Grain orientation dependence of the forward and reverse fcc <-> hcp transformation in FeMnSi-based shape memory alloys studied by in situ neutron diffraction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F20%3A00535125" target="_blank" >RIV/68081723:_____/20:00535125 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0921509320303440?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921509320303440?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2020.139261" target="_blank" >10.1016/j.msea.2020.139261</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Grain orientation dependence of the forward and reverse fcc <-> hcp transformation in FeMnSi-based shape memory alloys studied by in situ neutron diffraction

Popis výsledku v původním jazyce

The grain orientation dependence of the deformation-induced forward fcc -> hcp and reverse hcp -> fcc martensite transformation of a FeMnSi-based shape memory alloy was studied by in situ neutron diffraction during cyclic loading. A deformation-induced fcc -> hcp transformation is observed during tensile straining to +2%. The hcp martensite phase that forms under tension partially reverts to fcc austenite upon subsequent compression from +2% -> -2% for the {220}, {331} and {111} grain families aligned with respect to the loading direction but not for the {200} grain family. The martensite formation and the reversion of the individual grains can be explained by considering grain orientation dependent Schmid factors of the {111}< 112 > slip system underlying the fcc to hcp transformation. While for post-yield elastically compliant grains the Schmid factor of the leading partial dislocation is larger than that of the trailing partial dislocation, the opposite is true for post-yield elastically stiff grains. The former grains show a phase reversion, i.e. hcp -> fcc upon compression, the latter grains do not transform back to fcc. EBSD characterization confirms the phase reversion for a < 541 > orientated grain by the disappearance of hcp bands. Martensite bands, which have not reverted to austenite during compression, showed a thickening. The thickening of existing bands during compression is associated with the activation of a second slip system.

Název v anglickém jazyce

Grain orientation dependence of the forward and reverse fcc <-> hcp transformation in FeMnSi-based shape memory alloys studied by in situ neutron diffraction

Popis výsledku anglicky

The grain orientation dependence of the deformation-induced forward fcc -> hcp and reverse hcp -> fcc martensite transformation of a FeMnSi-based shape memory alloy was studied by in situ neutron diffraction during cyclic loading. A deformation-induced fcc -> hcp transformation is observed during tensile straining to +2%. The hcp martensite phase that forms under tension partially reverts to fcc austenite upon subsequent compression from +2% -> -2% for the {220}, {331} and {111} grain families aligned with respect to the loading direction but not for the {200} grain family. The martensite formation and the reversion of the individual grains can be explained by considering grain orientation dependent Schmid factors of the {111}< 112 > slip system underlying the fcc to hcp transformation. While for post-yield elastically compliant grains the Schmid factor of the leading partial dislocation is larger than that of the trailing partial dislocation, the opposite is true for post-yield elastically stiff grains. The former grains show a phase reversion, i.e. hcp -> fcc upon compression, the latter grains do not transform back to fcc. EBSD characterization confirms the phase reversion for a < 541 > orientated grain by the disappearance of hcp bands. Martensite bands, which have not reverted to austenite during compression, showed a thickening. The thickening of existing bands during compression is associated with the activation of a second slip system.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10101 - Pure mathematics

Projekt

—

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 Science and Engineering A-Structural materials

ISSN

0921-5093

e-ISSN

—

Svazek periodika

782

Číslo periodika v rámci svazku

APR

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

11

Strana od-do

139261

Kód UT WoS článku

000525797900009

EID výsledku v databázi Scopus

2-s2.0-85081665020