期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 64, 期 -, 页码 26-39出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2014.07.001
关键词
Dislocations; Grain boundaries; Strengthening mechanisms; Metallic material; Hall-Petch
资金
- Interuniversity Attraction Poles Program - Belgian State - Belgian Science Policy [P7/21]
The mechanical behavior of metallic materials deeply depends on the size of samples. For specimen dimensions decreasing from a few millimeters to a few micrometers, the general observed trend is a softening of the mechanical behavior in tension which affects the stress level and the strain hardening. The objective of this work is to provide new experimental results in order to analyze the miniaturization size effects for various stress paths without strain gradients across the thickness of the samples. To this aim, experimental tensile tests, large tensile tests and shear tests have been performed on Ni sheets with various grain sizes. Results show that the miniaturization softening is affected by triaxiality, the larger is this parameter, the lower is the mechanical softening. These features seem to be linked to surface effects which are larger for low triaxiality stress paths. From an industrial point of view, it is hence possible to improve the forming of microparts using suitable stress paths. (C) 2014 Elsevier Ltd. All rights reserved.
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