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Austenite-Martensite Phase Transformation of Biomedical Ni50.8Ti49.2 Alloy by Ball Burnishing

[+] Author Affiliations
C. H. Fu, Y. B. Guo

The University of Alabama, Tuscaloosa, AL

X. T. Wei

Shandong University of Technology, Zibo, Shandong, China

Paper No. MSEC2013-1241, pp. V001T01A016; 9 pages
doi:10.1115/MSEC2013-1241
From:
  • ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference
  • Volume 1: Processing
  • Madison, Wisconsin, USA, June 10–14, 2013
  • Conference Sponsors: Manufacturing Engineering Division
  • ISBN: 978-0-7918-5545-4
  • Copyright © 2013 by ASME

abstract

Nitinol alloys have received considerable attentions in biomedical and aerospace applications. They can exhibit both austenite and martensite phases at room temperature. Austenite can transform to martensite by applied stress or temperature. Ball burnishing is a very promising technique to modify surface integrity via plastic deformation on the workpiece surface. Phase transformation of Nitinol by burnishing may occur at certain load, which results in the mechanical property change on the workpiece. A burnishing experiment has been conducted in this research at different burnishing loads. The burnishing tracks are characterized and microstructures in the subsurface are studied. A corresponding simulation is also performed to shed light on phase transformation mechanism of Nitinol in burnishing.

Copyright © 2013 by ASME

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