Effects of Al and Zn additions on mechanical properties and precipitation behaviors of Mg-Sn alloy system |
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Authors: | Hyeon-taek SonJong-beom Lee Ha-guk JeongToyohiko J. Konno |
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Affiliation: | a Automotive Components R&D Group, Korea Institute of Industrial Technology, Gwangju 500 -480, Republic of Koreab Eco Materials & Processing R&D Group, Korea Institute of Industrial Technology, Incheon 406 -840, Republic of Koreac Institute for Materials Research, Tohoku University, Sendai 980 -8577, Japan |
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Abstract: | For the Mg-Sn-Al alloys, the ultimate strength (UTS) of an extruded Mg-9wt.%Al-2wt.%Sn alloy reached 390 MPa. TEM observation indicated that plate-like Mg17Al12 precipitates having Burgers orientation relationship with the matrix are responsible for the strength. This alloy also exhibits an age hardening behavior: the peak hardness appears after 15-20 h of heat treatment at 473 K. On the other hand, the UTS of the Mg-Mg-Sn-Zn alloys are on the order of 300 MPa. The precipitates in these alloys are composed of the Mg2Sn and MgZn2 particles. It was found that these phases often precipitate together, suggesting that the MgZn2 phase can act as a nucleation sites for Mg2Sn. |
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Keywords: | Elastic properties Intermetallic alloys and compounds Metals and alloys Microstructure |
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