Development of the highly corrosion resistant AZ31 magnesium alloy by the addition of a trace amount of Ti

초록

The addition of a trace amount of Ti (<0.01 wt.%) to AZ31 alloy refined the dendritic structure and grain size, supressed the formation of beta phase and promoted the formation of the dense and tight network structure of the divorced eutectic alpha phase with a high aluminium content >= 6.3 wt. % along the grain boundaries and interdendritic interfaces in the as-cast microstructure. This network structure made of Al-rich alpha phase, which resembles the morphology of continuous beta phase structure in the cast AZ91 alloy, significantly enhanced the corrosion resistance of AZ31 alloy by playing a role as an effective barrier to corrosion in NaCl solution. (c) 2015 Elsevier B.V. All rights reserved.

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