Actually, micromechanical approaches give only few references related to glide mechanisms in a lamella and especially load transfer mechanism between lamellae in pearlites. At large strains the concept of interphase barrier has to be introduced and considered as the determinant mechanism of hardening compared with the classical bulk work hardening. A micromechanical approach is used to describe a hardening mechanism related to the growth of dislocation loops inside the ferritic lamellae of pearlite and their locking at the interphase boundary. Using Eshelby-Kro¨ner’s formalism for the resolution of the field equations, the calculation of the Helmholtz free energy related to the (internal) morphological variables allows finding driving forces and the strength of interactions between loops and interfacial walls. Results exhibit a linear dependence between the critical stress and the inverse of the true interlamellar spacing, through a lattice orientation factor relative to the lamellar interphase, as observed experimentally (J. Gil Sevillano, 1991, J. Phys. III, 1, pp. 967–988; G. Langford, 1977, Metallurgical Trans A, 8A, pp. 861–875.
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April 2001
Technical Papers
Micromechanical Approach of Lamellar Nano-Composites: Influence of the Microstructure on the Yield Strength
R. Krummeich,
R. Krummeich
Laboratoire de Physique et Me´canique des Mate´riaux, Institut Supe´rieur de Ge´nie Me´canique et Productique, UMR CNRS 7554, Ile du Saulcy, Universite´ de Metz, 57045 Metz Cedex 01-France
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H. Sabar,
H. Sabar
Laboratoire de Physique et Me´canique des Mate´riaux, Institut Supe´rieur de Ge´nie Me´canique et Productique, UMR CNRS 7554, Ile du Saulcy, Universite´ de Metz, 57045 Metz Cedex 01-France
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M. Berveiller
M. Berveiller
Laboratoire de Physique et Me´canique des Mate´riaux, Institut Supe´rieur de Ge´nie Me´canique et Productique, UMR CNRS 7554, Ile du Saulcy, Universite´ de Metz, 57045 Metz Cedex 01-France
Search for other works by this author on:
R. Krummeich
Laboratoire de Physique et Me´canique des Mate´riaux, Institut Supe´rieur de Ge´nie Me´canique et Productique, UMR CNRS 7554, Ile du Saulcy, Universite´ de Metz, 57045 Metz Cedex 01-France
H. Sabar
Laboratoire de Physique et Me´canique des Mate´riaux, Institut Supe´rieur de Ge´nie Me´canique et Productique, UMR CNRS 7554, Ile du Saulcy, Universite´ de Metz, 57045 Metz Cedex 01-France
M. Berveiller
Laboratoire de Physique et Me´canique des Mate´riaux, Institut Supe´rieur de Ge´nie Me´canique et Productique, UMR CNRS 7554, Ile du Saulcy, Universite´ de Metz, 57045 Metz Cedex 01-France
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division July 22, 1999; revised manuscript received December 18, 1999. Associate Editor: H. Zbib.
J. Eng. Mater. Technol. Apr 2001, 123(2): 216-220 (5 pages)
Published Online: December 18, 1999
Article history
Received:
July 22, 1999
Revised:
December 18, 1999
Citation
Krummeich , R., Sabar , H., and Berveiller, M. (December 18, 1999). "Micromechanical Approach of Lamellar Nano-Composites: Influence of the Microstructure on the Yield Strength ." ASME. J. Eng. Mater. Technol. April 2001; 123(2): 216–220. https://doi.org/10.1115/1.1286159
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