期刊
PHILOSOPHICAL MAGAZINE
卷 96, 期 32-34, 页码 3379-3395出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2016.1224945
关键词
Size effect; copper; high temperature deformation; mu-Laue diffraction
类别
资金
- Austrian Science Fund FWF [P25325-N20]
- Austrian Science Fund (FWF) [P 25325] Funding Source: researchfish
As the length scale of sample dimensions is reduced to the micron and sub-micron scales, the strength of various materials has been observed to increase with decreasing size, a fact commonly referred to as the 'sample size effect'. In this work, the influence of temperature on the sample size effect in copper is investigated using in situ microcompression testing at 25, 200 and 400 degrees C in the SEM on vacuum-annealed copper structures, and the resulting deformed structures were analysed using X-ray mu Laue diffraction and scanning electron microscopy. For pillars with sizes between 0.4 and 4 mu m, the size effect was measured to be constant with temperature, within the measurement precision, up to half of the melting point of copper. It is expected that the size effect will remain constant with temperature until diffusion-controlled dislocation motion becomes significant at higher temperatures and/or lower strain rates. Furthermore, the annealing treatment of the copper micropillars produced structures which yielded at stresses three times greater than their un-annealed, FIB-machined counterparts.
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