Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F14%3A43898120" target="_blank" >RIV/60461373:22310/14:43898120 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.intermet.2013.12.013" target="_blank" >http://dx.doi.org/10.1016/j.intermet.2013.12.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.intermet.2013.12.013" target="_blank" >10.1016/j.intermet.2013.12.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments

Popis výsledku v původním jazyce

In this study, the nano-crystalline Nitinol (50.9 at.% Ni) was prepared by 40% cold deformation. Subsequently it was subjected to 15-min-heat treatments at 300-550 degrees C. Changes of the structure and mechanical properties were studied by transmissionelectron microscopy, micro X-ray diffraction, differential scanning calorimetry, Vickers hardness measurements, tensile and bend-type fatigue testing. It was shown that the cold drawn material contains textured nano-crystalline B2 grains of 50 nm in thickness and a high concentration of lattice defects. Its tensile strength, hardness and fatigue life were 1521 MPa, 421 HV0.05 and 2435 bending cycles to fracture, respectively. After heat-treatment up to 450 degrees C/15 mm the material underwent Ni4Ti3precipitation and partial recovery processes. Heat-treatments at above 450 degrees C induced recrystallization, grain and precipitate growth. Hardness and fatigue lives showed maxima of 692 HV0.05 and 5883 cycles, respectively, after heat

Název v anglickém jazyce

Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments

Popis výsledku anglicky

In this study, the nano-crystalline Nitinol (50.9 at.% Ni) was prepared by 40% cold deformation. Subsequently it was subjected to 15-min-heat treatments at 300-550 degrees C. Changes of the structure and mechanical properties were studied by transmissionelectron microscopy, micro X-ray diffraction, differential scanning calorimetry, Vickers hardness measurements, tensile and bend-type fatigue testing. It was shown that the cold drawn material contains textured nano-crystalline B2 grains of 50 nm in thickness and a high concentration of lattice defects. Its tensile strength, hardness and fatigue life were 1521 MPa, 421 HV0.05 and 2435 bending cycles to fracture, respectively. After heat-treatment up to 450 degrees C/15 mm the material underwent Ni4Ti3precipitation and partial recovery processes. Heat-treatments at above 450 degrees C induced recrystallization, grain and precipitate growth. Hardness and fatigue lives showed maxima of 692 HV0.05 and 5883 cycles, respectively, after heat

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/GBP108%2F12%2FG043" target="_blank" >GBP108/12/G043: Mikro- a nanokrystalické materiály s vysokým podílem rozhraní pro moderní strukturní aplikace, biodegradabilní implantáty a uchovávání vodíku</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Intermetalics

ISSN

0966-9795

e-ISSN

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Svazek periodika

49

Číslo periodika v rámci svazku

červen

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

7-13

Kód UT WoS článku

000334085800002

EID výsledku v databázi Scopus

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