Shape Memory Behavior of [111]-Oriented NiTi Single Crystals After Stress-Assisted Aging
ACTA METALLURGICA SINICA-ENGLISH LETTERS, vol.29, no.3, pp.282-286, 2016 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 29 Issue: 3
- Publication Date: 2016
- Doi Number: 10.1007/s40195-016-0386-1
- Journal Name: ACTA METALLURGICA SINICA-ENGLISH LETTERS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.282-286
- Keywords: Shape memory alloy (SMA), Two-way shape memory effect, Aging treatment, Precipitation, Phase transformations, ZN-AL ALLOYS, MARTENSITIC-TRANSFORMATION, TINI, PHASE, TEMPERATURE
- Open Archive Collection: AVESIS Open Access Collection
- Anadolu University Affiliated: Yes
Abstract
The shape memory behavior of [111]-oriented Ni51Ti49 (at.%) single crystals was investigated after stress assisted aging at 500 degrees C for 1.5 h under a compressive stress of -150 MPa. It was found that a single family of Ni4Ti3 precipitates with two crystallographically equivalent variants was formed after aging under compressive stress. Stress-assisted aging resulted in tensile two-way shape memory effect strain of 1.56% under -5 MPa. Thermal cycling under -600 MPa resulted in a transformation strain of -2.15%, while the subsequent thermal cycling under -5 MPa resulted in a tensile two-way shape memory effect strain of 2.2%.