Publication detail

Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP

PANTĚLEJEV, L. ŠTĚPÁNEK, R. MAN, O.

Czech title

Teplotní stabilita hořčíkové slitiny AZ91 s bimodální strukturou připravené pomocí ECAP procesu

English title

Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP

Type

journal article in Web of Science

Language

en

Original abstract

The changes in microstructure of equal channel angular pressing (ECAP) processed magnesium alloy AZ91 during thermal exposure were studied in this paper. The microstructure stability was investigated by means of electron backscatter diffraction (EBSD), which allowed measuring the changes in grain size, mutual ratio of low-angle boundaries (LABs) to high-angle ones (HABs) and local lattice distortion evaluated by the kernel average misorientation (KAM) parameter. It was found experimentally that the threshold temperature at which significant grain coarsening takes place is 350 centigrade. No modification to mean grain diameter occur below this temperature, nonetheless, some changes in LAB and HAB fraction, as well as in local lattice distortion, can be observed.

Czech abstract

Článek popisuje výsledky zkoumání mikrostrukturní stability v podmínkách zvýšené teploty hořčíkové slitiny AZ91 připravené pomocí metody ECAP. Mikrostrukturní stabilita byla zkoumána pomocí metody EBSD, která umožňuje zachycení změn velikosti zrn, změn vzájemného poměru LAB a HAB a lokální distorze krystalové mřížky pomocí parametru KAM . BYlo experimentálně zjištěno, že prahová hodnota teploty kdy dochází k významnému hrubnutí zrn je 350 stupnu Celsia. Pod touto teplotou nedochází ke změně střední velikosti zrna, nicméně dochází ke změnám v poměru mezi vysokoúhlovými a nízkoúhlovými hranicemi. Stejně tak bylo možno pozorovat změny v lokální distorzi krystalové mřížky.

English abstract

The changes in microstructure of equal channel angular pressing (ECAP) processed magnesium alloy AZ91 during thermal exposure were studied in this paper. The microstructure stability was investigated by means of electron backscatter diffraction (EBSD), which allowed measuring the changes in grain size, mutual ratio of low-angle boundaries (LABs) to high-angle ones (HABs) and local lattice distortion evaluated by the kernel average misorientation (KAM) parameter. It was found experimentally that the threshold temperature at which significant grain coarsening takes place is 350 centigrade. No modification to mean grain diameter occur below this temperature, nonetheless, some changes in LAB and HAB fraction, as well as in local lattice distortion, can be observed.

Keywords in Czech

Mikrostrukturní stabilita, hořčíková slitina AZ91, bezkontrakční úhlové protlačování (ECAP), střední jádrová dezorientace (KAM), EBSD

Keywords in English

Microstructural stability, AZ91 magnesium alloy, Equal channel angular pressing (ECAP), Kernel average misorientation (KAM), Electron backscatter diffraction (EBSD)

RIV year

2015

Released

09.07.2015

Publisher

Elsevier

ISSN

1044-5803

Volume

107

Number

9

Pages from–to

167–173

Pages count

7

BIBTEX


@article{BUT111291,
  author="Libor {Pantělejev} and Roman {Štěpánek} and Ondřej {Man},
  title="Thermal stability of bimodal microstructure in magnesium alloy AZ91 processed by ECAP",
  year="2015",
  volume="107",
  number="9",
  month="July",
  pages="167--173",
  publisher="Elsevier",
  issn="1044-5803"
}