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

被引：19
|
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
收藏
页码：363 / 370
页数：8
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