Qualitative study the effect of conditions milling of 95.5Sn/4.0Ag/0.5Cu, (wt%) nanopowder

The SAC-405, Sn-4.0Ag-0.5Cu (wt%) nanopowders, which has potential applications in microelectronics, such as lead-free solder, were obtained by high energy milling. The purpose of this study was to investigate the structural changes of the SAC-405 produced by high energy milling with times of 12, 24 and 48, under an atmosphere of hydrogen and power grinding 40:1. The crystallite size and micro-deformations of the nanopowders was measured by X-ray diffraction (XRD) using Rietveld method. Preliminary results show that it is possible to obtain nanopowders by mechanical alloying for the SAC-405 alloy with average particle size of 10 ∼ 18 nm. There are also strong indications of a reduction of ∼ 7 deg C melting temperature of the dust that is characteristic of nano-sized particles. (author)