کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1447877 988658 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct observation of the NiTi martensitic phase transformation in nanoscale volumes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Direct observation of the NiTi martensitic phase transformation in nanoscale volumes
چکیده انگلیسی

We report on quantitative in situ transmission electron microscopy nanocompression tests used to study the deformation behavior of NiTi pillars on the nanometer scale. By recording the diffraction patterns in real time we have obtained direct evidence that the stress-induced B2 to B19′ (austenite to martensite) transformation exists in NiTi even when the sample size is below 200 nm. Correlation of the appearance of the B19′ phase in the diffraction pattern with our quantitative data showed that the transformation starts at approximately 1 GPa. We found that the transformation occurred through a multi-step process, and that the reverse transformation did not occur due to extensive deformation of the B19′ phase. Our results have direct implications for the application of the shape memory effect in nanoscale NiTi devices.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 58, Issue 2, January 2010, Pages 490–498
نویسندگان
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