| Issue |
J. Phys. IV France
Volume 112, October 2003
|
|
|---|---|---|
| Page(s) | 213 - 216 | |
| DOI | https://doi.org/10.1051/jp4:2003868 | |
J. Phys. IV France 112 (2003) 213
DOI: 10.1051/jp4:2003868
Martensite crystallography and elastic-stiffness coefficients
H. Ledbetter1 and M. Dunn21 Materials Science and Engineering Laboratory, National lnstitute of Standards and Technology, Boulder, CO 80305, U.S.A.
2 Mechanical Engineering Department, University of Colorado, Boulder, CO 80309, U.S.A.
Abstract
We considered the effect of the elastic-stiffness coefficients on the martensite crystallographic features, especially the
habit plane. We approached the problem with an elastic-energy-minimization inclusion model. As shown previously, this model
agrees exactly with the WLR-BM invariant-plane-strain theories when elastic stiffness is neglected and strain energy equals
zero. As a first example, we considered the large-strain Fe-31Ni (fcc to bcc) transformation. Second, we considered a small-strain
example: In-23Ti (fcc to fct). Finally, we considered the A15 compound Nb
3Sn (bcc to bct), which shows soft-mode behavior during cooling, where the
C'= (C11-C12/2 elastic stiffness essentially vanishes, leading to a near-zero shear modulus. All three cases yielded the same result: the
habit plane shows no response to elastic softening or stiffening.
© EDP Sciences 2003