Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 319, Issue -, Pages 375-378Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(01)00989-3
Keywords
nickel-base superalloy; room temperature yielding; order strengthening; critical resolved shear stress
Ask authors/readers for more resources
The isothermal aging behavior of the cuboidal ordered gamma' precipitates of the cast nickel-based superalloy IN 100 was investigated at temperatures between 800 and 1000degreesC. Despite the complication connected with morphological changes of the gamma' particle microstructure due to coarsening and raft formation a classical Ostwald ripening law was confirmed. Comparing the calculated critical resolved shear stress (CRSS) increase with the experimental data exhibits the functional dependencies on the mean gamma' size as predicted by theory [B. Reppich, in: R.W. Cahn et al. (Eds.), Materials Science and Technology, vol. 6, in: H. Mughrabi (Ed.), Plastic Deformation and Fracture of Materials, Wiley-VCH, Weinheim. Germany, 1993, pp. 311-357]: (a) a parabolic increase of the CRSS for cutting of fine under-aged gamma' particles (weak pair-coupling) (b) a transition to cutting by strongly pair-coupled dislocations for increasing particle sizes: and (c) a deviation from the hyperbolic CRSS decrease due to strong pair-coupled cutting towards Orowan by-passing for non-coupled single dislocations at over-aged particles. (C) 2001 Elsevier Science B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available