Effect of temperature on elastic constants and dislocation properties of Fe-30% Al single crystals
- Technische Univ. Hamburg-Harburg (Germany)
- Univ. Erlangen-Nuernberg (Germany). Inst. fuer Werkstoffwissenschaften
The elastic constants of Fe-30% Al single crystals were determined using a resonance technique over the temperature range, 293--1173 K, of the observed yield strength anomaly. While the elastic shear anisotropy, Zener`s factor, is high, A = 4.6--6.8, the factor related to a shear with respect to the <111> direction is rather low, M = 1.2--1.3, over the temperature range. The elastic anisotropy factors for dislocation width calculated for the edge and screw orientations of the {l_brace}110{r_brace}<111> slip give the ratio of K{sub e}S{sub 66}/K{sub e}/S{sub 44} = 2.4 at 773 K, suggesting that the mobility is significantly higher for edge than for screw character. In the absence of applied stress, a coplanar dissociation of two <111>/4 screw partials with the APB partly lying on {l_brace}110{r_brace}, and partly on {l_brace}112{r_brace}, is not likely in Fe-30% Al. For a more detailed study of dislocation micromechanics to explain deformation behavior of Fe-30% Al, discussion is given on the anisotropy of APB energies, the relationship of non-Schmid effect with the anisotropic coupling coefficients, and possible glide resistance associated with the unstable orientation of dislocation line tension.
- Sponsoring Organization:
- Alexander von Humboldt-Stiftung, Bonn (Germany); USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 554125
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 10 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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