Influence of applying external stress during aging on martensitic transformation and the superelastic behavior of a Ni-rich NiTi alloy

被引：25

作者：

Abbasi-Chianeh, V. ^{[1
]}

Khalil-Allafi, J. ^{[1
]}

机构：

[1] Sahand Univ Technol, Fac Mat Engn, Adv Mat Res Ctr, Tabriz, Iran

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 15期

关键词：

Multi step martensitic transformation; NiTi shape memory alloys; Ni4Ti3; precipitates; Single variant precipitation; Superelasticity; SHAPE-MEMORY ALLOYS; COHERENT TI11NI14 PRECIPITATE; CONCENTRATION GRADIENTS; SINGLE-CRYSTALS; PHASE-ANALYSIS; MICROSTRUCTURE; GROWTH;

D O I：

10.1016/j.msea.2011.03.029

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Superelastic properties and martensitic transition temperatures of Ni50.9Ti shape memory wires were studied after aging under different applied stresses at 450 degrees C for 45 min. The results indicate that applying external stresses during aging of Ni50.9Ti shape memory wires changes the strain value and stress level of plateaus related to stress induced martensitic transformation. Furthermore, martensitic transformation sequences change after applying external stresses but transformation temperatures measured with DSC remain constant in samples aged under stresses up to 120 MPa. Applying stress of 60 MPa during aging enhances the superelastic properties by increasing the strain of plateaus during loading and unloading cycles. Applying stresses more than 60 MPa, decreases the strain of the plateau during unloading. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：5060 / 5065

页数：6

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