|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||In-situ Methods for Unraveling Structure-Property Relationships in Light Metals
||The Effect of Grain Refinement on Hot Tearing in AZ91D Magnesium Alloys
||Tyler Davis, Lukas Bichler, Francesco D'Elia, Norbert Hort
|On-Site Speaker (Planned)
The AZ91 magnesium alloy is widely used for diverse casting applications, despite its high susceptibility to hot tearing during solidification. In this work, the effect of grain refinement on hot tearing was quantitatively studied. Specifically, the relationship between the alloys’ cooling rate and <I> in-situ </I> force evolution during solidification was related to the severity of hot tears. The results suggest that the load evolution rate and microstructure morphology were critical determinants of the hot tear severity for both unrefined and grain-refined alloys. The grain refiners were seen to significantly reduce the overall force and force rate, which contributed to the elimination of hot tearing in the AZ91 alloy under standard casting conditions.