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The Mg–1Zn–xSr (x=0.2, 0.5, 0.8 and 1wt.%) alloys have been prepared by zone purifying solidification followed by backward extrusion (BE). The grain size was reduced and the hardness was improved with the increased concentration of strontium (Sr) after backward extrusion. The BE–Mg–1Zn–0.8Sr alloy was mostly composed of fine precipitates (MgZn and Mg 17 Sr 2 ) and Mg matrix. At the...
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