The effects of yttrium ion implantation on the oxidation of nickel-chromium alloys. 1. The microstructures of yttrium implanted nickel-chromium alloys

Journal Article · Sat Aug 01 00:00:00 EDT 1992 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF00665048· OSTI ID:6999910

Hampikian, J M ^[1]; Potter, D I ^[2]

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1. Georgia Inst. of Technology, Atlanta (United States)
2. Univ. of Connecticut, Storrs (United States)

Yttrium ions of 150 keV energy were implanted into the alloys Ni-20Cr, Ni-4Cr, and into nickel. The microstructures were then characterized using transmission electron microscopy, selected area channeling patterns and backscattered electron images. Low yttrium fluences did not alter the microstructures of No-20Cr. However, fluences of 1 [times] 10[sup 16], 5 [times] 10[sup 16], and 7.5 [times] 10[sup 16] caused the crystalline structures of the alloy to be replaced by an amorphous phase. Fluences of 7.5 [times] 10[sup 16] Y[sup +]/cm[sup 2] also rendered Ni-4Cr and nickel amorphous. Self-ion implantation experiments on Ni-20Cr did not cause the amorphous phase to form. The depth distribution of elements Ni-20Cr following yttrium ion implantation was determined by Auger electron spectroscopy. This showed in addition to the added yttrium a surface depletion in nickel concentration and a simultaneous enrichment in chromium concentration. At approximately 500 [angstrom], the chromium concentration is approximately 32 at.%. This depletion/enrichment zone extends throughout the implanted layer. Annealing the Ni-20Cr in vacuum for one hour at 600C resulted in the recrystallization of Ni-Cr solid solution and the formation of very fine grains of Y[sub 2]O[sub 3]. Annealing at 800C for 5 minutes showed recrystallized Ni-Cr, Y[sub 2]O[sub 3], and an additional phase or phases.

• OSTI ID: 6999910
• Journal Information: Oxidation of Metals; (United States), Vol. 38:1-2; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM ALLOYS
ION IMPLANTATION
MICROSTRUCTURE
NICKEL BASE ALLOYS
AMORPHOUS STATE
ANNEALING
AUGER ELECTRON SPECTROSCOPY
BACKSCATTERING
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
OXIDATION
RECRYSTALLIZATION
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM
YTTRIUM OXIDES
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ELEMENTS
HEAT TREATMENTS
INFORMATION
METALS
MICROSCOPY
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
360106* - Metals & Alloys- Radiation Effects
360102 - Metals & Alloys- Structure & Phase Studies