Abstract
The effect of strontium content on the tensile properties of squeeze cast Mg–Al–Sr alloy was investigated. Three strontium contents, 0, 1·5 and 3·0 wt-%, were added to a Mg–6Al alloy (AM60 alloy) which was squeeze cast under an applied pressure of 30 MPa. Tensile test results indicated that the ultimate tensile strength, yield stress and elongation of the squeeze cast Mg–Al–Sr alloy decreased with increasing strontium content. Microstructural analysis indicated that Sr content influenced a number of phases present in the squeeze cast alloys. Also, the grain size of the alloys was observed to decrease with increasing strontium content. It is proposed that an increase in porosity following Sr addition, which appears to offset its grain refinement effect, is responsible for the decrease in tensile properties.
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