کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9572494 | 1503715 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of lattice defects in the early stage of fatigue in iron by positron annihilation techniques
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Positron annihilation lifetime (PAL) and Doppler broadening (DB) techniques have been performed to identify defects, such as vacancy clusters and dislocations, and to study their distributions on the sample in the early stage of fatigue cycle (0-10% of cycles to failure) in pure Fe. From two-lifetime component analysis, the component of the longer lifetime of about 130Â ps, corresponding to a mono-vacancy on edge dislocation, has been observed from 0.01% Nf fatigue. However, the long lifetime component of about 200Â ps appears in 10% Nf fatigue at a certain position of the sample. Vacancy clusters have possibly been formed to some extent at this fatigue life. The results suggest that the generation of micro-cracks during fatigue test is related to the formation of three-dimensional vacancy clusters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 242, Issues 3â4, 15 April 2005, Pages 304-312
Journal: Applied Surface Science - Volume 242, Issues 3â4, 15 April 2005, Pages 304-312
نویسندگان
F. Hori, K. Koike, R. Oshima,