摘要
The microstructure,mechanical properties,and the effects of sliding distance and material removal mechanism on two-body abrasive wear behaviour of hypereutectic Al-Si-Si C composite and its matrix alloy were investigated.The hypereutectic Al-Si-Si C composite was prepared by stir casting route.The hardness,ultimate tensile strength and yield strength of the composite are increased by 17%,38%,and 30%respectively compared with those of the matrix alloy,while the elongation of the composite is decreased by 48%compared with that of the matrix alloy.The wear rate of the materials is increased with increasing the abrasive size and the applied load and does not vary with the sliding distance.The wear surfaces and wear debris of the materials were characterized by high-resolution field emission scanning electron microscopy(HR FESEM)and wear mechanism was analyzed for low and high load regimes.
采用搅拌铸造法制备过共晶Al-Si-Si C复合材料,研究该复合材料及其基体合金的显微组织、力学性能以及滑动距离和材料去除机理对材料二体磨料磨损行为的影响。结果表明,与基体合金相比,复合材料的硬度、极限抗拉强度和屈服强度分别提高17%、38%和30%,而伸长率降低48%。材料的磨损率随磨料粒度和载荷的增大而增大,不随滑动距离的变化而变化。通过高分辨场发射扫描电镜(HRFESEM)对材料的磨损表面和磨屑进行表征,分析材料在高、低载荷状态下的磨损机理。
基金
the financial support received to the first author as a scholarship from MHRD,Government of India.
作者简介
Corresponding author:Raj Kumar SINGH,E-mail:raju_tit@yahoo.co.in
