| Issue |
J. Phys. Colloques
Volume 51, Number C1, Janvier 1990
Proceeding of the International CongressIntergranular and Interphase Boundaries in materials |
|
|---|---|---|
| Page(s) | C1-275 - C1-280 | |
| DOI | https://doi.org/10.1051/jphyscol:1990143 | |
DOI: 10.1051/jphyscol:1990143
THEORETICAL STUDY ON THE INCOHERENT TWIN BOUNDARIES IN AUSTENITIC STAINLESS STEEL
M. MORI1, K. MASUDA-JINDO2, K. TANAKA1 et I. ISHIDA11 Institute of Industrial Science, University of Tokyo, 7-22-1, Roppongi, Minato-ku, Tokyo 106, Japan
2 Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Abstract
The structure of incoherent Σ=3 (112) twin boundaries in the austenitic stainless steel is investigated using the tight-binding recursion method and the model fcc iron crystal. To estimate the change in the total energy due to the atomic displacements, 15 pairs of recursion coefficients (an, bn ; n≤15) are calculated for the atomic clusters containing 2100 atoms : The short-range repulsive energy contribution is also taken into account using the Born-Mayer potential. It is found that the significant rigid body translation occurs parallel to the boundary plane together with the excess volume displacements for the (112) incoherent twin boundaries in γ-Fe. The occurence of the rigid body translation is shown to result from the reduced density of heavily distorted bonds and reduced local d-band deformation around the incoherent twin boundary.