Study of toughening mechanisms through the observations of crack propagation in nanostructured and layered metallic sheet

被引：11
作者：
Chen, A. Y. [2 ,3 ]
Li, D. F. [3 ]
Zhang, J. B. [4 ]
Liu, F. [2 ]
Liu, X. R. [2 ]
Lu, J. [1 ]
机构：
[1] City Univ Hong Kong, Dept Mfg Engn & Engn Management, Hong Kong, Hong Kong, Peoples R China
[2] Shanghai Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China
[3] Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China
[4] Baosteel Technol Ctr, Shanghai 201900, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 29-30期
基金：
中国国家自然科学基金;
关键词：
Nanostructured materials; Interface structure; Crack propagation; Toughening mechanism; FRACTURE-TOUGHNESS; NANOCRYSTALLINE METALS; RESIDUAL-STRESS; DEFORMATION; INTERFACE; STRENGTH; DUCTILITY; BEHAVIOR; SUPERPLASTICITY; TEMPERATURE;
D O I：
10.1016/j.msea.2011.07.063
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：8389 / 8395
页数：7
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