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Title: Mechanical and degradation property improvement in a biocompatible Mg-Ca-Sr alloy by thermomechanical processing

Magnesium-based alloys have attracted interest as a potential material to comprise biomedical implants that are simultaneously high-strength and temporary, able to provide stabilization before degrading safely and able to be excreted by the human body. Many alloy systems have been evaluated, but this work reports on improved properties through hot extrusion of one promising alloy: Mg-1.0 wt% Ca-0.5 wt%Sr. This alloy has previously demonstrated promising toxicity and degradation properties in the as-cast and rolled conditions. In the current study extrusion causes a dramatic improvement in the mechanical properties in tension and compression, as well as a low in vitro degradation rate. Microstructure (texture, second phase distribution, and grain size), bulk mechanical properties, flow behavior, degradation in simulated body fluid, and effect on osteoblast cyctotoxicity are evaluated and correlated to extrusion temperature. In conclusion, maximum yield strength of 300 MPa (above that of annealed 316 stainless steel) with 10% elongation is observed, making this alloy competitive with existing implant materials.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ; ORCiD logo [1] ;  [2] ;  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of the Mechanical Behavior of Biomedical Materials
Additional Journal Information:
Journal Volume: 80; Journal Issue: C; Journal ID: ISSN 1751-6161
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Magnesium; Strontium; Biodegradable; Reabsorbable; Extrusion; Implant
OSTI Identifier:
1439947

Henderson, Hunter B., Ramaswamy, Vidhya, Wilson-Heid, Alexander E., Kesler, Michael S., Allen, Josephine B., and Manuel, Michele Viola. Mechanical and degradation property improvement in a biocompatible Mg-Ca-Sr alloy by thermomechanical processing. United States: N. p., Web. doi:10.1016/j.jmbbm.2018.02.001.
Henderson, Hunter B., Ramaswamy, Vidhya, Wilson-Heid, Alexander E., Kesler, Michael S., Allen, Josephine B., & Manuel, Michele Viola. Mechanical and degradation property improvement in a biocompatible Mg-Ca-Sr alloy by thermomechanical processing. United States. doi:10.1016/j.jmbbm.2018.02.001.
Henderson, Hunter B., Ramaswamy, Vidhya, Wilson-Heid, Alexander E., Kesler, Michael S., Allen, Josephine B., and Manuel, Michele Viola. 2018. "Mechanical and degradation property improvement in a biocompatible Mg-Ca-Sr alloy by thermomechanical processing". United States. doi:10.1016/j.jmbbm.2018.02.001. https://www.osti.gov/servlets/purl/1439947.
@article{osti_1439947,
title = {Mechanical and degradation property improvement in a biocompatible Mg-Ca-Sr alloy by thermomechanical processing},
author = {Henderson, Hunter B. and Ramaswamy, Vidhya and Wilson-Heid, Alexander E. and Kesler, Michael S. and Allen, Josephine B. and Manuel, Michele Viola},
abstractNote = {Magnesium-based alloys have attracted interest as a potential material to comprise biomedical implants that are simultaneously high-strength and temporary, able to provide stabilization before degrading safely and able to be excreted by the human body. Many alloy systems have been evaluated, but this work reports on improved properties through hot extrusion of one promising alloy: Mg-1.0 wt% Ca-0.5 wt%Sr. This alloy has previously demonstrated promising toxicity and degradation properties in the as-cast and rolled conditions. In the current study extrusion causes a dramatic improvement in the mechanical properties in tension and compression, as well as a low in vitro degradation rate. Microstructure (texture, second phase distribution, and grain size), bulk mechanical properties, flow behavior, degradation in simulated body fluid, and effect on osteoblast cyctotoxicity are evaluated and correlated to extrusion temperature. In conclusion, maximum yield strength of 300 MPa (above that of annealed 316 stainless steel) with 10% elongation is observed, making this alloy competitive with existing implant materials.},
doi = {10.1016/j.jmbbm.2018.02.001},
journal = {Journal of the Mechanical Behavior of Biomedical Materials},
number = C,
volume = 80,
place = {United States},
year = {2018},
month = {2}
}