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1 Zeszyty Naukowe. Mechanika / Politechnika Opolska

1 2010

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Effect of heat treatment on mechanical properties of magnesium alloy AZ61

Dolezal P., Zapletal J., Gejdos P.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2010

z. 97

49-50

The contribution is focussed on the assessment of the influence of a heat treatment of magnesium alloy AZ61 on its mechanical properties. The magnesium alloy AZ61 was manufactured by squeeze casting method using alternative two-stage casting. Metallographic analysis was made by means of light and electron microscopy utilising also the possibility of local chemical analyses. The assessment of the influence of a heat treatment on mechanical properties of AZ61 magnesium alloy was performed by means of tensile tests on specimens of rational geometry. The heat treatment of the bars was performed at the temperature of 380 °C and with dwell from 1 to 16 hours to result in T4 (solution annealed) state. Basic stress and strain characteristics were assessed from the results of the tensile tests. It follows from the experimental results that the tensile strength and deformation characteristics grow even after only 1 hour of dwell at the temperature of 380 °C. Maximum values of tensile strength and deformation characteristics were achieved after 6 hour dwell at the temperature. It was confirmed by the metallographic analysis of the test specimens that there occurs the dissolution of the hard and brittle Mg17Al12 intermetallic phase. It was found by the local chemical analysis that the decrease in micro-heterogeneity of the ä solid solution takes place here at the same time. The increase in the tensile strength and deformation characteristics is caused by the dissolution of the hard and brittle intermetallic phase and by the decrease in heterogeneity of the matrix.