The effects of SiC particle volume fraction on the microstructure and hot workability of SiCp/AA 2024 composites

Optimization of the Machinability of the Al-SiC Metal Matrix Composite Using the Dynamic Material Model

“…The preceding behavior was also experienced by Ko et al [25] It is interesting to note that at all the investigated strain rates, the shear stress decreases and then it increases with respect to the temperatures, i.e., exhibiting a minimum in the intermediate temperature range (typical plots of shear stress vs temperature at different cutting speeds are given in Figure 2). The minimum was observed to be within 125°C to 275°C.…”

“…It has been experimentally demonstrated that heating the workpiece can extend the tool life and also improve the roughness of the machined surfaces. [5][6][7][8][9] Vedani and Garibold [10] reported that at temperatures above 300°C, Al-SiC composites exhibit significantly reduced flow stress. Although the preceding studies have not necessarily been performed under optimal conditions, significant improvement of machinability has been reported.…”

3D FE analysis on the product defects of composites formed by liquid–solid extrusion process

“…The hot recovery mechanism of the composites was DRX, and the addition of reinforcement promoted nucleation of the DRX. Moreover, it was found the value of the critical strain for the onset of DRX decreased with increasing deformation temperature (Ko et al, 1999). Therefore it can be concluded that the DRX of the matrix in the composite was more prominent than that of the unreinforced monolithic alloy during high temperature deformation in this process.…”

“…Based on the detailed studies of the flow stress and deformed microstructures of metal matrix composites in thermoplastic deformation (Ko et al, 1999;Malas et al, 2004;Yoo et al, 1997), it was found that the addition of whiskers or particles in composites results in a high flow stress and a low critical strain for the onset of DRX (dynamic recrystallization) of the composites. The hot recovery mechanism of the composites was DRX, and the addition of reinforcement promoted nucleation of the DRX.…”

Deformation behavior of AA2017–SiCp in warm and hot deformation regions

“…Rajamuthamilselvan and Ramanathan [18] studied hot working of AA7075-15% SiCp using compression tests in temperatures and strain rates of 300-500°C and 0.001-1.0 s À1 , respectively. Ko et al [19] investigated hot workability of AA2024 reinforced with different amount of SiC particles. To do so, hot torsion tests at a constant strain rate of 1.0 s À1 and temperatures between 320 and 500°C were carried out in which the occurrences of dynamic recrystallization and recovery as well as the effects of volume fraction of SiC particles on the failure strain were determined.…”