کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1759743 1019295 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Composition dependence of the elastic constants of β-phase and (α + β)-phase PdHx
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم آکوستیک و فرا صوت
پیش نمایش صفحه اول مقاله
Composition dependence of the elastic constants of β-phase and (α + β)-phase PdHx
چکیده انگلیسی

We have measured the composition and temperature dependence of the shear moduli C′ and C44 for two-phase (α + β)- and single-phase β-PdHx. In the two-phase region, the α- and β-phases are coherent. Here, the composition dependence of C44 and C′ deviate negatively from a Vegard-type volume average. We attribute the deviations to two effects: (1) the partly in-series arrangement of the precipitate and matrix phases, relative to the externally applied stress, and (2) thermally activated anelastic relaxations involving the rapid motion of H interstitial atoms, leading to slight changes in the shape of coherent precipitates. The first effect is present for both C′ and C44 and is temperature-independent, whereas the second is present only for C′ and is strongly temperature-dependent.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 50, Issue 2, February 2010, Pages 155–160
نویسندگان
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