Mechanisms of material removal during low stress and high stress abrasion of aluminum alloy-zircon particle composites

摘要: Abstract (Al11.8Si4.0Mg alloy)-zircon particle composites containing zircon (size, 100 μm) volume fractions of 0.15 and 0.35 have been prepared by liquid metallurgy techniques. The low stress abrasion resistance these was tested using a rubber wheel test apparatus with American Foundrymen's Society 50–70 mesh rounded quartz abrasive. Scratch tests were performed on metallographic surfaces fixed-depth scratch in order to simulate the high pin-on-drum test. results show that abrasive wear rate aluminum alloy decreased factor 5 as result dispersion fraction particles. composite (a Vickers hardness 144 HV) under condition found be equal normalized AISI 1045 steel (197 HV). Scanning electron microscopy micrographs abraded conditions particles stand proud matrix without any pull-out or interfacial debonding. Material removal mechanisms during appear governed microfracture particles, leading subsequent pit formation. There is direct correlation between material testing abrasion. In both cases there catastrophic fragmentation