Modelling strength and ductility of ultrafine grained BCC and FCC alloys using irreversible thermodynamics

Huang, M. and Rivera-Díaz-del-Castillo, P. E J and Bouaziz, O. and Van Der Zwaag, S. (2009) Modelling strength and ductility of ultrafine grained BCC and FCC alloys using irreversible thermodynamics. Materials Science and Technology, 25 (7). pp. 833-839. ISSN 0267-0836

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Abstract

A novel grain size dependent strain hardening model is derived from the theory of irreversible thermodynamics. The model yields the evolution of the dislocation densities in the grain interior and at the grain boundary, as well as their contributions to the flow stress. It is found that submicron grain sizes have a lower dislocation density in the grain interior, causing ductility to decrease greatly. The predicted stress-strain curve shapes, uniform elongation and ultimate tensile strength values for interstitial free steels (body centred cubic) and aluminium alloys (AA1100, face centred cubic) show good agreement with experimental observations.

Item Type:
Journal Article
Journal or Publication Title:
Materials Science and Technology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2211
Subjects:
ID Code:
125496
Deposited By:
Deposited On:
24 May 2018 14:12
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Sep 2020 04:57