TEM observation of twins in surface grains of superelastic NiTi wire after cyclic loading

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F20%3A00538888" target="_blank" >RIV/68378271:_____/20:00538888 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/20:10422440

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0921509320303543" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0921509320303543</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2020.139271" target="_blank" >10.1016/j.msea.2020.139271</a>

Result language

angličtina

Original language name

TEM observation of twins in surface grains of superelastic NiTi wire after cyclic loading

Original language description

Since the surface dominates fatigue of medical grade NiTi wire by yet unexplained causes, for comparison, we carried out a TEM observation of surface grains, both after one thousand superelastic cycles and on the unloaded wire. Crystallographic defects consisting of aggregates of austenite twins stacked in the bands were observed after cycling deformation. The nuclei of aggregates are already present in an unloaded wire that originates from cold drawing or heat treatment. Severe plastic deformation induced by a stress increasing in the surface during a cyclic phase transformation enables an accumulation of these aggregates into bands at inclined angle of 55° to the wire axis corresponding to the spreading of diffused martensite band front paths during their propagation. An unrecovered strain, suppression of transformation and acceleration of crack propagation can be expected while the aggregates grow.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

<a href="/en/project/EF15_006%2F0000674" target="_blank" >EF15_006/0000674: HiLASE Centre of Excellence</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Materials Science and Engineering A-Structural materials

ISSN

0921-5093

e-ISSN

—

Volume of the periodical

782

Issue of the periodical within the volume

Apr

Country of publishing house

CH - SWITZERLAND

Number of pages

6

Pages from-to

1-6

UT code for WoS article

000525797900019

EID of the result in the Scopus database

2-s2.0-85082175789