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Microstructural stability of Mg-5Al-0.4Mn-3RE alloy during annealing

Żydek A., Kamieniak J., Braszczyńska-Malik K. N.

Archives of Foundry Engineering

2011

Vol. 11, iss. 4

163-166

As-cast Mg-5Al-0.4Mn-3RE magnesium alloy was prepared successfully. The microstructure and microstructural stability at 473K were investigated by light microscopy and X-ray diffraction (XRD).The results revealed that the as-cast Mg-5Al-0.4Mn-3RE alloy consists of \delta - Mg matrix, eutectic \delta + \gamma (where \gamma is Mg17Al12), Al11RE3 precipitates and Al10RE2Mn7 phase. After annealing at 473K for 100h and annealing at 473K for 100h after compression with a stress 280 MPa needle shape particles of Al11RE3 remained unchanged due to their relatively high melting point.