A Novel High-Strength Zn-3Ag-0.5Mg Alloy Processed by Hot Extrusion, Cold Rolling, or High-Pressure Torsion
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A Novel High-Strength Zn-3Ag-0.5Mg Alloy Processed by Hot Extrusion, Cold Rolling, or High-Pressure Torsion MARIA WA˛TROBA, WIKTOR BEDNARCZYK, JAKUB KAWAŁKO, SEBASTIAN LECH, KRZYSZTOF WIECZERZAK, TERENCE G. LANGDON, and PIOTR BAŁA A novel Zn-3Ag-0.5Mg alloy was plastically deformed using 3 processing paths: hot extrusion (HE), HE followed by cold rolling (CR) and high-pressure torsion (HPT). The processed samples consisted of the g-Zn phase, e-Zn3Ag precipitates within the matrix, and nanometric Zn2Mg precipitates within the Zn11Mg2 phase located at the grain boundaries. Both the g-Zn phase and Mg-rich phases were enriched in Ag. Electron backscattered diffraction was used to examine the effects of grain size and texture on mechanical behavior with tensile tests performed at room temperature (RT) at different strain rates. The coarse-grained (~ 6 lm) samples after HE exhibited high strength with brittleness due to dislocation interaction with dispersed precipitates and, to some extent, with twinning activation. Significant grain refinement and processing at RT gave an increase in elongation to over 50 pct in CR and 120 pct in HPT. Ductile CR samples with an average grain size of ~ 2 lm and favorable rolling deformation texture gave a yield strength of ~ 254 MPa, a tensile strength of ~ 456 MPa, and a reasonable strain rate sensitivity. These values for the CR samples meet the mechanical requirements for biodegradable stents in cardiovascular applications. https://doi.org/10.1007/s11661-020-05797-y The Author(s) 2020
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MARIA WA˛TROBA and WIKTOR BEDNARCZYK are with the Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Krakow, Poland. Contact e-mail: [email protected] JAKUB KAWAŁKO is with the Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Krakow, Poland. SEBASTIAN LECH is with the Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology and also with the International Centre of Electron Microscopy for Materials Science, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Krakow, Poland. KRZYSZTOF WIECZERZAK is with the Laboratory for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Science and Technology, Feuerwerkerstrasse 39, 3602 Thun, Switzerland. TERENCE G. LANGDON is with the Department of Mechanical Engineering, Materials Research Group, University of Southampton, Southampton SO17 1BJ, UK. PIOTR BAŁA is with the Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology and also with the Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology. Manuscript submitted January 13, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS A
INTRODUCTION
CONTINUOUS medical development and objectives for improving the quality of human lives have created high demands in the field of m
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