The University of Southampton
University of Southampton Institutional Repository
Warning ePrints Soton is experiencing an issue with some file downloads not being available. We are working hard to fix this. Please bear with us.

A novel high-strength Zn-3Ag-0.5Mg alloy processed by hot extrusion, cold rolling or high-pressure torsion

A novel high-strength Zn-3Ag-0.5Mg alloy processed by hot extrusion, cold rolling or high-pressure torsion
A novel high-strength Zn-3Ag-0.5Mg alloy processed by hot extrusion, cold rolling or high-pressure torsion
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 η-Zn phase, ε-Zn3Ag precipitates within the matrix, and nanometric Zn2Mg precipitates within the Zn11Mg2 phase located at the grain boundaries. Both the η-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 coarsegrained (~6 μm) 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% in CR and 120% in HPT. Ductile CR samples with an average grain size of ~2μm 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.
biodegradation, grain refinement, mechanical properties, ultrafine grains, zinc alloy
1073-5623
3335-3348
Watroba, Maria
0907548f-be5b-4611-acbb-f0a8830d79b4
Bednarczyk, Wiktor
fcff0fa3-5e50-4667-a096-1d5c1b1b8bab
Kawalko, Jakub
9d532997-478b-4ed4-90e8-646fba17f591
Lech, Sebastian
e7142cc0-5192-4f45-9032-9cba4636325a
Wieczerzak, Krysztof
59561e48-15d7-43e9-890d-d843b00f4a51
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Bala, Piotr
b2f6d414-52ac-4555-b104-400cf9603f4b
Watroba, Maria
0907548f-be5b-4611-acbb-f0a8830d79b4
Bednarczyk, Wiktor
fcff0fa3-5e50-4667-a096-1d5c1b1b8bab
Kawalko, Jakub
9d532997-478b-4ed4-90e8-646fba17f591
Lech, Sebastian
e7142cc0-5192-4f45-9032-9cba4636325a
Wieczerzak, Krysztof
59561e48-15d7-43e9-890d-d843b00f4a51
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Bala, Piotr
b2f6d414-52ac-4555-b104-400cf9603f4b

Watroba, Maria, Bednarczyk, Wiktor, Kawalko, Jakub, Lech, Sebastian, Wieczerzak, Krysztof, Langdon, Terence G and Bala, Piotr (2020) A novel high-strength Zn-3Ag-0.5Mg alloy processed by hot extrusion, cold rolling or high-pressure torsion. Metallurgical and Materials Transactions A, 51 (7), 3335-3348. (doi:10.1007/s11661-020-05797-y).

Record type: Article

Abstract

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 η-Zn phase, ε-Zn3Ag precipitates within the matrix, and nanometric Zn2Mg precipitates within the Zn11Mg2 phase located at the grain boundaries. Both the η-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 coarsegrained (~6 μm) 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% in CR and 120% in HPT. Ductile CR samples with an average grain size of ~2μm 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.

Text
Watroba-MMTA-accepted - Accepted Manuscript
Download (2MB)

More information

Accepted/In Press date: 11 April 2020
e-pub ahead of print date: 9 May 2020
Keywords: biodegradation, grain refinement, mechanical properties, ultrafine grains, zinc alloy

Identifiers

Local EPrints ID: 439624
URI: http://eprints.soton.ac.uk/id/eprint/439624
ISSN: 1073-5623
PURE UUID: 2e575203-2780-4a75-b0ce-2d2262d4cc5d
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 28 Apr 2020 16:35
Last modified: 26 Nov 2021 06:33

Export record

Altmetrics

Contributors

Author: Maria Watroba
Author: Wiktor Bednarczyk
Author: Jakub Kawalko
Author: Sebastian Lech
Author: Krysztof Wieczerzak
Author: Piotr Bala

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×