Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14525
Title: Study of toughening mechanisms through the observations of crack propagation in nanostructured and layered metallic sheet
Authors: Chen, AY
Li, DF
Zhang, JB
Liu, F
Liu, XR
Lu, J
Keywords: Crack propagation
Interface structure
Nanostructured materials
Toughening mechanism
Issue Date: 2011
Publisher: Elsevier Science Sa
Source: Materials science and engineering a, 2011, v. 528, no. 29-30, p. 8389-8395 How to cite?
Journal: Materials Science and Engineering A 
Abstract: A layered and nanostructured (LN) 304 SS sheet was produced by combination of surface mechanical attrition treatment (SMAT) with warm co-rolling. The microstructure of LN sheet is characterized by a periodic distribution of nanocrystalline layers and micron-grained layers with a graded transition of grain size. Tensile test results show that exceptional properties of high yield strength and large elongation to fracture are achieved. A multiple interlaminar cracking was observed by scanning electron microscopy, which is induced by repeated crack initiation and propagation. The toughening mechanisms of the LN sheet are proposed to be controlling the crack propagation path by several strategies. The main cracks initiating at interface defects are arrested by large compressive residual stress, deflected by weak interface bonding and blunted by the graded grain size distribution.
URI: http://hdl.handle.net/10397/14525
DOI: 10.1016/j.msea.2011.07.063
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