The effect of porosity on phase transformation behavior of porous Ti-50.8 at.% Ni shape memory alloys prepared by capsule-free hot isostatic pressing

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

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)585-588
Journal / PublicationMaterials Science and Engineering A
Volume438-440
Issue numberSPEC. ISS.
Publication statusPublished - 25 Nov 2006

Abstract

The porous Ti-50.8 at.% Ni shape memory alloys (SMAs) were successfully fabricated by capsule-free hot isostatic pressing (CF-HIP) method. The phase transformation behaviors of the fabricated porous NiTi SMAs with various porosity ratios were investigated. It was seen that the porous alloys show a uniform pore distribution with the spherical pore size ranging mainly from 50 to 200 μm. And their phase transformation behaviors are similar to that of conventional cast dense Ni-rich TiNi alloys. It has also been seen that phase transformation during cooling process occurs by two steps, that is, R-phase transformation and B19′ martensitic transformation, respectively. In addition, it was also found that the pores have a significant influence on B19′ martensitic transformation, while little influence on R-phase transformation. The characteristic transformation temperatures and latent heats of B19′ martensitic transformation in porous Ti-50.8 at.% Ni SMAs were found to decrease with increasing porosity ratio. © 2006 Elsevier B.V. All rights reserved.

Research Area(s)

  • Capsule-free hot isostatic pressing, Phase transformation, Porosity ratio, Porous TiNi, Shape memory alloys

Citation Format(s)

The effect of porosity on phase transformation behavior of porous Ti-50.8 at.% Ni shape memory alloys prepared by capsule-free hot isostatic pressing. / Yuan, B.; Zhang, X. P.; Chung, C. Y.; Zhu, M.

In: Materials Science and Engineering A, Vol. 438-440, No. SPEC. ISS., 25.11.2006, p. 585-588.

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