کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1448469 988674 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deformation mechanisms in nanocrystalline palladium at large strains
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Deformation mechanisms in nanocrystalline palladium at large strains
چکیده انگلیسی

The mechanical behaviour and microstructure evolution of nanocrystalline palladium was investigated. Material with an initial grain size ∼10 nm was prepared by inert gas condensation. Instrumented high-pressure torsion straining was used to characterize the flow stress during plastic deformation to shear strains up to 300. A change in primary deformation mechanism was induced by stress-induced grain growth. For grain sizes <40 nm, grain boundary mediated processes (shear banding, grain boundary sliding and grain rotation) controlled the deformation, with dislocation slip, twinning, and grain boundary diffusion providing the accommodation. For larger grain sizes, the operative deformation mechanism was dislocation slip.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 57, Issue 11, June 2009, Pages 3391–3401
نویسندگان
, , , , , , , ,