Microstructure and compression creep strength of the newly developed magnesium alloy DieMag422
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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AMI Light Metals Conference 2014. ed. / Ulyate A. Curle; Heinrich Möller. Trans Tech Publications Ltd, 2014. p. 177-183 (Advanced Materials Research; Vol. 1019).
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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TY - CHAP
T1 - Microstructure and compression creep strength of the newly developed magnesium alloy DieMag422
AU - Dieringa, Hajo
AU - Hort, Norbert
AU - Kainer, Karl Ulrich
PY - 2014
Y1 - 2014
N2 - Magnesium alloys have been finding increasingly more types of application in the automotive and aerospace industries for over twenty years. Despite the fact conventional magnesium alloys have limited high-temperature strength and creep resistance, especially when they contain aluminium as an alloying element. Aluminium is necessary to improve the castability when high-pressure die casting is the favoured process. Applications with higher operating temperatures require additional alloy elements, which form precipitates with the aluminium during solidification and therefore prevent the formation of Mg17Al12, which is responsible for the low creep resistance of magnesium alloys that contain aluminium. The precipitates formed may also strengthen grain boundaries and so improve the creep strength. Barium and calcium were investigated as elements in a magnesium alloy containing aluminium (DieMag422: 4 wt.-% Al, 2 wt.-% Ba, 2 wt.-% Ca). The compression creep strength was compared at 240°C for stresses between 60 and 120 MPa with two commercial creep-resistant magnesium alloys, AE42 and MRI230D. The stress exponents were calculated from the stress dependence of the minimum creep rate. The concept of a threshold stress was applied and true stress exponents nt close to 5 were found. The new alloy DieMag422 exhibits improved creep strength compared to both commercial alloys and also has proven it is die castable.
AB - Magnesium alloys have been finding increasingly more types of application in the automotive and aerospace industries for over twenty years. Despite the fact conventional magnesium alloys have limited high-temperature strength and creep resistance, especially when they contain aluminium as an alloying element. Aluminium is necessary to improve the castability when high-pressure die casting is the favoured process. Applications with higher operating temperatures require additional alloy elements, which form precipitates with the aluminium during solidification and therefore prevent the formation of Mg17Al12, which is responsible for the low creep resistance of magnesium alloys that contain aluminium. The precipitates formed may also strengthen grain boundaries and so improve the creep strength. Barium and calcium were investigated as elements in a magnesium alloy containing aluminium (DieMag422: 4 wt.-% Al, 2 wt.-% Ba, 2 wt.-% Ca). The compression creep strength was compared at 240°C for stresses between 60 and 120 MPa with two commercial creep-resistant magnesium alloys, AE42 and MRI230D. The stress exponents were calculated from the stress dependence of the minimum creep rate. The concept of a threshold stress was applied and true stress exponents nt close to 5 were found. The new alloy DieMag422 exhibits improved creep strength compared to both commercial alloys and also has proven it is die castable.
KW - Barium
KW - Calcium
KW - Creep resistance
KW - Die casting
KW - Precipitation strengthening
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84922470464&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.1019.177
DO - 10.4028/www.scientific.net/AMR.1019.177
M3 - Article in conference proceedings
AN - SCOPUS:84922470464
SN - 9783038352341
T3 - Advanced Materials Research
SP - 177
EP - 183
BT - AMI Light Metals Conference 2014
A2 - Curle, Ulyate A.
A2 - Möller, Heinrich
PB - Trans Tech Publications Ltd
T2 - AMI Light Metals Conference 2014
Y2 - 15 October 2014 through 17 October 2014
ER -