EFFECT OF COPPER ADDITIONS ON MICROSTRUCTURE, CASTING AND MECHANICAL PROPERTIES OF AZ91 MAGNESIUM ALLOY


Ünal M. , Koç E. , Türen Y. , Sun Y. , Ahlatcı H.

161st The IIER International Conference, Barcelona, İspanya, 24 - 26 Nisan 2018, ss.55-58

  • Basıldığı Şehir: Barcelona
  • Basıldığı Ülke: İspanya
  • Sayfa Sayısı: ss.55-58

Özet

In this study, the effect  of Cu element addition varied between 0.5  -  1.0 and 2.0 wt.% on the microstructure,casting and mechanical  properties of AZ91 magnesium alloy were investigated. The microstructural results showed that as increasing Cu additions into the AZ91 alloy, caused coarsening of the phases occurring at grain boundaries. Addition of 2% Cu forms darker phases and shows a more homogeneous distribution in the structure of the grains. When examining the effect on casting properties; as the increasing of Cu additions the fluidity of AZ91 alloy increased was observed. In the hot tear tests two different mold systems were used. Hot tearing were observed in the longest section in the tests using " the mold same diameter, different lengths" and when the "the mold different diameter, same lengths" were used, Hot tears disappeared in all of the samples with a diameter of 12 and 16 mm  while all the samples with a diameter of 8 mm had a hot tear with Cu additions.  Little  bit  decrease  in  hardness  observed  with  the  addition  of  0.5  wt.%  Cu  while  1.0  wt.%  and  2.0  wt.%  Cu additions showed a slight increase in hardness. Tensile strength of the   alloy increased with the addition of Cu to the AZ91 alloy, but the AZ91 alloy also showed a slight decrease in elongation.