Effect of thermal cycling on the R-phase and martensitic transformations in a Ti-rich NiTi alloy

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0244-5· OSTI ID:616493

Pelosin, V; Riviere, A ^[1]

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1. ENSMA/LMPM, Futuroscope (France). Lab. of Mechanic and Physic of Materials

The effect of thermal cycling on transformation temperature was studied on a Ti-rich NiTi alloy. The study was carried out by determining the electrical resistance, the internal friction, and the elastic modulus vs temperature. This study shows that the martensite microstructure is modified by the successive cycling transformation. In addition, the authors established that both the martensite internal friction and the transition peak are sensitive to the transient effect (the vibration frequency lies around 300 Hz). But the major results concern the behavior associated with the R phase occurrence and its evolution. They have stated that the premartensitic phase becomes stable following the diminishment of the beginning of the martensite formation (M{sub s}). Interrupted cooling has also shown that, contrary to the martensite, the R phase exhibits no hysteretic behavior.

• Sponsoring Organization: USDOE
• OSTI ID: 616493
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 4 Vol. 29; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL-PHASE TRANSFORMATIONS
MICROSTRUCTURE
NICKEL ALLOYS
THERMAL CYCLING
TITANIUM BASE ALLOYS
TRANSITION TEMPERATURE