Shape memory characteristics of Ti49.5Ni25Pd25Sc0.5 high-temperature shape memory alloy after severe plastic deformation

被引：67

作者：

Atli, K. C. ^{[1
]}

Karaman, I. ^{[1
,2
]}

Noebe, R. D. ^{[3
]}

Garg, A. ^{[3
]}

Chumlyakov, Y. I. ^{[4
]}

Kireeva, I. V. ^{[4
]}

机构：

[1] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

[2] Texas A&M Univ, Mat Sci & Engn Program, College Stn, TX 77843 USA

[3] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

[4] Siberian Phys Tech Inst, Tomsk 634050, Russia

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 12期

基金：

美国国家科学基金会;

关键词：

Martensitic transformation; High-temperature shape memory alloys; Equal channel angular extrusion; Severe plastic deformation; Dimensional stability; PHASE-TRANSFORMATIONS; CYCLIC REVERSIBILITY; TITANIUM NICKELIDE; SITE PREFERENCE; HEAT-TREATMENT; NITI; BEHAVIOR; ENHANCE; RECRYSTALLIZATION; ADDITIONS;

D O I：

10.1016/j.actamat.2011.04.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A Ti49.5Ni25Pd25Sc0.5 high-temperature shape memory alloy is thermomechanically processed to obtain enhanced shape-memory characteristics: in particular, dimensional stability upon repeated thermal cycles under constant loads. This is accomplished using severe plastic deformation via equal channel angular extrusion (ECAE) and post-processing annealing heat treatments. The results of the thermomechanical experiments reveal that the processed materials display enhanced shape memory response, exhibiting higher recoverable transformation and reduced irrecoverable strain levels upon thermal cycling compared with the unprocessed material. This improvement is attributed to the increased strength and resistance of the material against defect generation upon phase transformation as a result of the microstructural refinement due to the ECAE process, as supported by the electron microscopy observations. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4747 / 4760

页数：14

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