Lattice defects in severely deformed biomedical Ti-6Al-7Nb alloy and thermal stability of its ultra-fine grained microstructure

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F19%3AN0000036" target="_blank" >RIV/26722445:_____/19:N0000036 - isvavai.cz</a>

Alternative codes found

RIV/61389021:_____/19:00502368 RIV/00216208:11320/19:10398949

Result on the web

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0925838819306255" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0925838819306255</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2019.02.173" target="_blank" >10.1016/j.jallcom.2019.02.173</a>

Result language

angličtina

Original language name

Lattice defects in severely deformed biomedical Ti-6Al-7Nb alloy and thermal stability of its ultra-fine grained microstructure

Original language description

Biomedical Ti-6Al-7Nb alloy was prepared by a dedicated thermal treatment followed by equal-channel angular pressing (ECAP) and extrusion. Ultra-fine grained duplex microstructure consisting of deformed primary alpha-grains and fragmented alpha + beta region was achieved. Microstructural changes during heating with the rate of 5 degrees C/min were studied by in-situ electrical resistance. Microstructure after deformation and also after subsequent heating was thoroughly characterized by scanning electron microscopy, X-ray diffraction, and positron annihilation spectroscopy (PAS). X-ray diffraction and positron annihilation spectroscopy proved a very high dislocation density and the presence of high concentration of vacancy clusters in deformed material. The ultra-fine grained microstructure of Ti-6Al-7Nb alloy is stable up to 440 degrees C, while upon heating to 550 degrees C and to 660 degrees C, the dislocation density decreases and vacancy clusters disappear. Enhanced microhardness can be achieved by ECAP followed by aging at 500 degrees C. Upon heating to 660 degrees C, the microhardness decreases due to ongoing recovery and recrystallization. Coincidence Doppler broadening (CDB), a special method of PAS, proved that dislocation cores are preferentially occupied by Al atoms that are known to cause substitutional solid solution strengthening.

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

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace<br>N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2019

Confidentiality

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

Name of the periodical

Journal of Alloys and Compounds

ISSN

0925-8388

e-ISSN

1873-4669

Volume of the periodical

788

Issue of the periodical within the volume

June

Country of publishing house

CH - SWITZERLAND

Number of pages

10

Pages from-to

881-890

UT code for WoS article

000462767000101

EID of the result in the Scopus database

2-s2.0-85062212035