Thermal stability and microstructure development of cast and powder metallurgy produced Mg-Y-Zn alloy during heat treatment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10369015" target="_blank" >RIV/00216208:11320/17:10369015 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2213956717300257?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2213956717300257?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jma.2017.05.004" target="_blank" >10.1016/j.jma.2017.05.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal stability and microstructure development of cast and powder metallurgy produced Mg-Y-Zn alloy during heat treatment

Popis výsledku v původním jazyce

Response to isochronal annealing up to 440 °C of squeeze cast Mg-Y-Zn alloy and of the same alloy prepared by powder metallurgy (PM) and extruded at 280 °C was studied by resistivity and microhardness measurement, differential scanning calorimetry (DSC) and microstructure investigation. Electrical resistivity was measured at 77 K and microhardness was measured at room temperature after each annealing step. DSC measurement was performed at various heating rates. Transmission and scanning electron microscopy and optical microscopy revealed ribbons of long-period ordered structure (LPSO) 18R and planar defects within grain boundaries. Relatively high density of planar defects was found in grain interiors of the cast alloy with the grain size approximately 50 µm. Well pronounced subgrains were observed in the PM prepared alloy. Secondary phase particles decorate grain boundaries in this alloy. Three precipitation processes were detected in the cast alloy during repeated isochronal annealing up to 440 °C, whereas only one significant process was revealed in the PM alloy. These processes were identified as embedding of stacking faults by solutes, development and rearrangement (18R RIGHTWARDS ARROW 14H) of LPSO phase and development of grain boundary particles. A coarsening of grain boundary particles rich in Y and Zn only proceeds in the PM alloy. Activation energies of the precipitation processes were determined. Microhardness exhibits good thermal stability against annealing up to 360 °C in the PM alloy.

Název v anglickém jazyce

Thermal stability and microstructure development of cast and powder metallurgy produced Mg-Y-Zn alloy during heat treatment

Popis výsledku anglicky

Response to isochronal annealing up to 440 °C of squeeze cast Mg-Y-Zn alloy and of the same alloy prepared by powder metallurgy (PM) and extruded at 280 °C was studied by resistivity and microhardness measurement, differential scanning calorimetry (DSC) and microstructure investigation. Electrical resistivity was measured at 77 K and microhardness was measured at room temperature after each annealing step. DSC measurement was performed at various heating rates. Transmission and scanning electron microscopy and optical microscopy revealed ribbons of long-period ordered structure (LPSO) 18R and planar defects within grain boundaries. Relatively high density of planar defects was found in grain interiors of the cast alloy with the grain size approximately 50 µm. Well pronounced subgrains were observed in the PM prepared alloy. Secondary phase particles decorate grain boundaries in this alloy. Three precipitation processes were detected in the cast alloy during repeated isochronal annealing up to 440 °C, whereas only one significant process was revealed in the PM alloy. These processes were identified as embedding of stacking faults by solutes, development and rearrangement (18R RIGHTWARDS ARROW 14H) of LPSO phase and development of grain boundary particles. A coarsening of grain boundary particles rich in Y and Zn only proceeds in the PM alloy. Activation energies of the precipitation processes were determined. Microhardness exhibits good thermal stability against annealing up to 360 °C in the PM alloy.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

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

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Magnesium and Alloys [online]

ISSN

2213-9567

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CN - Čínská lidová republika

Počet stran výsledku

8

Strana od-do

173-180

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85038882248