期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 29-30, 页码 8389-8395出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.07.063
关键词
Nanostructured materials; Interface structure; Crack propagation; Toughening mechanism
类别
资金
- Research Grants Council of the Hong Kong Special Administrative Region of China [CityU8/CRF/08]
- Hong Kong Innovation and Technology Commission (ITC) [ITP/004/08NP]
- National Natural Science Foundation of China [51074107]
- Municipal Education Committee of Shanghai [099Z225]
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. (C) 2011 Elsevier B.V. All rights reserved.
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