کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1580061 | 1645418 | 2009 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen diffusion in the Laves-phase compound TiCr1.78
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Hydrogen diffusion in the Laves-phase compound TiCr1.78 Hydrogen diffusion in the Laves-phase compound TiCr1.78](/preview/png/1580061.png)
چکیده انگلیسی
The temperature dependence of the Young's modulus and of the internal friction (IF) has been investigated between 80 and 300 K at acoustical frequencies in the hexagonal (C14) Laves-phase TiCr1.78 charged with hydrogen. In this compound H occupies tetrahedral interstitial sites which are grouped in interlinked hexagons. A mechanical relaxation has been found at around 120 K (f = 5.4 kHz), which appears to be due to tunnelling transitions of delocalized H from one hexagon to the other. The rate of H absorption has been investigated at high temperature (660-1200 K) and the H diffusion coefficient has been derived from the pressure measurement as a function of time. A cumulative Arrhenius plot of IF and absorption diffusion data exhibits a non-exponential behaviour, which is due to a change in the diffusion mechanism from over-barrier hopping at high temperature to phonon-assisted tunnelling at low temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volumes 521â522, 15 September 2009, Pages 139-142
Journal: Materials Science and Engineering: A - Volumes 521â522, 15 September 2009, Pages 139-142
نویسندگان
G. Mazzolai, B. Coluzzi, A. Biscarini, F.M. Mazzolai, A. Tuissi, F. Agresti, G. Principi, S. Lo Russo,