Direct determination of radiation damage profiles in the order-disorder alloys Ni/sub 4/Mo and Pt/sub 3/Co irradiated with 500 to 2500 eV Ne/sup +/ ions

Technical Report · Mon Oct 01 00:00:00 EDT 1979

DOI:https://doi.org/10.2172/5551944· OSTI ID:5551944

Aidelberg, J.

Radiation damage produced in the order-disorder alloys Ni/sub 4/Mo and Pt/sub 3/Co by low-energy (500-2500 eV) Ne/sup +/ ions has been observed directly, on an atomic scale, employing the field-ion microscope (FIM) technique. A new approach was developed to determine the radiation damage distribution in these alloys. In the case of the alloy Ni/sub 4/Mo the measurements were based on the contrast differences between the FIM images of an ordered alloy, which were completely regular, and a disordered alloy which appeared as a random array of image points. FIM specimens of the ordered alloy Ni/sub 4/Mo were irradiated in situ at 30/sup 0/K, and the side of the specimen exposed to the beam became disordered as a result of the implantation of the neon atoms. The change from an ordered state to a disordered state was detected by the controlled dissection of the specimen, on an atom-by-atom basis, employing the pulse field-evaporation technique. The amount of disordered metal, which was field-evaporated, to expose the perfectly ordered lattice, and some basic geometric relations gave the depth of radiation damage: the depth resolution was approx. = 2 A. A crystallographic directional dependence of the mean depth of radiation damage (anti x/sub d/) was observed and was attributed to the effect of channeling. For the non-channeling direction the value of anti x/sub d/ varied from approx. = 6 to approx. = 19 A as the irradiation energy was increased from 500 to 2000 eV. The experimental anti x/sub d/ versus Ne/sup +/ ion energy relation agreed with the theoretical predictions of Winterbon, Sigmund and Sanders, and the results of the Monte Carlo computer simulation program, of Biersack and Haggmark, called TRIM.

• Research Organization: Cornell Univ., Ithaca, NY (USA). Materials Science Center
• DOE Contract Number: EY-76-S-02-3158
• OSTI ID: 5551944
• Report Number(s): COO-3158-81; TRN: 80-003270
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MOLYBDENUM ALLOYS
PHYSICAL RADIATION EFFECTS
NIOBIUM BASE ALLOYS
COBALT ALLOYS
PLATINUM BASE ALLOYS
ANNEALING
DAMAGE
DEPTH
ELASTICITY
INTERMETALLIC COMPOUNDS
ORDER-DISORDER TRANSFORMATIONS
RECORDING SYSTEMS
SAMPLE PREPARATION
ALLOYS
DIMENSIONS
HEAT TREATMENTS
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
PHASE TRANSFORMATIONS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
RADIATION EFFECTS
TENSILE PROPERTIES
360106* - Metals & Alloys- Radiation Effects