Effects of deformation temperature and amount on the two-way shape memory effect of solutionized Ni50.8Ti49.2 alloys

Kaya I., Acar E., Karaca H. E.

INTERMETALLICS, vol.114, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 114
  • Publication Date: 2019
  • Doi Number: 10.1016/j.intermet.2019.106607
  • Journal Name: INTERMETALLICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Shape-memory alloys, Two-way shape memory effect, Phase transformation, Mechanical testing, NiTi, R-phase, TI-NI, TRANSFORMATION
  • Erciyes University Affiliated: Yes

Abstract

Temperature dependent compressive response and two-way shape memory effect (TWSME) of Ni50.8Ti49.2 (at.%) shape memory alloys were systematically investigated. It was found that solutionized Ni50.8Ti49.2 alloys could show positive and negative TWSME if they are plastically deformed in martensite and austenite (above Md), respectively. The maximum positive TWSME strain was 1.4% after martensite deformation of 8% at -90 degrees C and maximum negative TWSME strain of 0.5% was obtained after austenite deformation of 8% at 200 degrees C.