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Abstract

Precipitation in a Mg–1·58Mn (wt-%) alloy has been studied by means of transmission electron microscopy and electrical resistivity measurements. During heat treatment between 390 and 530°C only the equilibrium phase α Mn is formed. The precipitates are fine rods parallel to [00.1]_Mg and the three <21̄>_Mg directions. Each of the precipitates has a <111>_Mn parallel to its growth direction and two orientation relationships have been established: (i) {111}_Mn‖{00.1}_Mg and{11̄0}_Mn‖{10.0} and (ii) {111}_Mn‖{11.0}_Mg and {11̄0}_Mn‖{00.01}_Mg. The precipitates are nucleated mainly at dislocations. The precipitation of Mn starts after heat treatment at 500°C for 7 s and is complete after 10 min. The solubility of Mn in Mg increases from 0·22 to 1·43 wt-% at 390 and 570°C, respectively.

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Precipitation in Mg–Mn alloys

Abstract

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References