期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 27, 期 11, 页码 1072-1076出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/S1005-0302(11)60188-6
关键词
Electromigration; Interfacial segregation; Prestrain; Dislocation; Vacancy
资金
- National Natural Science Foundation of China [51171191]
- National Basic Research Program of China [2010CB631006]
- Natural Science Foundation of Liaoning Province, China [20092076]
Plastic prestraining was applied to a solder interconnect to introduce internal defects such as dislocations in order to investigate the interaction of dislocations with electromigration damage. Above a critical prestrain, Bi interfacial segregation to the anode, a clear indication of electromigration damage in SnBi solder interconnect, was effectively prevented. Such an inhibiting effect is apparently contrary to the common notion that dislocations often act as fast diffusion paths. It is suggested that the dislocations introduced by plastic prestraining acted as sinks for vacancies in the early stage of the electromigration process, but as the vacancies accumulated at the dislocations, climb of those dislocations prompted recovery of the deformed samples under current stressing, greatly decreasing the density Of dislocation And vacancy in the solder, leading to slower diffusion of Bi atoms.
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