Working Paper Article Version 1 This version is not peer-reviewed

Kinetics of Deformation and Recovery inQuasi-Stationary Deformation of Particle-Hardened Ultrafine-Grained Cu-Zr at 0.5 Tm Studied by Load Changes

Version 1 : Received: 24 September 2019 / Approved: 26 September 2019 / Online: 26 September 2019 (03:02:40 CEST)

A peer-reviewed article of this Preprint also exists.

Blum, W.; Dvořák, J.; Král, P.; Eisenlohr, P.; Sklenička, V. Strain Rate Contribution due to Dynamic Recovery of Ultrafine-Grained Cu–Zr as Evidenced by Load Reductions during Quasi-Stationary Deformation at 0.5 Tm. Metals 2019, 9, 1150. Blum, W.; Dvořák, J.; Král, P.; Eisenlohr, P.; Sklenička, V. Strain Rate Contribution due to Dynamic Recovery of Ultrafine-Grained Cu–Zr as Evidenced by Load Reductions during Quasi-Stationary Deformation at 0.5 Tm. Metals 2019, 9, 1150.

Journal reference: Metals 2019, 9, 1150
DOI: 10.3390/met9111150

Abstract

During quasi-stationary tensile deformation of ultrafine-grained Cu-0.2 mass%Zr at 673 K and a deformation rate of about 10−4 s−1 load changes were performed. Relative load reductions by more than about 25% to relative loads R < 0.75 initiate anelastic back flow. Subsequently the creep rate turns positive again and goes through a relative maximum. This is interpreted by a strain rate contribution ε ̇− from recovery of dislocations. Back extrapolation indicates that ε ̇− contributes about (20 ± 10)% to the quasi-stationary strain rate. The stress dependences of the recovery-strain rate ε ̇− and the rate ε ̇+ related with generation and storage of dislocations are discussed in terms of thermally activated processes characterized by different kinetics.

Subject Areas

cu-zr; ecap; ultrafine-grained; deformation; dynamic recovery; transient; load change tests

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