Effects of Annealing and Preheating on the Impact Response of Selected Braze Materials

摘要

A series of gas-gun experiments has probed the planar (uniaxial strain) impact response of six different commercial brazing alloys that were subjected to a peak shock stress in the range of 5.5 – 7.2 GPa. The alloys studied were copper + gold (65/35 wt%), copper + gold (50/50 wt%), Cusil?, Nicusil?-3, Nicoro? + titanium (98/2 wt%), and silver zirconate. Both as-received and annealed samples of each alloy were tested under ambient (room temperature) and preheated (100 C) initial conditions. Velocity interferometer data acquired during this investigation have been evaluated to determine the dynamic yield strength (i.e., Hugoniot Elastic Limit), shock Hugoniot state, and spall strength for baseline alloy samples (i.e., unheated, as-received material) and for samples whose initial condition involved annealing and/or preheating.