Precipitation hardening of alloys with structure modulated within the region of micro- and macroflow. I

Abstract

The effect of precipitation of phase Co3Ti on the change in mechanical properties, measured within the range of micro (ɛ ∼- 10§-1), and macroflow (ɛ = 10−3) was studied at various stages of decomposition of the Co-Ni-Ti and Co-Ni- Ti-Al alloys. It was shown that in the region of microdeformation, a parabolic dependence σ(ɛ) is observed, and the dependence of resistance to deformation on the grain size is expressed by Petch equation. It was shown that theoretical estimations with the use of Gerold -Haberkorn and Gleiter-Hornbogen theories are in agreement with the experimentally observed changes in macroscopic yield stress during the process of precipitation of Co3Ti phase in the studied alloys.