analysis; SEM fixed-point observation method was applied to evaluate its thermal stability. As-cast microstructural observation consistently demonstrates the solidification sequence of the studied alloy predicted by phase diagram calculation. Based on the phase diagram calculation, SEM–EDS, TEM–EDS/SAD and XRD analysis, as well as evidences on Al-Si-Mn-Fe compounds from the literature, the primary and eutectic Mn-rich phases with different morphologies in the studied alloy are identified to be Al~(15)Mn~(3)Si~(2)that has a body-centered cubic (BCC) structure with a lattice constant of a ?=?1.352?nm. SEM fixed-point observation and XRD analysis indicate that Al~(15)Mn~(3)Si~(2)phase has more excellent thermal stability at high temperature than that of CuAl~(2)phase and can serve as the major strengthening phase in heat-resistant aluminum alloy that has to face a high-temperature working environment. Results of tension test show that addition of Mn can improve the strength of Al-Si-Cu alloy, especially at elevated temperature.
机译：通过采用Calphad方法和通过光学显微镜，SEM，通过采用Calphad方法和微观结构观察来研究Al-12Si-4Cu-1.2Mn-1.2Mn（WT.％）合金中的Al〜（15）Mn〜（3）相的形成。 -ds，tem-eds / sad和xrd分析; SEM定点观察方法被应用于评估其热稳定性。由于铸造的微观结构观察一致地证明了通过相图计算预测的研究合金的凝固序列。基于相图计算，SEM-EDS，TEM-EDS / SAD和XRD分析，以及来自文献的Al-Si-Mn-Fe化合物的证据，主要和共晶MN的富含阶段具有不同的形态所研究的合金被鉴定为Al〜（15）Mn〜（3）Si〜（2），其具有身体为中心的立方（BCC）结构，晶格常数为a？= 1.352纳米。 SEM定点观察和XRD分析表明Al〜（15）Mn〜（3）Si〜（2）相在高温下具有比Cual〜（2）相的高温更优异的热稳定性，并且可以作为主要的强化耐热铝合金的相位，必须面对高温工作环境。张力试验结果表明，添加Mn可以提高Al-Si-Cu合金的强度，尤其是在升高的温度下。

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