Details
| Original language | English |
|---|---|
| Article number | 111130 |
| Journal | Materials Science and Engineering C |
| Volume | 115 |
| Early online date | 28 May 2020 |
| Publication status | Published - Oct 2020 |
Abstract
In this work, a bioresorbable Mg-ZKQX6000 (Mg–6Zn–0.6Zr–0.4Ag–0.2Ca (wt%)) alloy was severely plastically deformed via equal channel angular pressing (ECAP) according to three unique hybrid routes at low temperatures (200 °C to 125 °C). The roles of ECAP processing on microstructure, and ensuing mechanical properties and corrosion rates, are assessed. Microstructurally, ECAP induces a complex plethora of features, especially variations in grain sizes and precipitates' sizes, distributions, and morphologies for individual cases. Mechanically, ECAP generally refined grain size, resulting in ultra-high strength levels of about 400 MPa in ultimate tensile strength for several cases; however, deformation via ECAP of precipitates induced embrittlement and low elongation to failure levels. Corrosion testing, conducted in simulated bodily fluid at bodily pH levels to mimic conditions in the human body, revealed consistent corrosion rates across several techniques (mass loss, hydrogen evolution, and electrochemical impedance spectroscopy (EIS)), showing that severe plastic deformation deteriorates corrosion resistance for this material. In-situ corrosion monitoring explained that corrosion accelerated after ECAP due to the creation of heterogeneous, anodic shear zones, which exhibited dense regions of refined grains and fine precipitates. Suggestions for future design and thermomechanical processing of Mg alloys for bioresorbable orthopedic implants are provided.
Keywords
- Anodic dissolution, Bioresorbable orthopedic implants, Corrosion, Equal channel angular pressing, Magnesium, Severe plastic deformation
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Materials Science and Engineering C, Vol. 115, 111130, 10.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The effects of severe plastic deformation on the mechanical and corrosion characteristics of a bioresorbable Mg-ZKQX6000 alloy
AU - Vaughan, M. W.
AU - Karayan, A. I.
AU - Srivastava, A.
AU - Mansoor, B.
AU - Seitz, J. M.
AU - Eifler, R.
AU - Karaman, I.
AU - Castaneda, H.
AU - Maier, H. J.
N1 - Funding information: This publication was made possible by a National Priorities Research Program grant, NPRP 8-856-2-364 from the Qatar National Research Fund (a member of The Qatar Foundation). The statements made herein are solely the responsibility of the authors. MWV and IK acknowledge the financial support from the U.S. National Science Foundation under Grant Number CMMI-1563580 (Program Director: Dr. Alexis Lewis). HJM, JMS, and RE acknowledges the financial support from Deutsche Forschungsgemeinschaft (grant No. MA 1175/52-1). The technical assistance of Mr. Robert Barber, Mr. Michael Elverud, Dr. Christian Klose, and Dr. Marcus Engelhardt is much appreciated. This publication was made possible by a National Priorities Research Program grant, NPRP 8-856-2-364 from the Qatar National Research Fund (a member of The Qatar Foundation). The statements made herein are solely the responsibility of the authors. MWV and IK acknowledge the financial support from the U.S. National Science Foundation under Grant Number CMMI-1563580 (Program Director: Dr. Alexis Lewis). HJM, JMS, and RE acknowledges the financial support from Deutsche Forschungsgemeinschaft (grant No. MA 1175/52-1 ). The technical assistance of Mr. Robert Barber, Mr. Michael Elverud, Dr. Christian Klose, and Dr. Marcus Engelhardt is much appreciated.
PY - 2020/10
Y1 - 2020/10
N2 - In this work, a bioresorbable Mg-ZKQX6000 (Mg–6Zn–0.6Zr–0.4Ag–0.2Ca (wt%)) alloy was severely plastically deformed via equal channel angular pressing (ECAP) according to three unique hybrid routes at low temperatures (200 °C to 125 °C). The roles of ECAP processing on microstructure, and ensuing mechanical properties and corrosion rates, are assessed. Microstructurally, ECAP induces a complex plethora of features, especially variations in grain sizes and precipitates' sizes, distributions, and morphologies for individual cases. Mechanically, ECAP generally refined grain size, resulting in ultra-high strength levels of about 400 MPa in ultimate tensile strength for several cases; however, deformation via ECAP of precipitates induced embrittlement and low elongation to failure levels. Corrosion testing, conducted in simulated bodily fluid at bodily pH levels to mimic conditions in the human body, revealed consistent corrosion rates across several techniques (mass loss, hydrogen evolution, and electrochemical impedance spectroscopy (EIS)), showing that severe plastic deformation deteriorates corrosion resistance for this material. In-situ corrosion monitoring explained that corrosion accelerated after ECAP due to the creation of heterogeneous, anodic shear zones, which exhibited dense regions of refined grains and fine precipitates. Suggestions for future design and thermomechanical processing of Mg alloys for bioresorbable orthopedic implants are provided.
AB - In this work, a bioresorbable Mg-ZKQX6000 (Mg–6Zn–0.6Zr–0.4Ag–0.2Ca (wt%)) alloy was severely plastically deformed via equal channel angular pressing (ECAP) according to three unique hybrid routes at low temperatures (200 °C to 125 °C). The roles of ECAP processing on microstructure, and ensuing mechanical properties and corrosion rates, are assessed. Microstructurally, ECAP induces a complex plethora of features, especially variations in grain sizes and precipitates' sizes, distributions, and morphologies for individual cases. Mechanically, ECAP generally refined grain size, resulting in ultra-high strength levels of about 400 MPa in ultimate tensile strength for several cases; however, deformation via ECAP of precipitates induced embrittlement and low elongation to failure levels. Corrosion testing, conducted in simulated bodily fluid at bodily pH levels to mimic conditions in the human body, revealed consistent corrosion rates across several techniques (mass loss, hydrogen evolution, and electrochemical impedance spectroscopy (EIS)), showing that severe plastic deformation deteriorates corrosion resistance for this material. In-situ corrosion monitoring explained that corrosion accelerated after ECAP due to the creation of heterogeneous, anodic shear zones, which exhibited dense regions of refined grains and fine precipitates. Suggestions for future design and thermomechanical processing of Mg alloys for bioresorbable orthopedic implants are provided.
KW - Anodic dissolution
KW - Bioresorbable orthopedic implants
KW - Corrosion
KW - Equal channel angular pressing
KW - Magnesium
KW - Severe plastic deformation
UR - http://www.scopus.com/inward/record.url?scp=85086078219&partnerID=8YFLogxK
U2 - 10.1016/j.msec.2020.111130
DO - 10.1016/j.msec.2020.111130
M3 - Article
AN - SCOPUS:85086078219
VL - 115
JO - Materials Science and Engineering C
JF - Materials Science and Engineering C
SN - 0928-4931
M1 - 111130
ER -