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ASTM Selected Technical Papers
M3D: Mechanics and Mechanisms of Material Damping
By
VK Kinra
VK Kinra
1Aerospace Engineering Department,
Texas A&M University
,
College Station, TX 77843
;
symposium chairman and editor
.
Search for other works by this author on:
A Wolfenden
A Wolfenden
2Mechanical Engineering Department,
Texas A&M University
,
College Station, TX 77843
;
symposium chairman and editor
.
Search for other works by this author on:
ISBN-10:
0-8031-1495-8
ISBN:
978-0-8031-1495-1
No. of Pages:
591
Publisher:
ASTM International
Publication date:
1992

Internal friction measurements were performed in different grades of tungsten carbide-cobalt (WC-Co) cemented carbides from room temperature to 1300 K. The results show that WC-Co exhibits an internal friction spectrum composed mainly of a relaxation peak and a high-temperature exponential background. It is shown that these two components are caused by damping mechanisms that take place in the cobalt phase. These damping mechanisms are interpreted by the movements of dissociated dislocations dragging tungsten atoms that are in solution between the partial dislocations. At low temperatures, the dislocations are widely dissociated, they cannot move, the internal friction is weak, and the material is brittle. At high temperatures, the stacking fault area between the partial dislocations is reduced, the dislocations become mobile, the internal friction peak appears, and the material is more tough. The internal friction peak therefore gives reason for the “brittle-to-tough” transition of the composite material.

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20.
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Mari
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Proceedings
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,
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, No.
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,
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1977
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