کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5145478 | 1497342 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In-situ characterization of hydrogen-induced defects in palladium by positron annihilation and acoustic emission
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: In-situ characterization of hydrogen-induced defects in palladium by positron annihilation and acoustic emission In-situ characterization of hydrogen-induced defects in palladium by positron annihilation and acoustic emission](/preview/png/5145478.png)
چکیده انگلیسی
Positron annihilation spectroscopy was employed for characterization of hydrogen-induced defects in Pd. Positron annihilation studies were performed in-situ during electrochemical hydrogen charging and were combined with measurement of acoustic emission, which is a non-destructive technique capable of monitoring of collective dislocation motion. It was found that hydrogen loading introduced defects into Pd lattice, namely vacancies and dislocations. At low concentrations (α-phase) hydrogen loading created vacancies associated with hydrogen. Stresses induced by growing α'-phase particles led to plastic deformation and introduced dislocations into the sample. Moreover, additional vacancies were introduced into the sample by crossing dislocations. Vickers hardness testing revealed that hydrogen absorbed in interstitial sites causes solid solution hardening. Further hardening was caused by dislocations when α'-phase particles are formed. Pd sample completely transformed into the α'-phase was subsequently unloaded. Decomposition of α'-phase particles during unloading caused further increase of dislocation density and led to an additional hardening. Loading-unloading of Pd sample with hydrogen continuously generates dislocations and makes the sample harder.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 42, Issue 35, 31 August 2017, Pages 22460-22467
Journal: International Journal of Hydrogen Energy - Volume 42, Issue 35, 31 August 2017, Pages 22460-22467
نویسندگان
J. ÄÞek, O. Melikhova, P. DobroÅ, P. HruÅ¡ka,