کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1608773 | 1005527 | 2015 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen-induced defects and multiplication of dislocations in Palladium
ترجمه فارسی عنوان
نقص های ناشی از هیدروژن و ضرب نفوذ در پالادیوم
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
چکیده انگلیسی
In the present work positron lifetime spectroscopy was employed for investigation of hydrogen-induced defects in Pd. Well annealed polycrystalline Pd samples were electrochemically charged with hydrogen and the development of defects with increasing hydrogen concentration was investigated. At low concentrations (α-phase region, xH < 0.017 H/Pd) hydrogen loading introduced vacancies surrounded by hydrogen atoms and characterized by a positron lifetime of â200 ps. When the hydrogen concentration exceeded 0.017 H/Pd the α-phase transformed into the hydrogen rich αâ²-phase. This generated dislocations characterized by a positron lifetime of â170 ps. Dislocations can accommodate a large volume mismatch between the α and the αâ²-phase. Hardness testing revealed that absorbed hydrogen made Pd harder. In the α-phase region hardness increased due to solid solution hardening caused by dissolved hydrogen. Dislocations created by the α to αâ²-phase transition caused strain hardening which led to an additional increase of hardness.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 645, Supplement 1, 5 October 2015, Pages S312-S315
Journal: Journal of Alloys and Compounds - Volume 645, Supplement 1, 5 October 2015, Pages S312-S315
نویسندگان
J. ÄÞek, O. Melikhova, I. Procházka,