Abrasive Wear Behaviour of TiB2 Reinforced In-Situ Synthesized Magnesium RZ5 Alloy based Metal Matrix Composites

Abstract

Abstract: Abrasive wear behaviour of TiB2 reinforced in-situ magnesium RZ5 alloy-based metal matrix composites was investigated using a pin-on-disc wear testing apparatus. The in-situ RZ5/TiB2 composite was synthesized through the self-propagating high-temperature synthesis route. The microstructure of the composite revealed a near-uniform distribution of TiB2 in magnesium matrix. The abrasive wear behaviour on the base RZ5 alloy and TiB2 reinforced composites were investigated in terms of weight loss and co-efficient of friction. The effect of varying applied load (10�30�N), sliding distance (1000�3000�m), and wt% of TiB2 content on abrasive wear properties were analysed. The results indicated a higher wear loss of the materials with increase in the applied load and sliding distance. Co-efficient of friction decreased with increase in the applied load but increased with increase in sliding distance. The morphology of the worn surface under different test conditions was analysed in terms of delamination, wear groove, oxide, and wear debris formation using field emission scanning electron microscope. Large flaky shape wear debris was noticed when the load applied is 30�N whereas equiaxed wear debris was noticed when the applied load is 10�N. Increase in sliding distance increased the contact temperature led to the formation of the oxide layer on the contact surface. Graphic Abstract: [Figure not available: see fulltext.]. � 2020, The Korean Institute of Metals and Materials.