Spark plasma sintering of TiNi nanopowders

Dan Nicolau, Yong Qing Fu, Shabbir Moochhala, Christopher Shearwood, Uwe Muller, John M. Dell

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Nano-size TiNi powder prepared by electro explosion of TiNi wire process as processed by spark plasma sintering for 5 minutes at variable temperatures between 700 and 1000°C. The shape memory effect and crystallagraphy of both the powder and the sintered TiNi specimens were extensively characterized. The specimen sintered at a temperature of 700° showed high porosity and partial densification, but with apparent shape memory effect. By contrast, the specimens sintered at higher sintering temperatures above 900°C showed high density, but experienced extensive oxidation with teh resulting loss of the shape memory effect. High temperature sintering resulted in significant solid-state inter-diffusion of atoms and thus the formation of different intermetallic phases, such as NiTi2 and Ni3Ti. The phase transformation temperatures and enthalpies for the samples sintered at 700 and 800°C increased with increasing temperature. In addition, the differences between the start and finish transformation temperatures for the sintered specimens appear to be significantly narrower compared to those of the nano-powder.
Original languageEnglish
Pages (from-to)9-17
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5275
DOIs
Publication statusPublished - 29 Mar 2004

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