Influence of work hardening caused by martensitic transformation on the shape memory effect in Fe-Ni-Nb alloys
The work hardening caused by martensitic transformation (WHM) is known to result in an increase in the shape recovery degree. In Fe-Ni-Nb alloys, the hard particles of Ni/sub 3/Nb and Fe/sub 2/Nb-type effectively prevent dislocation movement and partially constrict transformation hysteresis as well as increasing the shape recovery degree. It should be expected that WHM has a significant influence on both the martensitic transformation characteristics and shape memory effect in these alloys. The alloys under study were cast in a vacuum induction furnace by using materials: Ni - 99.8%, Fe - 99.0%, Nb - 99.2%. The alloys were hot rolled into rods of 5 mm in diameter, then homogenized at 1150{sup 0}C for 75 h. The critical temperatures of martensitic transformation, and quantitative characteristics of the shape memory effect, were determined by a threepoint deflection scheme using 3 X 0.3 X 30 mm samples, as described in detail. The microstructure was investigated by optical microscopy. X-ray analysis was carried out by using a difractometer at room temperature.
- OSTI ID:
- 5306206
- Journal Information:
- Scripta Metallurgica; (USA), Vol. 23:10; ISSN 0036-9748
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microstructure, phase stability, mechanical properties, and shape memory characteristics of Ni-Fe-Al-B alloys
Microstructure, phase stability, mechanical properties, and shape memory characteristics of Ni-Fe-Al-B alloys
Related Subjects
IRON ALLOYS
MICROSTRUCTURE
MARTENSITE
PHASE TRANSFORMATIONS
NICKEL ALLOYS
NIOBIUM ALLOYS
CHEMICAL COMPOSITION
DEFORMATION
EXPERIMENTAL DATA
TENSILE PROPERTIES
X-RAY DIFFRACTION
ALLOYS
CARBON ADDITIONS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
INFORMATION
MECHANICAL PROPERTIES
NUMERICAL DATA
SCATTERING
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties