Modulus and damping measurements in CoAl. [48. 5 - 52. 3 at % Co]

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5309116

Wolfenden, A; Harmouche, M R ^[1]

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1. Texas A M Univ., College Station (USA)

Polycrystalline specimens of B2 cobalt aluminumides of compositions (X) in the range 48.5 to 52.3 atomic % Co have been studied by the PUCOT (piezoelectric ultrasonic composite oscillator technique) for measurements of Young's modulus E and mechanical damping Q{sup {minus}1} as a function of temperature T in the range 300 to 1600 K. Both the temperature and composition dependences of modulus were found to be linear and the general relation E(X,T)=210.8+2.2X-0.08T was developed. Arrhenius plots of Q{sup {minus}1} for several alloys yielded activation energies in the range 0.3 to 0.4 eV. The results are discussed in terms of phase diagram confirmation and mechanisms.

• OSTI ID: 5309116
• Report Number(s): CONF-840909--
• Journal Information: TMS (The Metallurgical Society) Paper Selection; (USA), Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Vol. 56; ISSN TMPSA; ISSN 0197-1689
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ACTIVATION ENERGY
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
CHEMICAL COMPOSITION
COBALT ALLOYS
CRYSTALS
DAMPING
DIAGRAMS
ENERGY
HIGH TEMPERATURE
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
PHASE DIAGRAMS
POLYCRYSTALS
TEMPERATURE DEPENDENCE
VERY HIGH TEMPERATURE
YOUNG MODULUS