Effect of copper content on the mechanical and tribological properties of ZnAl27-based alloys


Savaskan T. , Purcek G. , Hekimoglu A.

TRIBOLOGY LETTERS, vol.15, no.3, pp.257-263, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 3
  • Publication Date: 2003
  • Doi Number: 10.1023/a:1024817304351
  • Title of Journal : TRIBOLOGY LETTERS
  • Page Numbers: pp.257-263

Abstract

One binary ZnAl27- and five ZnAl27-based ternary alloys containing 1-5% Cu were produced by permanent mould casting. Their friction and wear properties were examined using a block-on-ring test machine after determining their hardness and tensile strength. It was observed that the hardness and tensile strength of the ZnAl27-based ternary alloys increased with increasing copper content up to 2% due to solid-solution hardening, above which their tensile strength decreased, while hardness continued to increase. This is attributed to the formation of copper-rich epsilon and T' phases, which reduce the solid-solution hardening of the alloys. It was found that the wear volume loss of the ZnAl27-based alloys decreased with increasing copper content up to 2% but showed a small increase above this level. Therefore, it was concluded that the wear resistance of ZnAl27-based alloys containing 1 to 5% Cu correlates well with their tensile strength. In addition, smearing and scratches were found to be the main features of the wear surfaces of the ZnAl27-based alloys under static loading and lubricated sliding conditions.