The behavior of the ASTM F1058 wrought cobalt-chromium-nickel-molybdenum-iron alloy (commonly referred to as Elgiloy or Phynox) is evaluated in terms of mechanical properties, magnetic resonance imaging, corrosion resistance, and biocompatibility. The data found in the literature, the experimental corrosion and biocompatibility results presented in this article, and its long track record as an implant material demonstrate that the cobalt superalloy is an appropriate material for permanent surgical implants that require high yield strength and fatigue resistance combined with high elastic modulus, and that it can be safely imaged with magnetic resonance.

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Pacific Northwest LaboratoryRichland, Washington 99352 UMT-0207 PNL-4132 UC-70 7b Moisture Content Distribution for Rock Cover, Dry Year (1976) Climate Data--3rd Simulation Year. 21 Sa Moisture Storage with Rock Cover, Wet Year (1979) Climate Data--2nd Simulation Year 23 Bb Moisture Storage with Rock Cover, Wet Year (1979) Climate Data--3rd Simulation Year 23 vii 9a Moisture Storage with Rock Cover, Dry Year {1976) Climate Data--2nd Simulation Year 9b Moisture Storage with Rock Cover, Dry Year (1976) Climate Data--3rd Simulation Year TABLES

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