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

Kód výsledku v IS VaVaI

RIV/68081723:_____/19:00517145 - isvavai.cz

Výsledek na webu

https://www.mdpi.com/2075-4701/9/11/1150/htm

DOI - Digital Object Identifier

10.3390/met9111150

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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. Reductions of relative load by more than about 25% initiate anelastic back flow. Subsequently, the creep rate turns positive again and goes through a relative maximum. This is interpreted by a strain rate component ϵ ̇- nassociated with dynamic recovery of dislocations. Back extrapolation indicates that ϵ ̇- contributes the same fraction of (20 ± 10)% to the quasi-stationary strain rate that has been reported for coarse-grained materials with high fraction of low-angle boundaries, this suggests that dynamic recovery of dislocations is generally mediated by boundaries. The influence of anelastic back flow on ϵ ̇- is discussed. Comparison of ϵ ̇- to the quasi-stationary rate points to enhancement of dynamic recovery by internal stresses. Subtraction of ϵ ̇- from the total rate yields the rate component ϵ ̇+ related with generation and storage of dislocations, its activation volume is in the order expected from the classical theory of thermal glide.

Název v anglickém jazyce

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

Popis výsledku anglicky

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. Reductions of relative load by more than about 25% initiate anelastic back flow. Subsequently, the creep rate turns positive again and goes through a relative maximum. This is interpreted by a strain rate component ϵ ̇- nassociated with dynamic recovery of dislocations. Back extrapolation indicates that ϵ ̇- contributes the same fraction of (20 ± 10)% to the quasi-stationary strain rate that has been reported for coarse-grained materials with high fraction of low-angle boundaries, this suggests that dynamic recovery of dislocations is generally mediated by boundaries. The influence of anelastic back flow on ϵ ̇- is discussed. Comparison of ϵ ̇- to the quasi-stationary rate points to enhancement of dynamic recovery by internal stresses. Subtraction of ϵ ̇- from the total rate yields the rate component ϵ ̇+ related with generation and storage of dislocations, its activation volume is in the order expected from the classical theory of thermal glide.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Metals

ISSN

2075-4701

e-ISSN

—

Svazek periodika

9

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

17

Strana od-do

1150

Kód UT WoS článku

000504411600018

EID výsledku v databázi Scopus

2-s2.0-85078134846