Abstract
In recent years, magnesium alloys have been received much attention as important structural materials for lightweight components in automotive, electronic and space industries because of the low density, high specific strength, high damping capacities and good casting properties. Among various magnesium alloys, rare earth (RE) containing alloys are known to show high strength, excellent creep resistance, and good thermal stability. Long period stacking ordered structures (LPSO) being responsible for the improved property profile in some Mg–RE alloys. One promising system are the Mg-Y-Zn alloys, which are predominantly processed via extrusion. Only a few studies are focused on hot rolling. However, these works are confined to rolling temperatures between 350 °C and 420 °C. The present paper summarizes the development of a rolling technique including pass schedule and heat treatment for the magnesium alloy Mg-6.8Y-2.5Zn-0.5Al in as-cast condition in order to produce sheets with a final thickness of 2.5 mm. The investigations are accompanied by the characterization of the microstructure as well as the determination of the mechanical properties.
Highlights
AZ31 is the most commonly used magnesium wrought alloy and provides formability, which allows processing via forging, extrusion and rolling
The present paper presents the development of a rolling technology including pass schedule and heat treatment for the magnesium alloy Mg-6.8Y-2.5Zn-0.5Al in as-cast condition in order to produce sheets with a final thickness of 2.5 mm, which offers a good property profile
In order to improve the high temperature properties of magnesium alloys, solid solution and precipitation hardening for impeding dislocation movement needs to be promoted
Summary
AZ31 is the most commonly used magnesium wrought alloy and provides formability, which allows processing via forging, extrusion and rolling. Increasing demands on strength require the usage of magnesium alloys containing higher amounts of aluminum (AZ61, AZ80) or zinc (ZK60). Their application is limited by a reduced high-temperature strength, which results from the formation of an eutectic structure during solidification, predominantly along the grain boundaries. The Mg-Mg17Al12 eutectic softens at low temperatures, which leads to a significant decrease of the strength above 120 °C This effect is a result of time-dependent softening processes like dislocation climb or grain boundary sliding. In order to improve the high temperature properties of magnesium alloys, solid solution and precipitation hardening for impeding dislocation movement needs to be promoted. Magnesium alloys containing rare earth elements offer a high amount of thermally stable intermetallic phases having a coherent interface with the matrix and preventing the movement of dislocations [1, 2]
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