Analytical approximation for calculation of the short-range order in disordered alloys with nonpair atomic interactions

2000 ◽  
Vol 61 (13) ◽  
pp. 8606-8609 ◽  
Author(s):  
R. V. Chepulskii
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Analytical Approximation ◽  
Range Order ◽  
Disordered Alloys ◽  
Atomic Interactions

Modeling W-V and W-Ta Alloys for Fusion Applications: Phase Stability, Short-Range Order and Point Defect Properties

2011 ◽  
Vol 1298 ◽  
Author(s):  
M. Muzyk ◽  
D. Nguyen-Manh ◽  
K.J. Kurzydlowski ◽  
N.L. Baluc ◽  
S.L. Dudarev
Keyword(s):  
Phase Transformations ◽  
Phase Stability ◽  
Short Range ◽  
Density Functional ◽  
Short Range Order ◽  
Interstitial Atom ◽  
Range Order ◽  
Thermally Activated ◽  
Atomic Interactions ◽  
Fusion Applications

ABSTRACTWe have performed density-functional theory (DFT) calculations of phase stability, formation energies of radiation defects in tungsten-based binaries W-Ta and W-V. These alloys are candidate for DEMO divertor applications because of their high melting point and expected improved ductility and fracture toughness in comparison with tungsten. We have identified the lowest energy intermetallic compounds, which should form at low temperatures, and calculated the effective inter-atomic interactions. Using Monte-Carlo calculations, we calculated the temperature of order-disorder phase transformations for these alloys. The predicted temperature of order-disorder phase transformations is relatively low and at high temperature it is found that the short-range order is present for both alloys. Ab-initio calculations also show that vanadium atoms strongly trap self-interstitial atom defects in W-V alloys, whereas Ta atoms in W-Ta alloys have very little effect on either the formation energy or thermally activated mobility of self-interstitial atom defects.

Sign in / Sign up

Export Citation Format

Share Document