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Proceedings Paper

Characteristics of TiNi shape memory alloy processed by vacuum plasma spray
Author(s): Hiroyuki Nakayama; Minoru Taya; Ronald W. Smith; Travis Nelson; Michael Yu; Edwin Rosenzweig
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Paper Abstract

TiNi shape memory alloy has been used in many application fields due to its excellent shape memory effect (SME) and superelasticity (SE). However, it is difficult and costly to machine TiNi alloy into complex shapes due to its low ductility. To address this problem, one approach is near-net shape processing by vacuum plasma spraying (VPS). In this study, the transformation behavior, mechanical properties and microstructure of TiNi alloy processed by VPS method are studied. The as-sprayed and homogenized TiNi alloy exhibited compositional variations in the sample, though both samples exhibited a single TiNi phase with low transformation temperatures, below 170 K Aging the homogenized sample at 773 K for 18 ks led to an increase in the transformation temperature, resulting in good transformation behavior. Specifically, DSC measurement revealed clear transformation peaks due to Martensite, austenite and R-phase transitions. Compression testing of a sample aged at 773 K for 18 ks exhibited a good SME below Mf and superelasticity (SE) above Af. The recoverable strain due to SME and SE were more than 2.4 % and 5.0 %, respectively. TEM studies confirmed that aTi3Ni4 precipitate was formed by aging at 773 K for 18 ks.

Paper Details

Date Published: 6 April 2006
PDF: 9 pages
Proc. SPIE 6170, Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics, 61702A (6 April 2006); doi: 10.1117/12.658573
Show Author Affiliations
Hiroyuki Nakayama, Univ. of Washington (United States)
Minoru Taya, Univ. of Washington (United States)
Ronald W. Smith, Materials Resources International (United States)
Travis Nelson, Materials Resources International (United States)
Michael Yu, Naval Air Systems Command (United States)
Edwin Rosenzweig, Naval Air Systems Command (United States)

Published in SPIE Proceedings Vol. 6170:
Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics
William D. Armstrong, Editor(s)

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