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Title: The effects of reactive-element, ion-implantation-induced amorphous layers on the oxidation of Co-12Cr and Ni-12Cr alloys

Abstract

Nickel-chromium (Ni-12Cr, wt.%) and cobalt-chromium (Co-12Cr, wt.%) alloys were ion implanted with 150 keV yttrium to fluences that ranged between 2 {times} 10{sup 16} and 1 {times} 0{sup 17} ions/cm{sup 2}. The influence of the implantation on the microstructure of the alloy was determined. The effect of the highest dose implantation on the alloys` oxidation response at 1,000 C, 48 hr was measured. Both alloys contained an amorphous surface phase as a result of this fluence and one of the effects of oxidation was to recrystallize the amorphized alloy in the first few minutes of oxidation. The lower doses of 2 {times} 10{sup 16} ions/cm{sup 2} were sufficient to cause amorphization of both the Ni-12Cr and the Co-12Cr. The implantation reduced the isothermal mass gain by a factor of 25% for the Ni-12Cr, but had a negligible effect on the Co-12Cr alloy. Short-term oxidation of experiments at 600 C showed via transmission electron microscopy that, in the absence of the yttrium implant, the Ni-12Cr alloy forms NiO in the first minute of oxidation and the Co-12Cr alloy forms CoO and CoCr{sub 2}O{sub 4}. The implanted Ni-12Cr, on the other hand (1 {times} 10{sup 17} Y{sup +}/cm{sup 2}), forms recrystallized Ni-Cr,more » Y{sub 2}O{sub 3}, and NiO in the near-surface region, while the implanted Co-12Cr alloy forms CoO, CoCr{sub 2}O{sub 4}, and a recrystallized intermetallic alloy from the amorphized region.« less

Authors:
 [1]
  1. Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering
Publication Date:
OSTI Identifier:
655368
Resource Type:
Journal Article
Journal Name:
Oxidation of Metals
Additional Journal Information:
Journal Volume: 50; Journal Issue: 1-2; Other Information: PBD: Aug 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; OXIDATION; COBALT ALLOYS; NICKEL ALLOYS; CHROMIUM ALLOYS; YTTRIUM ADDITIONS; ION IMPLANTATION; TEMPERATURE DEPENDENCE; AMORPHOUS STATE; PHYSICAL RADIATION EFFECTS

Citation Formats

Hampikian, J M. The effects of reactive-element, ion-implantation-induced amorphous layers on the oxidation of Co-12Cr and Ni-12Cr alloys. United States: N. p., 1998. Web. doi:10.1023/A:1018828002557.
Hampikian, J M. The effects of reactive-element, ion-implantation-induced amorphous layers on the oxidation of Co-12Cr and Ni-12Cr alloys. United States. https://doi.org/10.1023/A:1018828002557
Hampikian, J M. 1998. "The effects of reactive-element, ion-implantation-induced amorphous layers on the oxidation of Co-12Cr and Ni-12Cr alloys". United States. https://doi.org/10.1023/A:1018828002557.
@article{osti_655368,
title = {The effects of reactive-element, ion-implantation-induced amorphous layers on the oxidation of Co-12Cr and Ni-12Cr alloys},
author = {Hampikian, J M},
abstractNote = {Nickel-chromium (Ni-12Cr, wt.%) and cobalt-chromium (Co-12Cr, wt.%) alloys were ion implanted with 150 keV yttrium to fluences that ranged between 2 {times} 10{sup 16} and 1 {times} 0{sup 17} ions/cm{sup 2}. The influence of the implantation on the microstructure of the alloy was determined. The effect of the highest dose implantation on the alloys` oxidation response at 1,000 C, 48 hr was measured. Both alloys contained an amorphous surface phase as a result of this fluence and one of the effects of oxidation was to recrystallize the amorphized alloy in the first few minutes of oxidation. The lower doses of 2 {times} 10{sup 16} ions/cm{sup 2} were sufficient to cause amorphization of both the Ni-12Cr and the Co-12Cr. The implantation reduced the isothermal mass gain by a factor of 25% for the Ni-12Cr, but had a negligible effect on the Co-12Cr alloy. Short-term oxidation of experiments at 600 C showed via transmission electron microscopy that, in the absence of the yttrium implant, the Ni-12Cr alloy forms NiO in the first minute of oxidation and the Co-12Cr alloy forms CoO and CoCr{sub 2}O{sub 4}. The implanted Ni-12Cr, on the other hand (1 {times} 10{sup 17} Y{sup +}/cm{sup 2}), forms recrystallized Ni-Cr, Y{sub 2}O{sub 3}, and NiO in the near-surface region, while the implanted Co-12Cr alloy forms CoO, CoCr{sub 2}O{sub 4}, and a recrystallized intermetallic alloy from the amorphized region.},
doi = {10.1023/A:1018828002557},
url = {https://www.osti.gov/biblio/655368}, journal = {Oxidation of Metals},
number = 1-2,
volume = 50,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 1998},
month = {Sat Aug 01 00:00:00 EDT 1998}
}