Fracture toughness of a lamellar orientation-controlled TiAl-based alloy processed by either one-step or two-step compression at high temperature

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00494647" target="_blank" >RIV/68081723:_____/18:00494647 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26210/18:PU140278

Result on the web

<a href="http://dx.doi.org/10.1016/j.msea.2018.02.079" target="_blank" >http://dx.doi.org/10.1016/j.msea.2018.02.079</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.msea.2018.02.079" target="_blank" >10.1016/j.msea.2018.02.079</a>

Result language

angličtina

Original language name

Fracture toughness of a lamellar orientation-controlled TiAl-based alloy processed by either one-step or two-step compression at high temperature

Original language description

In this work, the effects of lamellae orientation and the distribution of fine grains and fine lamellar colonies on the fracture toughness of orientation-controlled Ti-43 mol%Al alloy were examined. Fracture toughness was determined by three-point bending tests following the introduction of a chevron notch, and thermomechanical processing to control lamellar orientation consisted of high temperature compression in the a single-phase and (alpha + gamma) two-phase regions. Materials processed via one-step compression in the a single-phase region exhibited tilting of the lamellae interface by approximately 20-30 degrees relative to the compression plane. Further compression in the (alpha + gamma) two-phase region (termed two-step compression) arranged the lamellae interface nearly parallel to the compression plane. Fine grains were also observed around the orientation-controlled lamellar colonies, and were converted into fine lamellar colonies during heat treatment following processing in the (alpha + gamma) two-phase region. The proportion of fine grains decreased with an increase in the true strain rate during compression in the (alpha + gamma) two-phase region. Specimens processed by one-step compression had fracture toughness values lower than those of two-step compression specimens. In addition, specimens processed using two-step compression and exhibiting a crack arrester orientation had higher fracture toughness values than those with a crack divider orientation. The fine grains and colonies formed at the lamellar colony boundaries were found not to affect the fracture toughness of specimens with either of these crack orientations. However, decreased quantities of fine grains and colonies may increase the toughness of specimens for which crack propagation occurs in conjunction with crack arrester orientation.

Czech name

—

Czech description

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Type

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

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/GA17-13573S" target="_blank" >GA17-13573S: Architectured metallic materials designed for cold spray kinetization</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

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

721

Issue of the periodical within the volume

APR

Country of publishing house

CH - SWITZERLAND

Number of pages

8

Pages from-to

303-310

UT code for WoS article

000430763300033

EID of the result in the Scopus database

2-s2.0-85042859587