Experiments with different particle sizes (120—380 μm) were carried out using a new type of impact wear test machine. The impact wear mechanism and interface response of TC4 alloy in sand and dust environment during impact were studied. The results showed that smalls and particle could significantly affect the impact wear behavior of TC4 alloy, and the sand particle will be broken and deposited on the surface during impact. The worn surface is relatively rough and significantly higher than the original surface of the specimen. As the particle size increased, the peak of impact force decreased significantly, the impact contact time got longer, the energy absorption increased, and the wear area became larger obviously. With the increase of impact cycles, the peak of impact force decreased, the energy absorption rate increased, and the volume of material accumulation tended to increase. The damage mechanism of TC4 alloy under particle impact wear is mainly manifested as the cutting and debris accumulation.
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