|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals
||Porosity Change of A356 by Excess Sr Addition
||Baturalp Atakav, Ozen Gursoy, Eray Erzi, Derya Dispinar
|On-Site Speaker (Planned)
The most widely used aluminium alloys are 3xx series that contain Si as the major alloying element. Silicon is not dissolved in aluminium and remains as coarse crystalline. Approximately 100 to 200 ppm strontium is added in order to alter this thick structure to finer fibrous morphology. This modification causes mechanical properties to be increased. In addition, eutectic temperature is decreased which causes improved fluidity. Therefore, there are several studies on Sr modification of Al-Si alloys. However, there is a long going debate in literature as to whether Sr addition increased porosity or not. In this work, excess amount of Sr (1 wt%) was added to A356 alloy and bifilm index of the melt was measured after prolonged holding time. The tests were repeated three times and it was found that bifilm index and number of bifilms were decreased significantly after 1 hour of holding due to healing of bifilms.
||Planned: Supplemental Proceedings volume