Mechanical behavior of freeze-cast Ti foams with varied porosity

Titanium (Ti) foams with relative densities of 0.32, 0.37, and 0.49 were processed via freeze casting. The mechanical characteristics samples different porosities studied in uniaxial compression tests at initial strain rates between 0.001 0.5 s−1. According to the results, stress–strain response does not significantly depend on rate, least up applied maximum stress, which corresponds 0.1–0.3 engineering strain. In-situ acoustic emission (AE) experiments have revealed that stress drop beyond formation propagation macrocracks. However, cracks also initiated below particularly, higher densities. analysis Young's modulus yield strength versus porosity exhibits a power law relationship high exponent (approximately 4–5). This is reasonable if decrease level associated change deformation mechanism from model Gibson–Ashby (GA) 0.37 density.