INVESTIGATION OF THE EFFECT OF HOLDING TIME AND MELT STIRRING ON THE GRAIN REFINEMENT OF AN A206 ALLOY


AKAR N., Tanyel Z., KOCATEPE K. , KAYIKCI R.

MATERIALI IN TEHNOLOGIJE, vol.50, no.3, pp.433-437, 2016 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 3
  • Publication Date: 2016
  • Doi Number: 10.17222/mit.2014.302
  • Title of Journal : MATERIALI IN TEHNOLOGIJE
  • Page Numbers: pp.433-437

Abstract

Effects of melt stirring and holding time were studied with an Al-4.5 % of mass fractions of Cu (A206) alloy. The optimum level of a grain refiner was determined in conjunction with both continuously stirred and non-stirred melts during the holding time. Results showed that a mass fraction of a Ti addition of as low as 0.03 % was sufficient to obtain the 82 mu m average grain size, while a Ti addition exceeding the mass fraction of 0.03 % showed no significant effect on the grain size of castings. The grain refinement tends to fade with a long holding time in a non-stirred liquid. The results also showed that an effective grain refinement of the A206 alloy can be achieved with a long holding time as long as the liquid alloy is continually stirred.