The effect of Ti alloying on the mechanical properties and microstructure of a Zn-Al-Cu-Mg alloy

Turk A., Durman M., Kayali E.

ZEITSCHRIFT FUR METALLKUNDE, vol.94, no.8, pp.892-896, 2003 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 94 Issue: 8
  • Publication Date: 2003
  • Journal Name: ZEITSCHRIFT FUR METALLKUNDE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Page Numbers: pp.892-896
  • Istanbul Technical University Affiliated: No

Abstract

The effect of Ti additions (0.01-0.20 wt.%) on the hardness, ultimate tensile strength, impact strength and creep properties of the gravity-cast Zn-Al-Cu-Mg alloy ZA-8 has been investigated. The Ti additions have no significant effect on the hardness. The ultimate tensile strength of the standard ZA-8 alloy has not been changed significantly with Ti additions up to 0.15 wt.% and then decreased with further increase in Ti content. The impact strength shows a maximum around 0.05-0.15 wt.% Ti. The lowest creep resistance is obtained at 0.01 wt.% Ti, and the highest value of creep resistance is reached for 0.20 wt.% Ti. Metallographic studies indicated that the addition of Ti has a profound effect on the microstructure. Also, Ti forms a complex-shaped intermetallic compound which was identified as TiZn15 by X-ray diffraction. It is suggested that the TiZn15 particles cause the increase in creep resistance and decrease in tensile strength.