TY - GEN
T1 - Effect of Sr additions on the microstructure and mechanical properties of Mg-Al-Ca alloys
AU - Suzuki, Akane
AU - Saddock, Nicholas D.
AU - Riester, Laura
AU - Lara-Curzio, Edgar
AU - Jones, J. Wayne
AU - Pollock, Tresa M.
PY - 2006
Y1 - 2006
N2 - The effect of Sr additions on the microstructure and mechanical properties of Mg-Al-Ca alloys was investigated using Mg-5Al-3(Ca, Sr) and Mg-4Al-4(Ca, Sr) quaternary alloys (wt%). The Mg-5Al-3(Ca, Sr) quaternary alloys consist of dendritic α-Mg phase and intermetallic phases, C36-(Mg, Al)2Ca and Mg17Sr2, along the grain boundaries. The formation of the Mg17Sr2 phase was observed in alloys containing more than 0.25wt% Sr. The mechanical properties of these alloys were tested in compression at room temperature and 448 K. At both temperatures, the flow stress decreased with Sr content up to 0.5wt%, and then increased with Sr concentration. The composition of the α-Mg phase measured by EPMA and the hardness and elastic modulus of the α-Mg phase measured by nanoindentation indicate that the latter increase in the flow stress is caused by solid solution strengthening of the α-Mg phase by Al.
AB - The effect of Sr additions on the microstructure and mechanical properties of Mg-Al-Ca alloys was investigated using Mg-5Al-3(Ca, Sr) and Mg-4Al-4(Ca, Sr) quaternary alloys (wt%). The Mg-5Al-3(Ca, Sr) quaternary alloys consist of dendritic α-Mg phase and intermetallic phases, C36-(Mg, Al)2Ca and Mg17Sr2, along the grain boundaries. The formation of the Mg17Sr2 phase was observed in alloys containing more than 0.25wt% Sr. The mechanical properties of these alloys were tested in compression at room temperature and 448 K. At both temperatures, the flow stress decreased with Sr content up to 0.5wt%, and then increased with Sr concentration. The composition of the α-Mg phase measured by EPMA and the hardness and elastic modulus of the α-Mg phase measured by nanoindentation indicate that the latter increase in the flow stress is caused by solid solution strengthening of the α-Mg phase by Al.
KW - Compression test
KW - Nanoindentation
KW - Phase identification
UR - http://www.scopus.com/inward/record.url?scp=33646192384&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33646192384
SN - 0873396200
SN - 9780873396202
T3 - Magnesium Technology
SP - 523
EP - 528
BT - Magnesium Technology
T2 - TMS 2006 Annual Meeting - Magnesium Technology
Y2 - 12 March 2006 through 16 March 2006
ER -