Effect of palladium on the mechanical properties of Cu–Al intermetallic compounds
摘要:
There is growing interest in copper (Cu) wire bonding due to its significant cost savings over gold wire. However, concerns regarding package reliability and corrosion susceptibility have driven the industry to develop alternative materials. Recently, palladium coated copper (Pd-Cu) wire has been widely used in fine pitch applications as it is believed to improve reliability of copper wire bonds on aluminum (Al) pads. However, the effect of palladium on the mechanical properties and corrosion resistance of Cu and Cu-Al intermetallic compounds (IMCs) has not been studied in detail. In this paper, bulk alloys of Cu and Cu-Al alloys with different concentrations of Pd were studied. Among the three IMCs studied, CuAl (H similar to 8.5 GPa) was found much harder than CuAl2 and Cu9Al4 (H similar to 6.0 GPa). Young's moduli of CuAl and Cu9Al4 IMCs were around 155 GPa and are much stiffer than the one for CuAl2 (similar to 110 GPa). The addition of a few percent Pd only slightly increases the hardness and Young's modulus of the IMCs. (C) 2014 Elsevier B.V. All rights reserved.
Influence of high energy milling on the microstructure and magnetic properties of the Al–Cu–Fe phases: the case of the i-Al<sub>64</sub>Cu<sub>23</sub>Fe<sub>13</sub>quasicrystalline and the ω-Al<sub>70</sub>Cu<sub>20</sub>Fe<sub>10</sub>crystalline phases
作者:Mirtha Pillaca Quispe、Carlos V. Landauro、Milida Z. Pinto Vergara、Justiniano Quispe-Marcatoma、Chachi Rojas-Ayala、Víctor A. Peña-Rodríguez、Elisa Baggio-Saitovitch
DOI:10.1039/c5ra21093c
日期:——
The effect of mechanical milling in i-Al64Cu23Fe13quasicrystalline and ω-Al70Cu20Fe10crystalline phases is systematically investigated in the present work.