CAJ | 학술논문

采用喷射沉积和热挤压致密化相结合的方法制备 Al-27%Si 合金,研究热处理对合金的组织及性能的影响.利用金相显微镜、扫描电镜和MTS-858型疲劳试验机等手段对Al-27%Si合金喷射沉积挤压态和热处理态的显微组织和力学性能进行观察与测试.结果表明:喷射沉积Al-27%Si合金组织细小均匀,初晶Si均匀弥散地分布在连续 Al 基体中,无针状共晶硅存在;采用合理的热挤压致密化工艺可以显著消除材料中的孔隙,致密度达到99.5%;热处理能够进一步改善材料的组织,但会降低材料的屈服强度.
채용분사침적화열제압치밀화상결합적방법제비 Al-27%Si 합금,연구열처리대합금적조직급성능적영향.이용금상현미경、소묘전경화MTS-858형피로시험궤등수단대Al-27%Si합금분사침적제압태화열처리태적현미조직화역학성능진행관찰여측시.결과표명:분사침적Al-27%Si합금조직세소균균,초정Si균균미산지분포재련속 Al 기체중,무침상공정규존재;채용합리적열제압치밀화공예가이현저소제재료중적공극,치밀도체도99.5%;열처리능구진일보개선재료적조직,단회강저재료적굴복강도.
A kind of novel packaging material, Al-27%alloy, was prepared by a method comprised of spray deposition and subsequent hot extrusion, then, the effects of heat treatments on the microstructures and mechanical properties of the alloy were studied. The microstructures and mechanical properties of hot extruded and heat treated Al-27%Si alloy were investigated with optical microscope, scanning electronic microscope and MTS-858 type fatigue testing machine. The experimental results show that the spray-deposited Al-27%Si alloy after hot extrusion has fine, homogeneous microstructure with no needle-like eutectic Si but small primary Si particles uniformly dispersed in the Al matrix, besides an increase of size to some degree, even the following heat treatments make little difference to it. Appropriate hot extrusion process can eliminate the porosities remarkably, so as to improve the relative density of the alloy to 99.5%. The microstructures of Al-27%Si experience further improvement after certain heat treatments, while the transformations of mechanical properties are opposite.