|About this Abstract
||MS&T23: Materials Science & Technology
||Metal Powder Synthesis and Processing: Fundamental Aspects and Modeling
||Microstructural Characterization of Zn-3Mg(wt.%) Processed by High-pressure Torsion
||Tanzilur Rahman, Connor Wasick, Hakan Yilmazer, Megumi Kawasaki, Burak Dikici, Kaveh Edalati, Carl J. Boehlert
|On-Site Speaker (Planned)
High-pressure torsion (HPT) is a solid-state metalworking process used to achieve equiaxed ultrafine grains, which tend to promote higher strength and hardness. In this work, HPT was carried out on a cast-then-homogenized Zn-3Mg(wt%) alloy and pure Zn and Mg powders in a mass ratio of Zn-3Mg, under 6 GPa pressure for different numbers of turns at room temperature. The Vickers microhardness distribution, with respect to equivalent strain, varied for the alloy and powder-processed HPT disks, though it reached a saturation level in both cases. The microstructure in different regions of the HPT disks was characterized using XRD, SEM, EBSD, APT, and TEM. The grain size, phase morphology, and the formation of different intermetallics were analyzed and used to explain the hardness distribution. The grain size of the pure Zn phase refined from about 3 microns at the initial strain to nano-sizes at the higher strains in both HPT-processed materials.