کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7975070 | 1514669 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interplay between sample size and grain size: Single crystalline vs. ultrafine-grained chromium micropillars
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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: Interplay between sample size and grain size: Single crystalline vs. ultrafine-grained chromium micropillars Interplay between sample size and grain size: Single crystalline vs. ultrafine-grained chromium micropillars](/preview/png/7975070.png)
چکیده انگلیسی
To gain insights into the influence of the microstructure on the strengthening behaviour in confined volumes, single crystalline (sxx) and ultrafine-grained (ufg) Cr micropillars were investigated using in-situ scanning electron microscope microcompression tests. Post-compression images of the sxx pillars indicate crystallographic slip, while the ufg pillars reveal a bulk-like deformation behaviour and an emergence of grains from the sample surface. Stress-strain curves of sxx samples show intermittent flow and a scaling behaviour agreeing well with other bcc metals investigated previously. Also for ufg samples a size-dependent strength with a reduced but non-negligible scaling exponent is determined. This latter ufg size effect contributes to an increasing influence of near-surface grains controlling plastic flow with decreasing pillar diameter. While for micron-sized pillars the strength differs between the two microstructures, the two scaling trends converge for sub-micron pillars with diameters close to the grain size, indicative of a transition from boundary-mediated to single crystal plasticity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 674, 30 September 2016, Pages 626-633
Journal: Materials Science and Engineering: A - Volume 674, 30 September 2016, Pages 626-633
نویسندگان
R. Fritz, V. Maier-Kiener, D. Lutz, D. Kiener,