Transformation of Lamellar Structures in Equal Channel Angular Pressing: Geometric Model and Application to Nickel Aluminum Bronze
CJ Barr, DT McDonald, K Xia
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Springer Boston | Published : 2015
Nickel aluminum bronze (NAB) with a duplex structure was subjected to equal channel angular pressing (ECAP). Samples were pressed for up to four passes at 673 K (400 °C) using routes A, BA, BC, and C, respectively, and the evolution of the microstructures was characterized. A detailed geometric model was developed to enable systematic and quantitative analysis of the transformation of the lamellar structure during ECAP. Depending on their orientations before each ECAP pass, the lamellae were either stretched, leading to fragmentation, or compressed, resulting in buckling and spheroidisation at locations of high curvature. Thanks to the continuous rotation of lamellae into the stretching orie..View full abstract
The authors would like to acknowledge the support of the Defence Materials Technology Centre (DMTC). The DMTC was established and is supported under the Australian Government's Defence Future Capability Technology Centres Programme.