Effects of solution treatment on wear behaviour of Al-12Si-1Mg piston alloy containing trace Zr

Authors

  • Salim Kaiser Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh

Abstract

The effects of T6 solution treatment on wear behaviour of Al–12Si–1Mg cast alloys with trace addition of zirconium were investigated. Cast alloys were given precipitation strengthen treatment by a sequence of homogenizing, solutionizing, quenching and aging. Both cast and solutionized samples were isochronally aged for 90 minutes at different temperatures up to 350oC. The effect of sliding distance on the performance tribology of the aged alloys was evaluated at ambient conditions using a pin-on-disc with load of 10N at sliding velocity of 0.64 ms-1 and with varying sliding distance ranging from 200m - 4600m. The worn surfaces were characterized by optical microscope. It is observed that significant hardening takes place in the aged alloys due to the formation of GP zones as well as formation of metastable phases. Solutionizing treatment improves the hardness and wear properties of the alloys for the reason that during solution treatment some alloying elements are re-dissolved to produce a solute-rich solid solution. Regarding the effect of Zr addition on the wear resistance of both the cast and solution treated alloys it was found that the upgrading of its wear resistance due to the precipitation of Al3Zr particles in the aluminum matrix. The main effects of such particles are an increase in hardness, strength, quality index and wear resistance at higher temperature. SEM study of alloys reveals that the solution treatment improves distribution of silicon grains. 

Author Biography

Salim Kaiser, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh

Deputy Director

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Published

2016-11-26

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Articles