CAJ | 학술논문

采用快速凝固气体雾化工艺制备Al-27%Si合金粉末，研究合金粉末形貌和热处理对组织的影响，利用X射线衍射仪和显微硬度计等对Al-27%Si合金粉末中硅相的析出与长大进行表征。结果表明：快速凝固Al-27%Si合金粉末由基体α(Al)相、块状β-Si 相和枝晶状共晶硅相组成；经热处理后，β-Si相发生粗化，共晶硅相逐渐转变为块状相且发生粗化；在500℃下加热保温后，α(Al)相和β-Si相的衍射峰强度随时间延长而增大，α(Al)相衍射峰向低角度偏移；合金粉末显微硬度在500℃下加热，初期有下降趋势，但随时间延长，不再下降，而是维持相对稳定。
채용쾌속응고기체무화공예제비Al-27%Si합금분말，연구합금분말형모화열처리대조직적영향，이용X사선연사의화현미경도계등대Al-27%Si합금분말중규상적석출여장대진행표정。결과표명：쾌속응고Al-27%Si합금분말유기체α(Al)상、괴상β-Si 상화지정상공정규상조성；경열처리후，β-Si상발생조화，공정규상축점전변위괴상상차발생조화；재500℃하가열보온후，α(Al)상화β-Si상적연사봉강도수시간연장이증대，α(Al)상연사봉향저각도편이；합금분말현미경도재500℃하가열，초기유하강추세，단수시간연장，불재하강，이시유지상대은정。
The rapidly solidified powders of Al-27%Si alloy were manufactured by gas atomization process. The effects of morphologies of alloy powders and heat treatment on the microstructure were studied. The precipitation and growth of silicon phase were investigated with X-ray diffractometer and microscope hardness tester. The results show that the rapidly solidified powders of Al-27%Si alloy are composed of α(Al) phase, β-Si bulk phase and dendritic structure eutectic silicon phase. After heat treatment, theβ-Si bulk phase is coarsened and the eutectic silicon phase is changed to bulk phase and then coarsens. When held at 500℃, the diffraction peak intensities of theα(Al) phase andβ-Si phase are enhanced with the time prolonging, and the position of theα(Al) phase peak shifts to lower angle. At the beginning of heat treatment at 500℃, the microhardness of the alloy powers decreases, followed by remaining relatively constant as the time prolonging.