Document Detail


Structure and thermomechanical behavior of NiTiPt shape memory alloy wires.
MedLine Citation:
PMID:  18718825     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The objective of this work is to understand the structure-property relationships in polycrystalline NiTiPt (Ti 42.7 at.% Ni 7.5 at %Pt) with a composition showing pseudoelasticity at ambient temperatures. Structural characterization of the alloy includes grain size determination and texture analysis while the thermomechanical properties are explored using tensile testing. Variation in heat treatment is used as a vehicle to modify microstructure. The results are compared to experiments on Ni-rich NiTi alloy wires (Ti-51.0 at.% Ni), which are in commercial use in various biomedical applications. With regards to microstructure, both alloys exhibit a <111> fiber texture along the wire drawing axis; however, the NiTiPt alloy grain size is smaller than that of the Ni-rich NiTi wires, while the latter materials contain second-phase precipitates. Given the nanometer-scale grain size in NiTiPt and the dispersed, nanometer-scale precipitate size in NiTi, the overall strength and ductility of the alloys are essentially identical when given appropriate heat treatments. Property differences include a much smaller stress hysteresis and smaller temperature dependence of the transformation stress for NiTiPt alloys compared to NiTi alloys. Potential benefits and implications for use in vascular stent applications are discussed.
Authors:
Brian Lin; Ken Gall; Hans J Maier; Robbie Waldron
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-07-30
Journal Detail:
Title:  Acta biomaterialia     Volume:  5     ISSN:  1878-7568     ISO Abbreviation:  -     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-11-26     Completed Date:  2009-03-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101233144     Medline TA:  Acta Biomater     Country:  England    
Other Details:
Languages:  eng     Pagination:  257-67     Citation Subset:  IM    
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NE, Atlanta, GA 30332, USA. blin@gatech.edu
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MeSH Terms
Descriptor/Qualifier:
Alloys / chemistry*
Biocompatible Materials / chemistry
Bone Wires
Crystallization
Elasticity
Hot Temperature
Materials Testing
Nanostructures / chemistry
Nanotechnology / methods
Nickel / chemistry*
Platinum / chemistry*
Stress, Mechanical
Temperature
Tensile Strength
Titanium / chemistry*
Chemical
Reg. No./Substance:
0/Alloys; 0/Biocompatible Materials; 7440-02-0/Nickel; 7440-06-4/Platinum; 7440-32-6/Titanium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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