摘要
采用P-Cu和Al-RE中间合金对过共晶Al-20Si合金进行变质处理,在观察显微组织的基础上对Al-20Si铝硅合金进行了摩擦磨损特性研究。结果表明,铸态Al-20Si合金经变质和T6热处理后,磨损失重量减少了26%～42%,摩擦因数减小了8%～11%,其耐磨性能得到明显改善。合金耐磨性能的改善与复合变质引起的共晶硅和初晶硅颗粒的细化及热处理使得合金的强度进一步提高有关。合金变质前的磨损机制主要为磨粒磨损和粘着磨损,变质后的合金磨损机制明显为磨粒磨损。
The hypereutectic AI-20Si alloys were modified with P-Cu alloys and Al-Re alloys. Friction and wear resistance of AI-20Si alloys was studied based on the observation of microscopic structures. Research shows that the abrasive-wear weight loss of unmodified eutectic alloys decreased by 26 % to 42% and the friction factor was reduced by 8% to 11% by modification and heat treatment; and wear resistance was distinctly improved. The improvement of the wear resistance can be attributed to the refinement of primary silicon and eutectic silicon particles caused by complex modification and the increase of strength after heat treatment. The wear mechanism of alloys before modification is largely abrasive wear and adhesive wear and distinctly abrasive wear after modification.
出处
《铸造技术》
CAS
北大核心
2009年第11期1448-1451,共4页
Foundry Technology
关键词
过共晶铝硅合金
复合变质
T6热处理
耐磨性能
Hypereutectic AI-Si alloy
Complex modification
T6 heat treatment
Wear resistance
