Some fundamental experiments on high temperature creep

• Published in: Journal of the mechanics and physics of solids 1955, Vol.3 (2), p.85,IN1,89,IN3,105-88,IN2,104,IN4,116
• Main Author: Dorn, J.E.
• Format: Article
• Language: English
• ISSN: 0022-5096
• DOI: 10.1016/0022-5096(55)90054-5

At high temperatures, the creep strain, ϵ, appears to be a function of a temperature ( T), compensated time ( t), namely te −ΔH RT , and the stress. X-ray analyses and plastic properties reveal that the same structures are developed at the same values of te −ΔH RT following creep at the same stress. Thus ϵ = ƒ(te −ΔH RT ) , for the same stress. When the creep rate, ϵ, is evaluated as a function of stress, σ, for the same structure ϵ = Se −ΔH RT φ(σ) where S depends on the structure and ▪ Although B and n appear to be insensitive to structural changes attending creep of annealed alloys, they decrease with increasing solute additions and cold working. Transients attending loading and unloading and the coincidence of the activation energy for creep, ΔH, with that for self-diffusion suggest that high temperature creep might be ascribed to a dislocation climb process.