IMPACT TENSION PROPERTIES IN A2091 ALUMINUM-LITHIUM ALLOY

摘要

The impact tension behavior of 2091 aluminum alloy is investigated over a wide range of strain rates(1.0 X 10~(-6) to 830 s~(-1)) at room temperature. Yield and ultimate tensile strength increase with increasing strain rate. Fracture surface exhibits shear fracture with extensive delamination cracking, and is remarkably rough at high strain rates. The microcracks which are initiated at second phase particles are observed and quantified.