%0 Journal Article
%T INTERNAL FRICTION AND GRAIN BOUNDARY PRECIPITATION DURING THE AGING OF AN AL-CU ALLOY<br>铝铜合金在陈化时的内耗及晶粒间界沉淀
%A T S KE
%A <br>葛庭燧
%J 物理学报
%D 1950
%I 
%X The precipitation at the grain boundaries during aging at 200℃ of an Al-4% Cu alloy was studied by measurements of the internal friction associated with the viscous behavior of grain boundaries. This internal friction was measured also at 200℃ with a torsion pendulum having a frequency of about one cycle per second. The results showed that the internal friction first decreases with aging but starts to rise after an aging of 6 1/2 hours. At very long aging times, the internal friction decreases again as the aging proceeds. Such a change of internal friction indicates a corresponding change in the nature of the "precipitates" at the grain boundaries during aging. This is in conformity with the results of metallographic examinations. A preliminary understanding toward the nature of these "precipitates" was obtained on comparing the results of internal friction measurements with those of metallographic examination.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=3C64840682AC01D3&yid=A93AF80BA961E8FF&vid=DF92D298D3FF1E6E&iid=0B39A22176CE99FB&sid=6700D0D256586E73&eid=74011071555EB4E5&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=0