%0 Journal Article
%T LOW-FREQUENCY "AMPLITUDE PEAKS" IN THE INTERNAL FRICTION ASSOCIATED WITH THE INTERACTION OF SUBSTITUTIONAL SOLUTE ATOMS WITH DISLOCA-TIONS IN ALUMINIUM ALLOYS<br>
%J 金属学报
%D 1980
%I 
%X 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.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=1DC75E137A82114CBE2BB0D7CD938958&yid=E56875464B1C0EC1&vid=7801E6FC5AE9020C&iid=0B39A22176CE99FB&sid=AD16A18DBD734D13&eid=D6354F61445E9456&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=12