Spinodal-like decomposition of Fe-Ni and Fe-Ni-Cr alloys in both radiation and non-radiation environments
The radiation-induced development of spinodal-like compositional fluctuations in Fe-Ni-Cr invar alloys leads to several fortuitous methods of visualizing the three-dimensional nature of the decomposition process. In low dose neutron-irradiated Fe-Ni-Cr specimens, the use of high electropolishing rates during preparation of microscopy foils leads to a preferential attack of those regions which are low in nickel. In high dose ion-bombarded specimens of Fe-35Ni, the absence of chromium leads to formation of cellular martensite in the nickel-poor regions upon cooling to room temperature. The scale of the fluctuations at temperatures >600/sup 0/C is comparable to that found in the Santa Catharina meteorite, which is roughly Fe-35%Ni in composition. This and other non-radiation data support the proposal that the Fe-Ni system in the absence of irradiation tends to spinodally decompose in the invar regime but at a very sluggish rate. Thus it appears that radiation accelerates rather than induces the decomposition of Fe-Ni and Fe-Ni-Cr invar alloys.
- Research Organization:
- Hanford Engineering Development Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76FF02170
- OSTI ID:
- 6776541
- Report Number(s):
- HEDL-7633; ON: DE87005496
- Country of Publication:
- United States
- Language:
- English
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ALLOYS
BEAMS
CHROMIUM ALLOYS
ION BEAMS
IRON ALLOYS
IRON BASE ALLOYS
IRRADIATION
NICKEL ALLOYS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SWELLING