|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys II
||Solid Solution Strengthening of Co3(Al, TM) L12 Phase: An Integrated First-principles Calculations and Experimental Study
||William Yi Wang, Bin Gan, Fei Xue, Shun-Li Shang, Yi Wang, HongChao Kou, JinShan Li, Xi-Dong Hui, Qiang Feng, Zi-Kui Liu
|On-Site Speaker (Planned)
||William Yi Wang
In this work, the solutes strengthening of Co3(Al, TM) are investigated by the integrated first-principles calculations and experimental study. Here, the solute atoms (TM) include Hf, Mo, Re, Ru, Ta, Ti, V, W and Y. In terms of bonding charge density and electron work function, the bond structures and strengths of the Co3(Al, TM) phase and its solute-containing (001) anti-phase boundary (APB) reveal the complex electron environment induced by the variation of the lattice distortion around the fault layers. It is understood that with the segregation of TM at (001) APB, the bond strength around the fault layers are improved by the electron redistribution. The improved local bonding strength, contributing to an enhanced tensile strength and hardness, is further validated by the instrumented nanoindentation. This work reveals the electronic and the atomic basis for the solid solution strengthening mechanism in Co3(Al, TM) L12 Phase.