The Effect of Different Thermal Treatment on the Allotropic fcc <-> hcp Transformation and Compression Behavior of Polycrystalline Cobalt

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F20%3A00538508" target="_blank" >RIV/61389005:_____/20:00538508 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/20:10421562

Výsledek na webu

<a href="https://doi.org/10.3390/ma13245775" target="_blank" >https://doi.org/10.3390/ma13245775</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ma13245775" target="_blank" >10.3390/ma13245775</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Effect of Different Thermal Treatment on the Allotropic fcc <-> hcp Transformation and Compression Behavior of Polycrystalline Cobalt

Popis výsledku v původním jazyce

Pure polycrystalline cobalt is systematically thermally treated in order to assess the effect of the microstructure on the compression behavior. Isothermal annealing of the as-drawn material leads to recrystallization and grain growth dependent on the annealing temperature (600-1100 degrees C). Consequently, the yield strength decreases and the fracture strain increases as a function of rising grain size. The content of the residual fcc phase is similar to 6-11%. Subsequent thermal cycling around the transition temperature is applied to further modify the microstructure, especially in terms of the fcc phase content. With the increasing number of cycles, the grain size further increases and the fraction of the fcc phase significantly drops. At the same time, the values of both the yield strength and fracture strain somewhat decrease. An atypical decrease in the fracture strain as a function of grain size is explained in terms of decreasing fcc phase content. The stress-induced fcc -> hcp transformation can accommodate a significant amount of plastic strain. Besides controlling basic material parameters (e.g., grain size and texture), adjusting the content of the fcc phase can thus provide an effective means of mechanical performance optimization with respect to particular applications.

Název v anglickém jazyce

The Effect of Different Thermal Treatment on the Allotropic fcc <-> hcp Transformation and Compression Behavior of Polycrystalline Cobalt

Popis výsledku anglicky

Pure polycrystalline cobalt is systematically thermally treated in order to assess the effect of the microstructure on the compression behavior. Isothermal annealing of the as-drawn material leads to recrystallization and grain growth dependent on the annealing temperature (600-1100 degrees C). Consequently, the yield strength decreases and the fracture strain increases as a function of rising grain size. The content of the residual fcc phase is similar to 6-11%. Subsequent thermal cycling around the transition temperature is applied to further modify the microstructure, especially in terms of the fcc phase content. With the increasing number of cycles, the grain size further increases and the fraction of the fcc phase significantly drops. At the same time, the values of both the yield strength and fracture strain somewhat decrease. An atypical decrease in the fracture strain as a function of grain size is explained in terms of decreasing fcc phase content. The stress-induced fcc -> hcp transformation can accommodate a significant amount of plastic strain. Besides controlling basic material parameters (e.g., grain size and texture), adjusting the content of the fcc phase can thus provide an effective means of mechanical performance optimization with respect to particular applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Materials

ISSN

1996-1944

e-ISSN

—

Svazek periodika

13

Číslo periodika v rámci svazku

24

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

13

Strana od-do

5775

Kód UT WoS článku

000605332200001

EID výsledku v databázi Scopus

2-s2.0-85098265493