Microstructure and creep properties of MEZ magnesium alloy processed by thixocasting
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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Magnesium Technology 2012 - Held During TMS 2012 Annual Meeting and Exhibition. ed. / Suveen N. Mathaudhu; Wim H. Sillekens; Neale R. Neelameggham; Nobert Hort. Cham: Springer Schweiz, 2012. p. 385-389 (Magnesium Technology).
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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TY - CHAP
T1 - Microstructure and creep properties of MEZ magnesium alloy processed by thixocasting
AU - Morales Garza, Emma D.
AU - Dieringa, Hajo
AU - Hort, Norbert
AU - Kainer, Karl U.
N1 - Conference code: 141
PY - 2012
Y1 - 2012
N2 - Whereas in most magnesium applications die casting is the dominant manufacturing process, thixocasting recently came into focus of producers. This is mainly due to the improved microstructure, reduced porosity and better mechanical properties. An important issue for the introduction and use of magnesium alloys in automotive industry is their creep resistance. Aluminum free magnesium alloys are known to show improved creep strength compared to conventional aluminum containing alloys due to the absence of beta phase (Mg 17Al 12). MEZ alloy (Mg-RE-Zn-Zr) shows better creep resistance even compared to AE42 in die casting. In this paper, the mechanical and creep properties from thixocast MEZ alloy are evaluated from creep tensile tests at temperatures of 135°C, 150°C and 175°C and at stresses between 60 and 100 MPa. The creep activation energy and the stress exponent are calculated and discussed. Optical, scanning and transmission electron microscopy of the microstructural features developed after the mechanical tests helps to understand the deformation mechanisms occurring during creep and to explain the creep properties after thixocasting.
AB - Whereas in most magnesium applications die casting is the dominant manufacturing process, thixocasting recently came into focus of producers. This is mainly due to the improved microstructure, reduced porosity and better mechanical properties. An important issue for the introduction and use of magnesium alloys in automotive industry is their creep resistance. Aluminum free magnesium alloys are known to show improved creep strength compared to conventional aluminum containing alloys due to the absence of beta phase (Mg 17Al 12). MEZ alloy (Mg-RE-Zn-Zr) shows better creep resistance even compared to AE42 in die casting. In this paper, the mechanical and creep properties from thixocast MEZ alloy are evaluated from creep tensile tests at temperatures of 135°C, 150°C and 175°C and at stresses between 60 and 100 MPa. The creep activation energy and the stress exponent are calculated and discussed. Optical, scanning and transmission electron microscopy of the microstructural features developed after the mechanical tests helps to understand the deformation mechanisms occurring during creep and to explain the creep properties after thixocasting.
KW - Creep
KW - MEZ magnesium alloy
KW - Microstructure
KW - Semi-solid processing
KW - Thixocasting
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84860802813&partnerID=8YFLogxK
M3 - Article in conference proceedings
AN - SCOPUS:84860802813
SN - 9781118291214
SN - 978-3-319-48202-6
T3 - Magnesium Technology
SP - 385
EP - 389
BT - Magnesium Technology 2012 - Held During TMS 2012 Annual Meeting and Exhibition
A2 - Mathaudhu, Suveen N.
A2 - Sillekens, Wim H.
A2 - Neelameggham, Neale R.
A2 - Hort, Nobert
PB - Springer Schweiz
CY - Cham
T2 - 141st Annual Meeting and Exhibition of the Magnesium Technology - TMS 2012
Y2 - 11 March 2012 through 15 March 2012
ER -