Enhanced precipitation hardening of Mg–Ca alloy by Al addition

Enhanced precipitation hardening of Mg–Ca alloy by Al addition

We report the enhanced precipitation-hardening response of Mg–0.5Ca (wt.%) alloy by microalloying with Al. The peak hardness of 50 HV for the binary alloy was enhanced to 72 HV in a ternary Mg–0.5Ca–0.3Al alloy. Transmission electron microscopy and 3D atom probe analyses confirmed that the improveme...

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Veröffentlicht in:Scripta materialia 2010-10, Vol.63 (8), p.831-834
Hauptverfasser: Jayaraj, J., Mendis, C.L., Ohkubo, T., Oh-ishi, K., Hono, K.
Format: Artikel
Sprache:eng
Schlagworte:
Aging
Alloying additive
Aluminum
Atom probe analysis
Guinier–Preston zone
Hardness
Magnesium alloys
Magnesium base alloys
Microalloying
Precipitation
Precipitation hardening
Three dimensional
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Zusammenfassung:We report the enhanced precipitation-hardening response of Mg–0.5Ca (wt.%) alloy by microalloying with Al. The peak hardness of 50 HV for the binary alloy was enhanced to 72 HV in a ternary Mg–0.5Ca–0.3Al alloy. Transmission electron microscopy and 3D atom probe analyses confirmed that the improvement in the peak hardness is associated with the dense precipitation of ordered monolayer Guinier–Preston zones and the subsequent formation of Al 2Ca causes the over-aging.
ISSN:1359-6462
1872-8456
1872-8456
DOI:10.1016/j.scriptamat.2010.06.028