Skip to main content Accessibility help
×
Home

<111> Slip in Nial Single Crystals Between 4.2K and 100K

  • Y. Q. Sun (a1), G. Taylor (a1), R. Darolia (a2) and P. M. Hazzledine (a3)

Abstract

Slip in <111> directions is a deformation mode found in many intermetallic compounds ordered into the B2 (CsCl) structure, but in NiAl it is active only under the limiting conditions of uniaxial loading along <100> and low testing temperatures. This paper investigates the deformation characteristics of <100> oriented NiAl tested between 4.2K and 300K. Compression tests have shown that below about 100K, deformation takes place by slip in <111> directions without kinking, whereas between 100K and 300K kinking in the form of shearing on {100} becomes the dominant mode of plastic deformation, occurring usually near one or both ends of the compression samples. The yield stress has been found to exhibit a normal decrease with temperature, but at a rate that is smaller than most bcc metals. The sensitivity of the flow stress to strain-rate changes is also characteristically small, giving activation volumes around b 3, b being the Burgers vector of a<111> superdislocation. Both slip line observations and transmission electron microscopy have shown slip mainly on {110} near 80K, but with increasing activity on {112} and cross-slip between {110} and {112} with the lowering of temperature to 4.2K.

Copyright

References

Hide All
1. Loretto, M.H. and Wasilewski, R.J., Phil. Mag., 23, 1311 (1971).
2. Miracle, D.B., Acta metall., 41, 649 (1993).
3. Field, R.D., Lahrman, D.F. and Darolia, R., Acta metall., 39, 2951 (1991).
4. Yamaguchi, M. and Umakoshi, Y., Progress in Materials Science, 34, 1 (1990).
5. Veyssiere, P. and Noebe, , Phil. Mag., 65A, 1 (1992).

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed