کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1623960 1516414 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The precipitation process in Mg–Ca–(Zn) alloys investigated by positron annihilation spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
The precipitation process in Mg–Ca–(Zn) alloys investigated by positron annihilation spectroscopy
چکیده انگلیسی

Coincidence doppler broadening (CDB) spectroscopy has been applied to study the precipitation process induced by aging in Mg–1.0 wt.% Ca and Mg–1.0 wt.% Ca–1.0 wt.% Zn alloys. In addition positron lifetime experiments and microhardness measurements have been performed. A peak centered at ∼11.5 × 10−3m0c is found in the CDB ratio spectra of the alloys aged at 473 K. It is attributed to annihilations with the core electrons of Ca. The results indicate the formation of a particle dispersion that hardens the alloys. This dispersion is correlated with the appearance of the peak attributed to Ca atoms. Zn atoms in the Mg matrix inhibit the formation of quenched-in vacancies bound to Ca atoms in the aged ternary alloy producing the dispersion refinement.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 463, Issues 1–2, 8 September 2008, Pages 62–66
نویسندگان
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