Mechanical and thermal properties and corrosion behaviour of heat-treated Mg-Y-Nd-Ag alloys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10404957" target="_blank" >RIV/00216208:11320/19:10404957 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=vt1quo5zux" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=vt1quo5zux</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-019-08782-9" target="_blank" >10.1007/s10973-019-08782-9</a>

Result language

angličtina

Original language name

Mechanical and thermal properties and corrosion behaviour of heat-treated Mg-Y-Nd-Ag alloys

Original language description

The magnesium alloys are promising candidates for biodegradable medical implants which reduce the necessity of second surgery to remove the implants. Yttrium in solid solution is an attractive alloying element because it improves mechanical properties and exhibits suitable corrosion properties. Silver was shown to have an antibacterial effect. The effect of Y and Nd solutes on the corrosion, mechanical and thermal properties of Mg-4Y-2Nd-1Ag (in mass%) and Mg-2Y-1Nd-1Ag (in mass%) alloys prepared by gravity casting has been investigated. The alloys were isothermally annealed at two temperatures: 500 degrees C/24 h and 525 degrees C/24 h. Microhardness (HV 0.1) together with differential scanning calorimetry measurements were compared to microstructure development that was observed by transmission and scanning electron microscopy. Corrosion behaviour was studied by using electrochemical measurements and hydrogen evolution test. In the Mg-4Y-2Nd-1Ag alloy annealed at 500 degrees C/24 h, one exothermic process was observed; in the Mg-4Y-2Nd-1Ag alloy annealed at 525 degrees C/24 h, two exothermic processes were observed. The activation energies of these processes were calculated by Kissinger method as similar to 140 kJ mol(-1) for the alloy annealed at 500 degrees C/24 h and similar to 115 kJ mol(-1) and similar to 120 kJ mol(-1) for the alloy annealed at 525 degrees C/24 h. No thermal processes were observed in the Mg-2Y-1Nd-1Ag alloys. The results showed that the alloys with the lower amount of Y and Nd solutes exhibit considerably higher corrosion resistance. Unlike in the Mg-2Y-1Nd-1Ag alloy, the corrosion rate of the Mg-4Y-2Nd-1Ag in physiological environment increases with the time of immersion. It was found that isothermal heat treatments lead to an improvement of corrosion properties in both studied alloys but affect microhardness only moderately.

Czech name

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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

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/GA16-12828S" target="_blank" >GA16-12828S: Defect-assisted early precipitation stages in lightweight hardenable alloys</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

—

Volume of the periodical

138

Issue of the periodical within the volume

3

Country of publishing house

HU - HUNGARY

Number of pages

8

Pages from-to

2167-2174

UT code for WoS article

000494046600030

EID of the result in the Scopus database

2-s2.0-85073957183