|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals
||Theoretical Calculations for Pore Formation in Aluminum during Solidification
||Pedram Yousefian, Murat Tiryakioglu
|On-Site Speaker (Planned)
Porosity is one of the main reasons of hot tearing, which is one of the most serious defects in casting parts that happens under uniaxial tension in a poorly fed metal casting products. In this paper, Theoretical calculations for homogeneous and heterogeneous nucleation of pores in aluminum during solidification with and without dissolved gas were considered. Critical radius of the embryo was calculated by using Fisher’s approach with and without considering effects of curvature energy on the surface tension. Meager calculated values for the probability of homogenous vacancy clusters proved there is not any chance for observing homogeneous pore formation in pure solidifying aluminum. By considering the possibility of homogeneous nucleation in the pure melt, beyond a shadow of doubt, hot tearing may only happen by heterogeneous nucleation at bifilms or oxide surfaces entrained in the liquid aluminum as nucleation sites.
||Planned: Supplemental Proceedings volume