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Shape-memory properties in Ni-Ti sputter-deposited film
- Source :
- Journal of Applied Physics. 68
- Publication Year :
- 1990
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1990.
-
Abstract
- A Ni-Ti alloy, generically called nitinol, was prepared from sputtering targets of two different compositions on glass substrates using a dc magnetron source. The as-deposited films were amorphous in structure and did not exhibit a shape memory. The amorphous films were crystallized with a suitable annealing process, and the transformation properties were measured using differential scanning calorimetry. The annealed films demonstrated a strong shape-memory effect. Stress/strain measurements and physical manipulation were used to evaluate the shape recovery. These tests demonstrated sustained tensile stresses of up to 480 MPa in the high-temperature phase, and a characteristic plastic deformation in the low-temperature phase.
- Subjects :
- Metallic Materials
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 68
- Database :
- NASA Technical Reports
- Journal :
- Journal of Applied Physics
- Notes :
- NAS2-12797
- Publication Type :
- Report
- Accession number :
- edsnas.19910036036
- Document Type :
- Report
- Full Text :
- https://doi.org/10.1063/1.346914