Abstract
Deformation of an as-rolled rare earth Mg-2Y-0.6Nd-0.6Zr alloy, at different temperatures, was carried out along the BC (90° anticlockwise rotation of the samples after each ECAP pass) route by equal channel angular pressing (ECAP). The effects of the deformation temperature and the predeformation on the microstructure of the magnesium alloy were determined by the microstructure examination. The slip systems and texture change of the Mg-2Y-0.6Nd-0.6Zr alloy were investigated by X-ray diffraction (XRD) and electron backscattered diffraction (EBSD), after equal channel angular deformation. The results showed that after seven passes of rolling, the grain size in the Mg-2Y-0.6Nd-0.6Zr alloy was refined to approximately 22 µm and the slip occurred mainly by a cylindrical slip and a pyramidal slip. After one pass of ECAP at 340 °C, the internal average grain size was significantly reduced to 11 µm, the cylindrical diffraction intensity clearly weakened, and the pyramidal diffraction intensity increased. EBSD pole figure analysis revealed that the base texture of the rolled Mg-2Y-0.6Nd-0.6Zr alloy weakened from 24.31 to 11.34 after ECAP. The mechanical properties indicated that the tensile strength and elongation of the rolled Mg-2Y-0.6Nd-0.6Zr alloy reached maximum values, when the deformation temperature was 340 °C.
Highlights
In recent years, to reduce energy consumption and environmental pollution caused by transportation, applications of new magnesium alloys, at high temperatures, have been studied by many researchers
The microstructure analyses were conducted on the planes perpendicular to the transverse direction
When the rolling tempe was 360 °C, cracks appeared on the surface of the sample, and the surface quality was poor
Summary
To reduce energy consumption and environmental pollution caused by transportation, applications of new magnesium alloys, at high temperatures, have been studied by many researchers. The machining temperature of magnesium alloy is usually higher than 200 ◦ C [5,6], which causes grain growth and a lower strength, due to the large grains. It is important to improve the plasticity of magnesium alloys and their comprehensive properties [7,8,9,10]. Rare earth Mg alloys exhibit good strength and good creep resistance [11]. Rare earth magnesium alloys show an improved high temperature performance, compared to conventional magnesium alloys, and are able to withstand service temperatures up to ~250 ◦ C [12]. Avvari et al [13]
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