NDLI: Damage Mechanisms in Nanolayered Metallic Composites

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Misra, A. Kung, H. Hammon, D. Hoagland, R. G. Nastasi, M.
Copyright Year	2002
Abstract	The strengths of metallic multilayers, composed of alternating layers of soft metals such as Cu and Nb, approach the theoretical limit of material strength when the bilayer periods are on the order of a few nanometers. We have investigated the damage mechanisms in these ultra-high strength nanolayered composite materials subjected to monotonic deformation. Large strain plastic deformation such as room temperature rolling does not lead to any dislocation cell structure formation within the layers indicating that the deformation and dislocation storage mechanisms in nanostructured materials are completely different from the bulk. In bulk metals, dislocation pile-ups lead to heterogeneous slip, but in nano-materials, deformation by single dislocations on closely spaced glide planes results in more homogeneously distributed slip. The implications of the high tensile strengths and homogeneous slip on the fatigue properties of nanolayered materials are also discussed.
Sponsorship	Microelectromechanical Systems
Starting Page	577
Ending Page	582
Page Count	6
File Format	PDF
ISBN	0791836428
DOI	10.1115/IMECE2002-32395
Volume Number	Microelectromechanical Systems
Conference Proceedings	ASME 2002 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2002-11-17
Publisher Place	New Orleans, Louisiana, USA
Access Restriction	Subscribed
Subject Keyword	Strength (materials) Temperature Deformation Composite materials Storage Metals Nanomaterials Damage Fatigue properties Metallic composites Dislocations
Content Type	Text
Resource Type	Article

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