Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg-Li Metal-Matrix Composites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F21%3AN0000008" target="_blank" >RIV/26316919:_____/21:N0000008 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/21:10438130

Výsledek na webu

<a href="https://www.mdpi.com/2075-4701/11/3/473/htm" target="_blank" >https://www.mdpi.com/2075-4701/11/3/473/htm</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/met11030473" target="_blank" >10.3390/met11030473</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg-Li Metal-Matrix Composites

Popis výsledku v původním jazyce

Stress-relaxation tests were performed during plastic deformation at room temperature of three magnesium Mg-Li alloys reinforced with 10 vol% of short Saffil fibers. For comparison, the composite with the Mg matrix was studied. The time dependencies of the stress decrease were analyzed with the aim to determine the activation volume and the main types of thermally activated processes occurring during plastic flow. The Mg4Li matrix alloy exhibited the hcp structure, while the composite with the Mg12Li matrix alloy had the bcc structure. The third alloy, Mg8Li, combined both phases, hcp and bcc. The stress acting in the matrix was divided into two components: the internal stress and the effective stress. Activation volume and stress-sensitivity parameters were determined as a function of effective stress and strain. While the values of the activation volume depending on the effective stress lay on one "master" curve, the strain dependence was different for all materials. The main thermally activated process in the hcp structure was the dislocation motion in the noncompact planes, while in the bcc structure, massive recovery processes connected with an increase in dislocations were identified.

Název v anglickém jazyce

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg-Li Metal-Matrix Composites

Popis výsledku anglicky

Stress-relaxation tests were performed during plastic deformation at room temperature of three magnesium Mg-Li alloys reinforced with 10 vol% of short Saffil fibers. For comparison, the composite with the Mg matrix was studied. The time dependencies of the stress decrease were analyzed with the aim to determine the activation volume and the main types of thermally activated processes occurring during plastic flow. The Mg4Li matrix alloy exhibited the hcp structure, while the composite with the Mg12Li matrix alloy had the bcc structure. The third alloy, Mg8Li, combined both phases, hcp and bcc. The stress acting in the matrix was divided into two components: the internal stress and the effective stress. Activation volume and stress-sensitivity parameters were determined as a function of effective stress and strain. While the values of the activation volume depending on the effective stress lay on one "master" curve, the strain dependence was different for all materials. The main thermally activated process in the hcp structure was the dislocation motion in the noncompact planes, while in the bcc structure, massive recovery processes connected with an increase in dislocations were identified.

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

2021

Kód důvěrnosti údajů

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

Název periodika

METALS

ISSN

2075-4701

e-ISSN

2075-4701

Svazek periodika

11

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

13

Strana od-do

nestránkováno

Kód UT WoS článku

000633872600001

EID výsledku v databázi Scopus

2-s2.0-85102378179