Mechanical properties of multi-directional forged Al-7Si-4Zn-3Cu alloy

ALEMDAĞ Y., KARABIYIK S., YANAR H., PÜRÇEK G.

13th International Conference on Superplasticity in Advanced Materials, ICSAM 2018, Petersburg, Russia, 19 - 22 August 2018, vol.385 DDF, pp.250-255 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 385 DDF
  • Doi Number: 10.4028/www.scientific.net/ddf.385.250
  • City: Petersburg
  • Country: Russia
  • Page Numbers: pp.250-255
  • Keywords: Al-Si based alloys, Grain refinement, Multi directional forging, Severe plastic deformation
  • Karadeniz Technical University Affiliated: Yes

Abstract

© 2018 Trans Tech Publications, SwitzerlandIn this study, Al-7Si-4Zn-3Cu alloy was processed by multi-directional forging (MDF) at 3, 6 and 9 passes corresponding to one, two and three cycle, respectively. The structural and mechanical properties of the alloys were investigated in the as-cast, homogenized and MDFed states. The MDF resulted in a severely deformed and refined microstructure with eliminated casting defects like micro-porosity with nearly homogeneous distributed fine silicon particles. The ultimate tensile strength (UTS) and yield strength (YS) of the alloy increased up to two cycle, above which they decreased, while the percent elongation (E%) increased continuously with the cycle number. The compressive strength (CS) and micro and macro hardness of the alloy decreased with increasing MDF cycles. The results were evaluated according to microstructural changes depending on MDF cycles.