Effect of Rotary Swaging on Microstructure, Texture, and Mechanical Properties of a Mg‐Al‐Zn Alloy

Abstract

The effect of rotary swaging on the microstructure, texture, and mechanical properties of the magnesium alloy Mg‐4.4Al‐0.9Zn‐0.4Mn is studied. Repetitive processing, conducted at progressively dropped deformation temperature (from 400 down to 200 °C), leads to an increase in the cumulative strain ε. Rotary swaging of the alloy is shown to lead to microstructure fragmentation due to intensive twinning on various crystallographic planes. A high density of twins observed at the final stage of deformation, at ε = 2.77, leads to a decrease in the distance between boundaries (including both twins and grain boundaries) to ≈3 μm. With decreasing temperature, 0.2‐μm‐wide secondary deformation twins form within the primary twins with a width in the range of 1.5–2.5 μm. The texture analysis shows that, upon deformation, the number of orientations increases as does their scatter. Rotary swaging at 350 °C to ε = 2.77 gives rise to an increase of both strength and tensile ductility of the alloy. The high strength characteristics are achieved due to the formation of a subgrain structure and profuse twinning. The increased tensile ductility is associated with the activation of prismatic slip in addition to developed basal slip.

The Effect of Equal-Channel Angular Pressing on the Microstructure, the Mechanical and Corrosion Properties and the Anti-Tumor Activity of Magnesium Alloyed with Silver

“…should be explored. In addition, extra deformation processing steps, for example, rotary swaging [41,42] carried out after ECAP may be a viable pathway to achieving the desired combination of properties. We intend to continue such investigations of the mechanical and biological properties of magnesium alloys, as well as the possibility of their modification in various ways.…”

Enhanced Mechanical and Corrosion Performance by Forming Micro Shear Bands in Cold Forged Mg-Gd-Y-Zr Alloy

“…In addition, quantitative understanding of the underlying strengthening mechanism of cold deformed Mg alloy is of significant importance. For Mg and Mg alloys, cold deformations are mostly carried out via various kinds of forging, such as rotary swaging [ 6 , 7 , 8 ] and multi-directional forging [ 5 , 9 ]. Because the triaxial compressive stress condition of forging could help reduce crack and the strain rate can be better controlled, compared with rolling and extrusion.…”

Nano-Gradient Materials Prepared by Rotary Swaging

“…In addition, both the RSed pieces exhibited the presence of residual stress in the peripheral areas of W agglomerates. However, in HCP metals, the effect of temperature on RS is significant [79]. Estrin et.…”

“…In addition, both the RSed pieces exhibited the presence of residual stress in the peripheral areas of W agglomerates. However, in HCP metals, the effect of temperature on RS is significant [ 79 ]. Estrin et al demonstrated the viability of the processing of Mg–4.4%Al–0.9%Zn–0.4%Mn alloy prepared by RS with concurrent temperature drops (from 400 down to 200 °C) and found that the decreasing of temperature leads to more strain accumulation, induces secondary deformation twins form within the primary twins and exacerbates the dispersion of textures [ 79 ].…”