Intrinsic and extrinsic size effects on deformation in nanolayered Cu/Zr micropillars: From bulk-like to small-volume materials behavior
作者： J.Y. Zhang , S. Lei , J. Niu , Y. Liu , G. Liu
DOI: 10.1016/J.ACTAMAT.2012.03.056
关键词: Size dependence 、 Small volume 、 Nucleation 、 Optics 、 Deformation (mechanics) 、 Materials science 、 Shear (geology) 、 Homogeneous 、 Composite material 、 Deformation mechanism 、 Extrusion
摘要: Abstract By using microcompression methodology, deformation of nanolayered Cu/Zr micropillars was systematically investigated within wide ranges intrinsic layer thickness (5–100 nm) and extrinsic sample size (300–1200 nm). The effect, effect their interplay were respectively revealed. Competition between the effects leads to experimental observation a critical ∼20 nm, above which is predominantly intrinsic-size-related insensitive size, while below two are comparable. underlying mechanisms proposed transform from bulk-like small-volume materials behavior. Deformation mode correspondingly transited homogeneous extrusion/barreling inhomogeneous shear banding, but competing modes coexist in range ∼50 20 nm. In regime deformation, dependence displayed that controlled by bands nucleation larger pillars propagation smaller pillars. A map developed clearly elucidate coupling on
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