利用喷射沉积技术制备了Al-20Si-5Fe-(0～3)Mn-3Cu-1Mg合金。借助扫描电镜(SEM)、透射电镜(TEM)、X射线衍射和拉伸试验等手段研究了喷射沉积合金的微观组织和力学性能，分析了不同Mn含量对合金组织演变的影响。结果表明，当合金中加入3％Mn时，组织中针状的Al-Si-Fe金属间化合物被颗粒状的Al15(FeMh)3Si2所代替。此外，与粉末冶金Al-20Si-3Cu-1Mg合金相比，喷射沉积Al-20Si-5Fe-3Mn-3Cu-1Mg合金经热挤压和T6热处理后具有更高的高温强度。
In this study, Al-20Si-5Fe- ( 0～3) Mn-3Cu- 1Mg alloys were synthesized by spray atomization and deposition technique. The microstructures and mechanical properties of spray deposited hypereutectic Al-Si alloys were studied using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and tensile tests. The effect of Mn content on the microstructural evolution of the high-silicon aluminum alloy has been examined. The result indicates that with the addition of 3% Mn to Al-20Si- 5Fe-3Cu-lMg alloy, the needle shape of Al-Si-Fe intermetallics is substituted by the particle shape of Al15 (FeMn)3Si2 phases. Furthermore, spray-deposited Al-20Si-5Fe-3Cu-lMg alloy has greater strength than the powder metallurgy processed Al-20Si-3Cu- 1Mg alloy at elevated temperature.
参考文献
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