Fracture energy evaluation on 7075-T651 aluminum alloy welds determined by instrumented impact pendulum
作者： R.R. AMBRIZ , D. JARAMILLO , C. GARCÍA , F.F. CURIEL
DOI: 10.1016/S1003-6326(16)64157-2
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摘要: Abstract By using an instrumented impact pendulum, the force versus time curves of 7075-T651 aluminum welds were obtained from standard Charpy-V samples. Considering force–time and constant velocity, fracture energies for different zones quantified. A energy improvement HAZ (33.6 J) was observed in comparison with weld metal (7.88 J), base (5.37 J 7.37 longitudinal transverse directions, respectively). This toughness increment attributed to microstructural transformation caused by thermodynamic instability η′ precipitates during welding. Fracture higher than that metal, probably due pores created solidification. Regarding dynamic yielding curves, approximation yield strength weld, determined. surfaces revealed intergranular failure direction, whereas a predominately brittle (cleavage) some insights ductile characteristics direction. In contrast, HAZ.
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