期刊
JOURNAL OF MATERIALS RESEARCH
卷 28, 期 12, 页码 1539-1552出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2013.139
关键词
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资金
- agency of the United States Government
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- Los Alamos National Laboratory [DE-AC52-06NA25396]
- Sandia National Laboratories [DE-AC04-94AL85000]
- United States Department of Energy's National Nuclear Security Administration
- DE-AC04-94AL85000
Nanocrystalline (NC) metals are known for having excellent strength but perceived to have poor ductility. Miniature tensile tests on NC Ni-Fe measured ultimate strengths of 2 GPa and elongations, by digital image correlation, of up to 10%. Detailed examination of the fracture surface revealed dimpled rupture and cross-section reduction up to 75%, suggesting an intrinsic ability for small grained Ni-Fe to accommodate plasticity. A survey of published studies on NC metals reveals that this behavior is quite common; despite low macroscopic elongation, NC metals often achieve extensive deformation suggesting good intrinsic ductility. Unfortunately, the common sheet-like configuration of NC tensile specimens muddies a simple evaluation of ductility based on elongation, since thin and wide geometries promote localized necking that expedites catastrophic failure. This paper presents a compact review of ductility concepts and literature to interpret the experimental ductility measurements of an electrodeposited nickel alloy.
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