Improving the mechanical reliability of cryomilled Al–Mg alloy using a two-stage spark plasma sintering cycle

Consideration of particle rearrangement during the modeling of spark plasma densification of Al–Mg alloy powders

“…Whereas the density of the cryomilled powder sintered by SSS and TSS cycles, increased by 38.3% through the SSS cycle and by 30.9% during the first step of the TSS cycle and by 5.3% during the second step. The difference between the latter two density increases distinguishes the densification stage from the consolidation stage, as already observed by Akinrinlola et al [3]. Hence, the application of the present model highlighted this distinction compared to the previous modeling carried out by Milligan et al [8].…”

“…Compared to conventional sintering processes, the synergistic effects of current and external load result in faster densification of powder materials, as already reported [1][2][3]. However, modeling of the SPS process proved to be difficult due to the interaction of several active densification phenomena.…”

“…The average aspect ratio of the flake particles was 13. Using a Horiba LA-920 laser diffraction particle size analyzer, the atomized and cryomilled powders had, respectively, particle size distribution means of 16 lm and 21 lm with standard deviations of 7 lm and 12 lm.Subsequently, both powders were subjected to a singlestep sintering (SSS) schedule while only the cryomilled powder underwent two-step sintering (TSS) [3]. During SSS, the powders were heated up to 500°C for 30 min using a heating rate of 100°C min À1 .…”

“…Subsequently, both powders were subjected to a singlestep sintering (SSS) schedule while only the cryomilled powder underwent two-step sintering (TSS) [3]. During SSS, the powders were heated up to 500°C for 30 min using a heating rate of 100°C min À1 .…”

The Structure and Mechanical Properties of High-Strength Bulk Ultrafine-Grained Cobalt Prepared Using High-Energy Ball Milling in Combination with Spark Plasma Sintering

“…One of the other benefits of this method is the possibility of producing bulk materials with densities close to their theoretical values. Such materials exhibit significantly improved mechanical properties [24,25,26,27,28,29,30,31,32,33]. For example, studies focusing on Al-based alloys prepared by this technique reporting a compressive strength of 1200 MPa have been published [25,29].…”