Creep behavior of a polycrystalline nickel aluminide : Ni-23.5 at.% A1-0.5 at.% Hf-0.2 at.% B
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
---|---|
Pages (from-to) | 68-72 |
Journal / Publication | Journal of Materials Research |
Volume | 1 |
Issue number | 1 |
Publication status | Published - Jan 1986 |
Externally published | Yes |
Link(s)
Abstract
The creep behavior of a polycrystalline nickel aluminide with the composition Ni-23. 5 at. % Al-0. 5 at. % Hf-0. 2 at. % B has been measured as a function of stress, temperature, and grain size. At high stresses, of the order of 100 MPa, the strain rate is nonlinear in the stress, with a stress exponent greater than two. Below approximately 10 MPa, at 1033 K, the steady-state strain rate is almost proportional to the stress, indicating that diffusional creep is rate controlling. Calculations of expected Nabarro-Herring and Coble creep rates did not answer whether diffusive mass transport through the grains, or along the grain boundaries, is rate controlling. The grain-size dependence of the strain rate, however, indicates predominance of volume diffusion control, i.e., Nabarro-Herring creep, for our experimental conditions.
Citation Format(s)
Creep behavior of a polycrystalline nickel aluminide: Ni-23.5 at.% A1-0.5 at.% Hf-0.2 at.% B. / Schneibel, J. H.; Petersen, G. F.; Liu, C. T.
In: Journal of Materials Research, Vol. 1, No. 1, 01.1986, p. 68-72.
In: Journal of Materials Research, Vol. 1, No. 1, 01.1986, p. 68-72.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review