Phase transformation behavior of porous NiTi alloys fabricated by capsule-free hot isostatic pressing

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • S. L. Wu
  • X. M. Liu
  • C. L. Chu
  • K. W K Yeung

Detail(s)

Original languageEnglish
Pages (from-to)139-143
Journal / PublicationJournal of Alloys and Compounds
Volume449
Issue number1-2
Publication statusPublished - 31 Jan 2008

Abstract

Differential scanning calorimetry (DSC) was used to characterize the phase transformation of porous NiTi alloys. Results revealed that there existed a multi-stage martensitic transformation on cooling while either a single or two-stage transformation on heating. The DSC analysis indicated that the cold compaction pressure had great effect on the transformation temperatures. The transformation temperatures of NiTi with lower compaction pressure were higher than those of NiTi compacted at higher pressure. With increase in the annealing time, the transformation temperatures quickly increased for those alloys compacted at 150 MPa. However, there was only little change in the transformation temperatures for those compacted from 300 to 400 MPa. The change in the transformation temperature can be attributed to the combined effect of high dislocations density and precipitation of the second phase. © 2006 Elsevier B.V. All rights reserved.

Research Area(s)

  • Differential scanning calorimetry, Hot isostatic pressing, Porous NiTi, Shape memory alloy

Citation Format(s)