Wear mechanisms during lubricated sliding of XD™ metal matrix composites against steel

Effect of age-hardening on dry sliding wear behavior of mushy state rolled in-situ Al-4.5Cu-5TiB2 composites

“…Moreover, earlier reports have shown that addition of TiB 2 as reinforcement significantly enhances the wear resistance of the composite compared to that of the monolithic alloy [19][20][21][22][23][24][25][26][27]. The superior wear resistance found in case of the in-situ Al-TiB 2 composite has been attributed to strong particle-matrix interfacial bond in this material [23,24].…”

“…This causes an increase in dislocation density in the matrix of the Al-MMCs, leading to significant strengthening [11][12][13] as well as enhancement of aging kinetics [14][15][16][17][18]. Moreover, earlier reports have shown that addition of TiB 2 as reinforcement significantly enhances the wear resistance of the composite compared to that of the monolithic alloy [19][20][21][22][23][24][25][26][27]. The superior wear resistance found in case of the in-situ Al-TiB 2 composite has been attributed to strong particle-matrix interfacial bond in this material [23,24].…”

“…A majority of the earlier studies have been devoted to the effect of reinforcement on wear behavior of Al-based MMCs [19][20][21][22][23][24][25][26][27]. However, relatively fewer investigations have been focused on the effects of age-hardening of matrices, with most of them dealing with Al-alloy-SiC composites [45][46][47][48][49][50].…”

“…In general, pull-out of the SiC particles is known to have a strong influence on wear resistance of the composites [46]. As pull-out of the TiB 2 particles has been found to be relatively less frequently occurring due to clean and well-bonded particle-matrix interfaces in the in-situ processed Al alloy-TiB 2 composites [23,24], age-hardening of the matrix is expected to have significant influence on their wear resistance.…”

Wear Behaviour of Squeeze-Cast Al 2014 Alloy and <i>In-Situ</i> 5 vol% TiB₂/2014 Composite

“…However, compared with the gravity-cast composite, improvement in wear resistance of the squeeze-cast composite is attributed to not only increase in hardness and reduction in casting defects but also improved dispersion of TiB 2 particles during squeeze casting. The earlier reports 32,33) have indicated the wear mechanism of AlTiB 2 composite. It is proposed that the aluminium matrix surrounding the particles is worn away preferentially in the initial stages under sliding wear conditions, leaving the reinforcing particles in contact with the steel counterface.…”