|About this Abstract
||MS&T23: Materials Science & Technology
||Manufacturing and Processing of Advanced Ceramic Materials
||The Influence of Cr on Microstructural Evolution of Alumina
||Yathreb Shalabi, Rachel Marder, Wayne D. Kaplan
|On-Site Speaker (Planned)
||Wayne D. Kaplan
Grain growth plays a significant role in microstructural evolution during sintering of polycrystalline materials. Many studies showed that dopants and/or impurities can cause significant changes to the grain boundary mobility. This can occur by equilibrium (Gibbsian) segregation of solutes to grain boundaries, which is driven by a reduction in grain boundary energy. The segregated solutes may then induce solute-drag or solute-acceleration, changing the grain boundary mobility and how the microstructure evolves. This study investigates how Cr affects the effective mobility of grain boundaries in alumina. Doping alumina with Cr reduces the effective mobility. However, Cr-doped alumina was found to have significantly more occluded pores than Mg-doped or undoped alumina. The possible mechanisms by which Cr influences grain boundary motion and pore occlusion will be discussed.