The effects of yttrium ion implantation on the oxidation of nickel-chromium alloys. 2. Oxidation of yttrium implanted Ni-20Cr

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

DOI:https://doi.org/10.1007/BF00665049· OSTI ID:6999906

Hampikian, J M ^[1]; Potter, D I ^[2]

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

Yttrium ions were implanted into an alloy of nickel containing 20 wt.% chromium. The oxidation weight gains of the implanted alloy, as well as unimplanted Ni-20Cr, were measured in 1 atm. of oxygen at temperatures between 815C and 1,100C. Though a yttrium fluence of 2 [times] 10[sup 15] ion/cm[sup 2] increased the weight gained at a given time for the implanted alloy compared to the unimplanted alloy, a fluence of 7.5 [times] 10[sup 16] ions/cm[sup 2] considerably retarded the oxidation process. This retardation was caused both by a reduction in the duration of transient oxidation and by a reduction in the rate of parabolic oxidation that follows the transient stage. Examination of oxidized specimens revealed that the higher fluence yttrium implantation caused an earlier formation of Cr[sub 2]O[sub 3], thus shortening the time during which NiO forms and contributing to the reduced time and weight gain during transient oxidation. This accelerated formation of Cr[sub 2]O[sub 3] is explained by reference to the yttrium-implantation-induced amorphous phase present on the alloys, the formation of small grains of nickel-chromium solid solution within this amorphous phase, and the presence of NiCr[sub 2]O[sub 4] at the oxide/gas interface. Potential causes of the reduced rates of parabolic oxidation are also discussed.

• OSTI ID: 6999906
• 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
OXIDATION
NICKEL BASE ALLOYS
AMORPHOUS STATE
CHROMATES
CHROMIUM OXIDES
CORROSION RESISTANCE
EXPERIMENTAL DATA
NICKEL COMPOUNDS
NICKEL OXIDES
SCANNING ELECTRON MICROSCOPY
SOLID SOLUTIONS
TRANSMISSION ELECTRON MICROSCOPY
WEIGHT
YTTRIUM
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
DATA
DISPERSIONS
ELECTRON MICROSCOPY
ELEMENTS
INFORMATION
METALS
MICROSCOPY
MIXTURES
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360106* - Metals & Alloys- Radiation Effects
360105 - Metals & Alloys- Corrosion & Erosion