Investigation on Crack Tip Transformation in NiTi Alloys: Effect of the Temperature

被引：25
|
作者：
Sgambitterra E. [1 ]
Maletta C. [1 ]
Furgiuele F. [1 ]
机构：
[1] Department of Mechanical, Energy and Management Engineering, University of Calabria, P. Bucci 44C, Rende, 87036, CS
来源：
Shape Mem. Superelast. | / 2卷 / 275-283期
关键词：
Digital image correlation; Fracture; Nanoindentation; NiTi alloys; Shape memory; Stress-induced martensitic transformation;
D O I：
10.1007/s40830-015-0018-z
中图分类号：
学科分类号：
摘要：
The effect of the temperature on crack tip transformation in Nickel–Titanium (NiTi) shape memory alloys was analyzed in this work by means of experimental and analytical approaches. In particular, single edge crack specimens were analyzed for two different values of the testing temperature in the pseudoelastic regime of the alloy, i.e., T = 298 K and T = 338 K. The thermal-dependent phase transition mechanisms occurring at the crack tip region were studied by analyzing data obtained from digital image correlation as well as by nanoindentation experiments performed near the crack tip. Finally, experimental results were compared with predictions of a recent analytical model. Results revealed that an increase in temperature causes a decrease of the phase transformation zone and that both the techniques are well suitable in capturing the thermal effect on the phase transformation mechanisms near the crack tip. © 2015, ASM International.
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页码：275 / 283
页数：8
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