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A physical model revealing strong strain hardening in nano-grained metals induced by grain size gradient structure

Date:2015-05-11Jianjun LiSource:

A theoretical model has been developed, which reveals the underlying correlation between the strong extra strain hardening achieved in the nano-grained layers of the grain size gradient structure and the non-uniform deformation of the lateral surface in surface nano-crystallized materials, based on some existing experimental observations and the concept of geometrically necessary dislocations. The proposed model led to the establishment of a simple physical law that can be expressed as H* = A*, where H* and A* are two dimensionless parameters. The former represents the extra strain hardening, while the latter characterizes the non-uniform deformation of the lateral surface. The values of these two parameters can be measured through experiments.

http://dx.doi.org/10.1016/j.msea.2014.09.117

This work was supported by the National Natural Science Foundation of China (NSFC) (11402203), the Fundamental Research Funds for the Central Universities (3102014JCQ01039) and the Start-up Funds for the Newly-recruited High-level Talents from Northwestern Polytechnical University, China. S.C. thanks the support from NSFC through Grants #11125211, #11372317 and the 973 Nano-project (2012CB937500). A.K. Soh acknowledges the support of the Advanced Engineering Programme and School of Engineering, Monash University Malaysia, as well as the eScience Grant (Project no.: 06-02-10-SF0195) provided by the Ministry of Science, Technology and Innovation (MOSTI), Malaysia.

 

Li JJ,Chen SH,Wu XL,et al. A physical model revealing strong strain hardening in nano-grained metals induced by grain size gradient structure[J]. Materials Science & Engineering A,2015-01-03,620:16-21.