کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1445251 1509578 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High resolution mapping of strain localization near twin boundaries in a nickel-based superalloy
ترجمه فارسی عنوان
نقشه برداری با وضوح بالا از محلی سازی کرنش در نزدیکی مرز دوقلو در ابررسانای مبتنی بر نیکل
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

Damage during cycling loading of polycrystalline metallic alloys involves localized plastic straining at the scale of individual grains. To better understand damage accumulation processes and to build models for material behavior there is a need for quantitative assessment of the heterogeneous strain fields at the grain and even more microscopic scales. In the present study, a digital image correlation (DIC) approach has been developed to measure the strains at the grain level and at finer scales where plastic strain localization is manifested as physical slip bands. Strain fields have been measured in situ and ex situ on a René 88DT polycrystalline nickel-based superalloy to assess the grain-scale deformation processes during monotonic straining in tension and compression. DIC analysis and transmission electron microscopy demonstrate that slip occurs in a highly localized manner. The highest localized strains developed in slip bands that formed on {1 1 1} planes parallel to, and slightly offset from, annealing twins. Enhanced local straining below yield was observed during compression loading. The degree of strain concentration caused by slip bands impinging on grain boundaries was also analyzed. The results are compared to predictions of plasticity models.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 98, 1 October 2015, Pages 29–42
نویسندگان
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