Mechanical Properties and Resonant Characteristics of Friction Stirred AZ31-Mg Alloy

Abstract

An annealed AZ31-Mg specimen (AZ31-O) was given a FSP (friction stir process) to obtain a AZ31-FSP specimen, whose tensile and vibration fracture mechanisms are examined in this study. As a result of FSP, the structure of the stirred zone (SZ) separated into two zones: (1) the SZ-top had a finer structure and (2) the grain size of the SZ-bottom was like the AZ31-O specimen. Because the basal plane (0002) had pressed close to the trace surface of the onion structure in the SZ, the recrystallization of FSP increased the elongation of the specimens at room temperature, but the refined grains had no contribution to tensile strength and had an unusual Hall-Petch effect. Notably, the vibration deformed resistance of the AZ31-FSP specimen was higher than that of the AZ31-O specimen. The FSP specimen not only possessed finer structures but also had a preferred orientation in the stirred zone. This led to an increase in the crack tortuosity, which in turn increased the crack propagation resistance and the vibration life.

Effects of Friction Stir Process and Stabilizing Heat Treatment on the Tensile and Punch-Shear Properties of Mg–9Li–2Al–1Zn Magnesium Alloy

“…The center of stir zone (SZ) revealed that the network-like structure (dynamic recrystallization and texture effect) 7) and the particle-like structure (frictional heat of shoulder) 8,9) were found from the thermo-mechanically affected zone (TMAZ) of advancing side to bottom of stir zone.…”

Strength and Ductility with Dual Grain-Size and Texture Gradients in AZ31 Mg Alloy

“…By virtue of the through-thickness dual gradients, the best strength-ductility combination of AZ31 sheets was obtained using SRR technique with P = 200 N, as shown in Figure 5, compared to its counterparts by various deformation processes, including homogeneous refinement and SMAT. [23,25,29,31,[35][36][37] It is noted that the SRR-treated sample with the optimal mechanical performance exhibits the dual gradients in the whole sample (about 0.9 mm) but no over hardening, compared to the case when P = 280 N.…”

Structural Effects and Charge-Discharge Characteristics of Mg-C/Mg-Li Alloy Thin Film Materials

“…Compared with the other thin films, 17) the matrix of the evaporating Mg-10Li thin film was uniform and had no voids. According to electrodes references, 18,19) the annealing would increase the uniformity of thin film, so the charge-discharge experiment of annealed Mg-10Li thin film was performed at room temperature. Figure 8 shows the curve of charge-discharge capacity for annealed Mg-10Li alloy film, which takes the first cycle as the basic value (380 mAh/g).…”