Abstract
Light weight hybrid aluminium matrix composites (AMCs) were developed for brake rotor applications and their wear behaviour was compared with commercial grade material under dry-sliding wear conditions. LM27 Al-alloy was reinforced with sillimanite/rutile particles (size: 1–32 μm; loading: 0–15 wt%.). Uniform distribution of reinforcement was achieved till 15 wt% level. High nano-hardness and high thermal conductivity at particle-matrix interface indicated good interfacial-bonding. Hybrid AMCs containing 15 wt% reinforcement showed 52% decrease in wear rate over base alloy and was comparable to commercial grade material used in industries. Hybrid AMCs displayed superior thermal conductivity over commercial material. Each reinforcement played a diverse but significant role. Sillimanite improved interfacial-bonding between matrix-reinforcement whereas rutile provided increased lubricity/grain refinement of the composites.
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