Theory of solid solution strengthening of BCC Chemically Complex Alloys

An analytic model describing substitutional solid solution strengthening in body-centered cubic (BCC) complex, concentrated alloys (CCAs) based on a/2<111> screw dislocation mobility is developed and presented. At lower temperatures it assumed that dipole dragging the rate limiting mechanism, as temperature increases this changes to a jog mechanism. While both mechanisms are contained Suzuki's classical for BCC significant modifications required apply such refractory CCA's. First, two approaches incorporating net effects of complex solute chemistry contrasted using ternary NbTaTi alloy four quaternary alloys, MoNbTaTi, WNbTaTi, CrMoNbTi CrMoTaTi . Our extended higher applied analyze experimental yield data function (0.15–0.7TL, where TL absolute liquidus temperature) strain (10?5 10?2/s) range chemically including stoichiometric NbTiZr HfNbTaTiZr. We find model, just these mechanisms, gives excellent agreement with CCAs, The CCA's well quaternaries also analyzed Maresca's edge types alloys. presented useful predicting CCAs adequate high strength, which will accelerate development temperature, strength aerospace applications.