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Title: Machining-induced surface transformations of magnesium alloys to enhance corrosion resistance in human-like environment

We report that magnesium alloys are becoming increasingly attractive for producing temporary prosthetic devices thanks to their bioresorbable characteristics in human body. However, their poor corrosion resistance to body fluids seriously limits their applicability. In this work, machining-induced surface transformations are explored as means to enhance corrosion resistance of AZ31 magnesium alloy. Surface characteristics including topography, residual stresses, wettability, microstructures and depth of transformed layer, were analysed and correlated to in-vitro corrosion resistance. Results showed that cryogenic machining at low feed provided the most promising corrosion reduction. Finally, thorough physical characterizations gave fundamental insights into possible drivers for this enhanced resistance.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [2] ; ORCiD logo [3]
  1. University of Padova (Italy). Department of Industrial Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  3. The Ohio State Univ., Columbus, OH (United States). Department of Integrated Systems Engineering
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
CIRP Annals
Additional Journal Information:
Journal Name: CIRP Annals; Journal ID: ISSN 0007-8506
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; 42 ENGINEERING; Magnesium; Cryogenic machining; Surface integrity
OSTI Identifier:
1435176

Bruschi, Stefania, Bertolini, Rachele, Ghiotti, Andrea, Savio, Enrico, Guo, Wei, and Shivpuri, Rajiv. Machining-induced surface transformations of magnesium alloys to enhance corrosion resistance in human-like environment. United States: N. p., Web. doi:10.1016/j.cirp.2018.04.040.
Bruschi, Stefania, Bertolini, Rachele, Ghiotti, Andrea, Savio, Enrico, Guo, Wei, & Shivpuri, Rajiv. Machining-induced surface transformations of magnesium alloys to enhance corrosion resistance in human-like environment. United States. doi:10.1016/j.cirp.2018.04.040.
Bruschi, Stefania, Bertolini, Rachele, Ghiotti, Andrea, Savio, Enrico, Guo, Wei, and Shivpuri, Rajiv. 2018. "Machining-induced surface transformations of magnesium alloys to enhance corrosion resistance in human-like environment". United States. doi:10.1016/j.cirp.2018.04.040.
@article{osti_1435176,
title = {Machining-induced surface transformations of magnesium alloys to enhance corrosion resistance in human-like environment},
author = {Bruschi, Stefania and Bertolini, Rachele and Ghiotti, Andrea and Savio, Enrico and Guo, Wei and Shivpuri, Rajiv},
abstractNote = {We report that magnesium alloys are becoming increasingly attractive for producing temporary prosthetic devices thanks to their bioresorbable characteristics in human body. However, their poor corrosion resistance to body fluids seriously limits their applicability. In this work, machining-induced surface transformations are explored as means to enhance corrosion resistance of AZ31 magnesium alloy. Surface characteristics including topography, residual stresses, wettability, microstructures and depth of transformed layer, were analysed and correlated to in-vitro corrosion resistance. Results showed that cryogenic machining at low feed provided the most promising corrosion reduction. Finally, thorough physical characterizations gave fundamental insights into possible drivers for this enhanced resistance.},
doi = {10.1016/j.cirp.2018.04.040},
journal = {CIRP Annals},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {4}
}