Effect of Niobium Content on Shape Memory Characteristics of (Ni47Ti44)100-xNbx Alloys

Journal Article · Mon Jun 28 04:00:00 EDT 2004 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1774547· OSTI ID:20653211

He, X M; Yan, D S; Rong, L J; Li, Y Y ^[1]

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1. Institute of Metal Research, Chinese Academy of Science, Shenyang, 110016 (China)

The effect of niobium content on shape memory characteristics in (Ni47Ti44)100-xNbx (at.%) alloys (x=3,9,15,20,30) was investigated in detail by performing differential scanning calorimetry and cryogenic tensile tests at a temperature of (Ms+30 K). The results show that tensile strain as much as 6% vanished completely in five alloys after unloading and then heating to 473K. But with increasing the deformation, substantial plastic deformation that was irreversible occurred in the niobium-rich phase. As a result, the residual elongation increased. Moreover, the degradation of the shape recovery ratio increased with increasing niobium content. It was also found that the transformation hysteresis was widened by deformation. The effect of niobium content on the transformation hysteresis and shape memory effect was investigated systematically and the related mechanism has been proposed based on microstructural analysis. In view of the engineering application, where wide hysteresis and better shape memory effect is desired, the optimized niobium content is proposed.

• OSTI ID: 20653211
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 711; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALORIMETRY
ELONGATION
ENGINEERING
HEATING
HYSTERESIS
NICKEL ALLOYS
NIOBIUM ALLOYS
PHASE TRANSFORMATIONS
SHAPE MEMORY EFFECT
STRAINS
TEMPERATURE RANGE 0400-1000 K
TESTING
TITANIUM ALLOYS
UNLOADING