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- W2124137865 abstract "Effects of the electrical flame off (EFO) and ultrasound (US) parameters on the work hardening behavior of Pd coated Cu (PCC) free air ball (FAB) are presented and compared to those of bare Cu reported in the literature. The FABs are characterized using an online deformability method that measures in situ deformed ball height ( H DEF ). The levels of EFO current ( I EFO ) of 65, 100 and 160 mA with adjusted EFO time ( t EFO ) are used to make 40 μm diameter FABs in two different shielding gases, resulting in six experimental conditions. In a first experiment, a total of 135 samples are produced for each condition and then deformed under a 400 mN deformation force ( F D ) without superimposing US. PCC FABs produced in nitrogen gas using I EFO and t EFO of 160 mA and 0.120 ms, respectively, are more deformable, having H DEF 7.1–9.2% less compared to those produced with I EFO = 100 mA and t EFO = 0.218 ms. However, the FABs produced with the higher current vary more than those with lower current, and FABs produced with forming gas vary least. H DEF of PCC FABs made in forming gas is independent of I EFO in the range from 65 to 160 mA. In a second experiment, the same conditions are used except for a 20% US level (equivalent to 29 mW US power) superimposed on F D during the deformation. The values of H DEF with US is 5.7–11.7% and 6.5–9.0% smaller than those of without US for the I EFO ranging from 65 to 160 mA in nitrogen and forming gas, respectively." @default.
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- W2124137865 date "2012-11-01" @default.
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- W2124137865 title "Effect of EFO parameters and superimposed ultrasound on work hardening behavior of palladium coated copper wire in thermosonic ball bonding" @default.
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- W2124137865 doi "https://doi.org/10.1016/j.microrel.2012.03.030" @default.
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