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Title: Effect of heat treatment temperature on nitinol wire

In-situ synchrotron X-ray diffraction has been used to study the influence of the heat treatment temperature on the subsequent micromechanical behavior of nitinol wire. It was found that increase in the heat treatment temperature rotated the austenite texture from the (332){sub B2} fiber towards the (111){sub B2} fiber, and the texture of the Stress-Induced Martensite phase changed from the (1{sup ¯}40){sub B19'} to the (1{sup ¯}20){sub B19'} fiber accordingly. Heat treatment at a low temperature reduces the internal residual strains in the austenite during super-elastic deformation and therefore improves the materials fatigue performance. The development of internal residual strains in austenite is controlled by transformation induced plasticity and the reversal martensite to austenite transformation.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Fort Wayne Metals Research Products Corporation, 9609 Ardmore Ave., Fort Wayne, Indiana 46809 (United States)
  2. Department of Mechanical and Materials Engineering, Queen's University, Nicol Hall, 60 Union Street, Kingston, Ontario K7L 3N6 (Canada)
  3. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, 102249 Beijing (China)
  4. Argonne National Laboratory, 9700 S. Cass Ave, 433/D008, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22310874
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AUSTENITE; DEFORMATION; FIBERS; HEAT TREATMENTS; MARTENSITE; NANOWIRES; NICKEL ALLOYS; PLASTICITY; STRAINS; STRESSES; SYNCHROTRON RADIATION; TEXTURE; TITANIUM ALLOYS; TRANSFORMATIONS; X-RAY DIFFRACTION