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| LOW-FREQUENCY "AMPLITUDE PEAKS" IN THE INTERNAL FRICTION ASSOCIATED WITH THE INTERACTION OF SUBSTITUTIONAL SOLUTE ATOMS WITH DISLOCA-TIONS IN ALUMINIUM ALLOYS |
| Ge Tingsui (T. S. Kê) Institute of Metal Research; Academia Sinica |
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Cite this article:
Ge Tingsui (T. S. Kê) Institute of Metal Research; Academia Sinica. LOW-FREQUENCY "AMPLITUDE PEAKS" IN THE INTERNAL FRICTION ASSOCIATED WITH THE INTERACTION OF SUBSTITUTIONAL SOLUTE ATOMS WITH DISLOCA-TIONS IN ALUMINIUM ALLOYS. Acta Metall Sin, 1980, 16(2): 218-230.
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Abstract Low-frequency "amplitude peaks" and "temperature peaks" were observed inthe internal friction of dilute Al-Cu nd Al-Mg alloys around room temperature ata maximum surface-strain amplitude ranging from 5×10~(-7) to 1×10~(-5). This nom-alous internal friction showed a peculiar aging behaviour. An aging peak wasobserved in conjunction with the mplitude eak and the temperature peak. Suchpeaks have been observed repeatedly in: (1) heavily cold-worked specimens an-nealed ust rior to complete recrystallization; (2) fully annealed specimens cold-worked just after yielding; (3) fully annealed pecimens quenched from anelevated temperature. It is shown that the observed internal friction is associated with the nterac-tion of solute atoms (Cu and Mg in Al) with the mobile "fresh" dislocations pro-duced by cold-work or quenching. uch fresh dislocations contain a large numberof kinks. A modified dislocation atmosphere model was suggested in which thesolute atoms are assumed to be dragged along between two potential valleys dur-ing the to and fro sidewise motion of a ink under the action of the appliedalternating stress.
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Received: 18 February 1980
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