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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GA16-12828S" target="_blank" >GA16-12828S: Vliv defektů na raná stadia precipitace v lehkých vytvrditelných slitinách</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

—

Svazek periodika

138

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

8

Strana od-do

2167-2174

Kód UT WoS článku

000494046600030

EID výsledku v databázi Scopus

2-s2.0-85073957183