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Wear properties of shock-consolidated amorphous and microcrystalline Ni-38 wt % Mo−8 wt % Cr-1. 5 wt % B alloy powders

Published online by Cambridge University Press:  31 January 2011

Thad Vreeland Jr. ,
Naresh N. Thadhani ,
Andrew H. Mutz ,
Susan P. Thomas  and
Roger K. Nibert
Thad Vreeland Jr.
Affiliation:
Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125
Naresh N. Thadhani
Affiliation:
Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125
Andrew H. Mutz
Affiliation:
Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125
Susan P. Thomas
Affiliation:
Roy C. Ingersoll Research Center, Borg-Warner Corporation, Des Plaines, Illinois 60018
Roger K. Nibert
Affiliation:
Roy C. Ingersoll Research Center, Borg-Warner Corporation, Des Plaines, Illinois 60018
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Abstract

Powder flakes prepared from 50/um thick melt-spun ribbons of Markomet 1064 (Ni52.5 Mo38 Cr8 B 1.5 wt %) were shock consolidated in the unannealed and annealed condition. The unannealed powder flakes (microhardness 933 kg/mm2) are amorphous while flakes annealed at 900°C for 2 h have a fcc crystal structure, with a microcrystalline grain size of 0.3 μm and microhardness of 800 kg/mm2. The shock-consolidated amorphous powder compact (∼250 kJ/kg shock energy) shows no crystal peaks in an x-ray diffractometer scan. Compacts of annealed powder (400–600 kJ/kg shock energies) contain amorphous material (18%–21%), which was rapidly quenched from the melt formed at interparticle regions during the consolidation process. The microhardness of the amorphous interparticle material is 1100 kg/mm2. Wear properties of the compacts measured in the low velocity friction apparatus (LVFA) pin-on-disk tests show low average friction values (−0.03). The 60 h cumulative wear appears to correlate with the energy of shock compaction rather than the metallic glass content. The Falex ring-on-block test also showed that both the Markomet amorphous compact and the compact containing a mixture of amorphous and microcrystalline phases performed almost equally and wore half as much as the base-line SAE-01 steel-polished sample.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 5 , October 1986 , pp. 661 - 666
Copyright
Copyright © Materials Research Society 1986

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References

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