Abstract
To clarify the influence of solidification conditions on mechanical properties of unidirectionally solidified AZ91C magnesium alloy, tensile strength, 0.2% proof stress and elongation in tensile test, Brinell hardness, and maximum load, crack initiation energy, crack propagation energy and total absorbed energy in instrumented Sharpy impact test were examined. In as-cast condition, the elongation, proof stress and maximum load are strongly affected by the temperature gradient at solid liquid freezing interface. The moving rate of the freezing interface has significant effects on hardness, crack propagation and total absorbed energy. The average cooling rate during solidification markedly influences crack initiation energy. In T6 condition, the elongation is affected by the temperature gradient and moving rate of the interface. The liquid cooling rate before solidification has effects on proof stress and tensile strength, the moving rate of the interface on hardness and average cooling rate on impact properties.
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