Ultrasonic attenuation by dislocation formation in NiTi shape memory alloys

M. Kaack; I. Delgadillo-Holtfort; T. Yohannes; J. Pelzl

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Ultrasonic attenuation by dislocation formation in NiTi shape memory alloys

机译：NiTi形状记忆合金中位错形成引起的超声波衰减

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Dislocations are induced in polycrystalline NiTi shape memory alloy by thermal and mechanical cycling. The variation of the ultrasonic velocity and the attenuation with frequency in the range 2-60 MHz was measured at room temperature. The frequency dependent experimental data are well described in the frame of a vibrating string-model. The fits yield length and density of the dislocations in cycled and non-cycled samples. Depositing the sample at 300 K for a couple of days leads to a reduction of the dislocation density accompanied with an increase of the transition temperature.

机译：通过热和机械循环在多晶NiTi形状记忆合金中引起位错。在室温下测量超声波速度的变化和频率在2-60 MHz范围内的衰减。频率相关的实验数据在振动弦模型的框架中得到了很好的描述。拟合可得出循环和非循环样品中位错的长度和密度。将样品在300 K下沉积两天会导致位错密度降低，同时转变温度升高。

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《Materials Science and Engineering. A, Structural Materials》 |2004年第2期|p.119-121|共3页
作者
M. Kaack; I. Delgadillo-Holtfort; T. Yohannes; J. Pelzl;
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作者单位

Department for NDT, Mannesmann Research Institute, D-47259 Duisburg, Germany;

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原文格式 PDF
正文语种 eng
中图分类工程材料学;
关键词
dislocations; NiTi shape memory alloys; ultrasound;

机译：位错;NiTi形状记忆合金;超声;

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Ultrasonic attenuation by dislocation formation in NiTi shape memory alloys

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