Research on the improvement of shape-memory and magnetostrictive materials. Report for 1 August 1989-31 July 1993
The goals of this research are to give predictive, quantitative models that can be used to improve shape-memory and magnetostrictive materials, and that can guide the development of new materials. A new theory of martensite and a new theory of magnetostriction were found, both of which predict accurately observed domain structures in these alloys. The principal findings based on these theories are (1) the importance of the precise values of the lattice parameters in determining the microstructure, and therefore the behavior of these materials; (2) the presence of the growth twins in Tb(x)Dy(1-x)Fe2, the material with the largest known magnetostriction, do not decrease the magnetostrictive strain in this alloy, as was formerly thought; (3) thermoelastic theory gives a mechanism for increased strain-rate dependence in uniaxial tension experiments on TiNi. A unique experimental facility was built for fundamental experimental studies on stress and magnetic field-induced phase transformation.
- Research Organization:
- Minnesota Univ., Minneapolis, MN (United States). Office of Research and Technology Transfer Administration
- OSTI ID:
- 5152702
- Report Number(s):
- AD-A-275397/8/XAB; CNN: DAAL03-89-G-0081
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CARBON ADDITIONS
ELASTICITY
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETOSTRICTION
MARTENSITE
MECHANICAL PROPERTIES
MICROSTRUCTURE
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SHAPE MEMORY EFFECT
TENSILE PROPERTIES
THERMOELASTICITY