Microstructural Development in Cold Sprayed Copper

Abstract

This study investigates microstructural alterations in copper powder during cold spraying. A highly nonhomogeneous structure was observed with average strains of almost 50% close to the interface. Large strains and high strain rates resulted in significant grain refinement and the formation of sub 100-nm grains. Deformation occurred by slip and twinning, the latter promoted by impurities in the copper feedstock. Thin foils from the deposits were studied by TEM analysis and cross-sections of deformed particles were made and examined using FIB-SEM techniques.

Process optimisation of cold spray Al coating on AZ91 alloy

“…34 In order to observe the individual particle impact behaviour, single pass tests were conducted. [35][36][37] Helium gas was used with stagnation pressures ranging from 0?48 to 0?76 MPa. Gas stagnation temperatures started at 25uC (room temperature) and increased to a range from 100 to 250uC.…”