An ultrasonic study of relaxation processes in pure and mechanically alloyed tungsten

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F20%3A00537989" target="_blank" >RIV/61388998:_____/20:00537989 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68081723:_____/20:00537989 RIV/61389021:_____/20:00537989 RIV/61389005:_____/20:00537989 RIV/68407700:21340/20:00344890 RIV/00216208:11320/20:10424154

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0263436820301098" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0263436820301098</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijrmhm.2020.105233" target="_blank" >10.1016/j.ijrmhm.2020.105233</a>

Jazyk výsledku

angličtina

Název v původním jazyce

An ultrasonic study of relaxation processes in pure and mechanically alloyed tungsten

Popis výsledku v původním jazyce

High-temperature internal friction in a pure tungsten single crystal, polycrystals with different grain sizes, and mechanically alloyed tungsten polycrystals was studied. Positron annihilation spectroscopy was used to prove that all studied materials contain a detectable amount of dislocations. Then, resonant ultrasound spectroscopy was applied to determine the internal friction evolution with temperature from room temperature up to 740 degrees C. For the pure tungsten samples, a sharp increase of internal friction was observed for temperatures above 470 degrees C (for the single crystal) or above 400 degrees C (for the polycrystals), the activation energy corresponding to this increase was the same as the activation energy for the ductile-to-brittle transition in tungsten reported in the literature. For the alloyed materials, direct observation of the onset of this relaxation mechanism was impossible due to additional effects resulting from the secondary phases in the material.n

Název v anglickém jazyce

An ultrasonic study of relaxation processes in pure and mechanically alloyed tungsten

Popis výsledku anglicky

High-temperature internal friction in a pure tungsten single crystal, polycrystals with different grain sizes, and mechanically alloyed tungsten polycrystals was studied. Positron annihilation spectroscopy was used to prove that all studied materials contain a detectable amount of dislocations. Then, resonant ultrasound spectroscopy was applied to determine the internal friction evolution with temperature from room temperature up to 740 degrees C. For the pure tungsten samples, a sharp increase of internal friction was observed for temperatures above 470 degrees C (for the single crystal) or above 400 degrees C (for the polycrystals), the activation energy corresponding to this increase was the same as the activation energy for the ductile-to-brittle transition in tungsten reported in the literature. For the alloyed materials, direct observation of the onset of this relaxation mechanism was impossible due to additional effects resulting from the secondary phases in the material.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10307 - Acoustics

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

International Journal of Refractory Metals & Hard Materials

ISSN

0263-4368

e-ISSN

—

Svazek periodika

90

Číslo periodika v rámci svazku

August

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

105233

Kód UT WoS článku

000527310900007

EID výsledku v databázi Scopus

2-s2.0-85082173041