Microstructure and mechanical characterization of cast Mg-Ca-Si alloys
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In: Journal of Alloys and Compounds, Vol. 694, 15.02.2017, p. 767-776.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Microstructure and mechanical characterization of cast Mg-Ca-Si alloys
AU - Gil-Santos, Andrea
AU - Szakacs, Gabor
AU - Moelans, Nele
AU - Hort, Norbert
AU - Van der Biest, Omer
PY - 2017/2/15
Y1 - 2017/2/15
N2 - Three different phase fields are predicted and experimentally detected in the Mg rich corner of the Mg-Ca-Si ternary diagram. The present phases are Mg + MgCaSi + Mg2Si in phase field 1, Mg + MgCaSi in phase field 2 and Mg + Mg2Ca + MgCaSi in phase field 3. The focus of this study is on the formation and evolution of the intermetallic phases. The final microstructures have been related with their solidification process and with the alloys mechanical properties. A clear influence of the observed intermetallic phases on the mechanical performance was found. A bigger size and higher amounts of the MgCaSi intermetallic phase increase the alloys strength and make them brittle, while in its fine morphology MgCaSi reduces the strengthening effect and slightly decreases the ductility compared to pure Mg. Mg2Si phase in its needle-like small size morphology contributes to an increase of the hardness and compressive strength. Its presence reduces the alloys ductility making them brittle. Finally, the highest values for compressive strength and hardness are related to the Mg2Ca presence.
AB - Three different phase fields are predicted and experimentally detected in the Mg rich corner of the Mg-Ca-Si ternary diagram. The present phases are Mg + MgCaSi + Mg2Si in phase field 1, Mg + MgCaSi in phase field 2 and Mg + Mg2Ca + MgCaSi in phase field 3. The focus of this study is on the formation and evolution of the intermetallic phases. The final microstructures have been related with their solidification process and with the alloys mechanical properties. A clear influence of the observed intermetallic phases on the mechanical performance was found. A bigger size and higher amounts of the MgCaSi intermetallic phase increase the alloys strength and make them brittle, while in its fine morphology MgCaSi reduces the strengthening effect and slightly decreases the ductility compared to pure Mg. Mg2Si phase in its needle-like small size morphology contributes to an increase of the hardness and compressive strength. Its presence reduces the alloys ductility making them brittle. Finally, the highest values for compressive strength and hardness are related to the Mg2Ca presence.
KW - Intermetallics
KW - Mechanical properties
KW - Microstructure
KW - Rapid-solidification
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84991720052&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2016.10.059
DO - 10.1016/j.jallcom.2016.10.059
M3 - Journal articles
AN - SCOPUS:84991720052
VL - 694
SP - 767
EP - 776
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -