Al-Si合金力学行为对Si相形貌敏感性的差异

发布时间：2018-05-09 03:46

本文选题：Al-Si合金 + 变质处理　；参考：《中国有色金属学报》2017年01期

【摘要】：采用宏观硬度、力学拉伸、室温及高温摩擦磨损、扫描电镜等测试分析方法,研究Al-Si合金经不同变质处理使Si相形貌不同时,各项力学性能的变化情况。结果表明:近共晶Al-13Si合金经Sr变质处理后拉伸性能优于P变质处理,拉伸强度相比提高23%,室温耐磨性也较P变质的好;但高温耐磨性相反,P变质处理后合金高温摩擦因数曲线变化更加平稳;两种变质处理后合金硬度值均在62~65HBW之间,表明硬度对Si相形貌变化不敏感。过共晶Al-25Si合金经Al-P合金细化处理后,拉伸强度提高53%;室温磨损量降低,尤其是高载荷条件下,高温摩擦因数曲线变化更稳定,室温和高温耐磨性均得到明显改善;但硬度值仍保持在77HBW左右不变。
[Abstract]:By means of macroscopic hardness, mechanical tensile, friction and wear at room and high temperature, scanning electron microscope and so on, the variation of mechanical properties of Si phase in Al-Si alloy with different modification treatment was studied. The results show that the tensile properties of near-eutectic Al-13Si alloy after Sr modification are better than that of P modification, the tensile strength is improved by 23%, and the wear resistance at room temperature is better than that of P modification. However, the change of friction coefficient curve is more stable after high temperature wear resistance and P modification, and the hardness values of the two modified alloys are between 62~65HBW, indicating that the hardness is not sensitive to the changes of Si phase morphology. The tensile strength and wear resistance of hypereutectic Al-25Si alloy were increased by 53% and 53% respectively, and the wear resistance at room temperature and high temperature were improved obviously under the condition of high load, especially the change of friction coefficient curve at high temperature was more stable under the condition of high load. The tensile strength of hypereutectic Al-25Si alloy was improved by 53%. However, the hardness remains at 77HBW or so.
【作者单位】：山东大学材料液固结构演变与加工教育部重点实验室;
【基金】：国家自然科学基金资助项目(51271101) 国家重点基础研究发展计划资助项目(2012CB825702)~~
【分类号】：TG146.21

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