Influence of Rolling Deformation on Morphology Evolution and Properties of Second-ary Phase in Al-Sn Alloy
The influence of rolling deformation on the morphology evolution of secondary phases and friction properties of Al-Sn alloy was investigated.Al-Sn alloy ingots were prepared by induction melting process.Then,the alloy was subjected to rolling treatment.The rolling deformation was precisely controlled to reveal the morphology evolution of Sn-rich secondary phases.The results iudicate that as the rolling deformation increases,the Sn-rich secondary phase is gradually transformed from a continuous network structure to a discontinuous short fiber structure,and the friction coef-ficient remains around 0.27.However,the sliding-slip phenomenon during the friction process is significantly weak-ened.Meanwhile,the Vickers hardness of alloy is increased from 17.9 HV in as-cast state to 28.8 HV at 75％deforma-tion,and the wear rate is decreased from 7.49X 10 4 mm3/(N·m)to 5.51 × 10-4 mm3/(N·m).Therefore the short fiber like second phase enhances the self-lubricating performance of alloys,and the synchronous improvement of hardness and self-lubricating performance leads to the improvement of wear resistance of Al-Sn alloys.
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