Enhancement of fatigue life of Ni-Ti-Fe shape memory alloys by thermal cycling

被引：20

作者：

Giri, Sushi K. ^{[1
]}

Krishnan, Madangopal ^{[2
]}

Ramamurty, U. ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India

[2] Bhabha Atom Res Ctr, Div Mat Sci, Bombay 400085, Maharashtra, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 528卷 / 01期

关键词：

Shape memory alloy; Fatigue; Martensitic phase transformation; Plastic deformation; Thermal cycling; MARTENSITIC-TRANSFORMATION; DEFORMATION-BEHAVIOR; STRESS; TEXTURE; STRAIN; PSEUDOELASTICITY; MICROSTRUCTURE; TEMPERATURES; WIRES;

D O I：

10.1016/j.msea.2010.09.006

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of thermal cycling on the load-controlled tension-tension fatigue behavior of a Ni-Ti-Fe shape memory alloy (SMA) at room temperature was studied. Considerable strain accumulation was observed to occur in this alloy under both quasi-static and cyclic loading conditions. Though, in all cases, steady-state is reached within the first 50-100 cycles, the accumulated steady-state strain, epsilon(p.ss), is much smaller in thermally cycled alloy. As a result, the fatigue performance of them was found to be significantly enhanced vis-a-vis the as-solutionized alloy. Furthermore, under load-controlled conditions, the fatigue life of Ni-Ti-Fe alloys was found to be exclusively dependent on epsilon(p.ss). Observations made by profilometry and differential scanning calorimetry (DSC) indicate that the 200-500% enhancement in fatigue life of thermally cycled alloy is due to the homogeneous distribution of the accumulated fatigue strain. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：363 / 370

页数：8

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