|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||The unusual effect of HPT processing on microstructure and mechanical properties in Zn-alloys
||Wiktor Bednarczyk, Maria Wątroba, Jakub Kawałko, Piotr Bała, Terence G. Langdon
|On-Site Speaker (Planned)
High pressure torsion (HPT) processing in most cases produces an ultrafine-grained microstructure characterized by high angle grain boundaries and texture resulting from the characteristic deformation mechanism for the particular alloy group. Deviations from expected texture are rarely observed in single phase alloys.
In this work pure zinc and low-alloyed Zn-Ag and Zn-Cu alloys were processed by HPT for 1/2 – 10 turns. Based on microstructural investigations three different deformation behaviors were identified. Pure Zn presents grain refinement up to 2 turns, and on further deformation grain growth was observed with crystallographic texture consistent with activation of 2nd order pyramidal slip system. After 5 turns the Zn-Cu alloy presents typical basal fiber texture with misorientation angle of all grain boundaries < 30°, while the Zn-Ag alloy presents previously not observed abnormal grain growth with 0001 direction parallel to the tangential direction and 11-20 direction perpendicular to the shearing plane.
||Characterization, Biomaterials, Mechanical Properties