Abstract
In the present work, the microstructure and texture of a Mg–6.8Y–2.5Zn–0.4Zr sheet manufactured by twin-roll casting were investigated. The twin-roll cast state consisted of two apparent phases: the α-Mg matrix, which was made up of dobulites with an average grain size of approximately 50 µm and the LPSO (long-period stacking ordered) phase, which formed network-like precipitates along the grain boundaries. After twin-roll casting, annealing was carried out under conditions of different temperatures ranging from 450 °C to 525 °C and holding times between 2 h and 24 h. It was found that heat treatment led to the formation of a microstructure in which grains were apparent. Furthermore, it could be observed that high temperatures > 500 °C led to changes in the morphology of the LPSO structures. On one hand, the network-like structure dissolved while, on the other hand, both rodlike and blocky LPSO phases precipitated predominantly at the grain boundaries of the α-Mg matrix. This process was fostered by high temperatures and long holding times.
Highlights
Magnesium alloys are often associated with low strength and insufficient ductility
Starting points for kink bands are areas with increased local stress levels, such as pores or inclusions [15]. Another explanation for these superior mechanical properties is that a Mg–Y–Zn alloy with an LPSO phase is generally regarded as a two-phase material consisting of hard LPSO plates embedded in a soft Mg matrix
Twin-roll casting of the WZ73 alloy led to the formation of a two-phase microstructure consisting of an α-magnesium matrix, which was made up of dobulites with an average grain size of approximately
Summary
Magnesium alloys are often associated with low strength and insufficient ductility. research efforts in the development of new magnesium alloys have shown that by adding rare earth elements, alloys with excellent mechanical properties can be obtained [1]. Starting points for kink bands are areas with increased local stress levels, such as pores or inclusions [15] Another explanation for these superior mechanical properties is that a Mg–Y–Zn alloy with an LPSO phase is generally regarded as a two-phase material consisting of hard LPSO plates embedded in a soft Mg matrix. Twin-roll casting of a Mg–Y–Zn magnesium alloy was applied to obtain thin sheets with a fine dendritic microstructure of α-Mg and LPSO phases. Heat treatment was carried out after twin-roll casting in order to investigate the influence of different temperature and time regimes on the microstructure and the resulting texture
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