Effect of multi-directional hot forging on mechanical and tribological properties of Al-7Si-4Zn-3Cu alloy


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ALEMDAĞ Y. , KARABIYIK S. , PÜRÇEK G.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.36, no.1, pp.255-265, 2021 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 36 Issue: 1
  • Publication Date: 2021
  • Doi Number: 10.17341/gazimmfd.523117
  • Title of Journal : JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Page Numbers: pp.255-265
  • Keywords: Al-Si alloys, multi-directional forging, friction and wear, AL-SI-ALLOY, GRAIN-REFINEMENT, WEAR CHARACTERISTICS, SLIDING WEAR, ALUMINUM, SILICON, MICROSTRUCTURE, BEHAVIOR, EVOLUTION, AL-7SI

Abstract

In this study, mechanical and tribological properties of multi-directional hot forged Al-7Si-4Zn-3Cu alloy at different cycles were investigated. Multi-directional hot forging resulted in both breaking up the silicon particles and the elimination of dendritic structure of the alloy. This process increased the yield and tensile strength with percentage elongation of the alloy but decreased its hardness. The highest yield and tensile strength were obtained from the alloy forged two cycles, while the alloy forged three cycles showed a lowest hardness but the highest percentage elongation. On the other hand, hot forged alloy exhibited higher friction coefficient and lower wear resistance than those of its homogenized state. After the wear test, smeared and delaminated layers were observed on the worn surface of the alloy in all test conditions. This observation showed that smearing and delamination were effective wear mechanisms of the alloy in all states.