稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2009年
z3期
1-4
,共4页
phase stability%mechanical property%first-principles%Co base alloy
The energetics, electronic structure and mechanical property of Co_3(Al,W) precipitates with different ratio of Al to W in Co base alloys were investigated by the method of supercell and augmented plane waves plus local orbitals within generalized gradient approximation. The calculated results show that the L1_2 Co_3(Al,W) precipitate is the most stable when the ratio of Al to W is equal to 1. When the content of W is higher than 18.5 at%, the L12 and hexagonal structures co-exist in Co_3(Al,W) precipitates at 1173 K. It is also shown that the L12 ordered Co_3(Al,W) precipitates have an obvious strengthening effect in the disordered fcc cobalt matrix.
