Effects of T6 heat treatment on thermal stability and wear behaviour of Al-12·5Si-4·5Cu-1·0Mg alloy

K. Y. Lee, S. L. Lee, C. T. Wu, W. C. Chen, J. C. Lin

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The present study elucidates how T6 heat treatment affects thermal stability and wear behaviourof Al-12·5Si-4·5Cu-1·0Mg alloy. The experimental alloys under as cast and T6 heat treatedconditions were isothermally heat treated at 300uC for 100 h to investigate thermal stability andwear behaviour. Owing to the precipitation of a large amount of l9 (Al 5Cu 2Mg 8Si 6) and h9 (Al 2Cu)phases, T6 heat treated alloy showed the highest hardness before isothermal heat treatment. Thecoarsening of l9 and h9 phases led to a large decrease in hardness following isothermal heattreatment. The thermal stability of the T6 heat treated alloy was much worse than that of the ascast alloy. For wear behaviour, the as cast and T6 heat treated alloys showed the same wear ratewith 10 N load after isothermal heat treatment, which indicated that the wear rates of Al-12·5Si-4·5Cu-1·0Mg alloys were independent on T6 heat treatment. Under 40 N load, the wear resistance of as cast alloy was superior to that of T6 heat treated alloy after isothermal heat treatment.

Original languageEnglish
Pages (from-to)639-643
Number of pages5
JournalMaterials Science and Technology
Volume28
Issue number6
DOIs
StatePublished - 2012

Keywords

  • Al-12·5Si-4·5Cu-1·0Mg alloy
  • T6 heat treatment
  • Thermal stability
  • Wear behaviour

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