Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 26, Issue 4, Pages 974-983Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(16)64157-2
Keywords
7075-T651 welded joint; instrumented Charpy pendulum; force-time curve; fracture energy; dynamic yield strength
Categories
Funding
- CONACyT [CB 177834]
- SIP-IPN
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By using an instrumented impact pendulum, the force versus time curves of 7075-T651 aluminum welds were obtained from standard Charpy-V samples. Considering the force-time curves and constant impact velocity, the fracture energies for different zones were quantified. A fracture energy improvement for the HAZ (33.6 J) was observed in comparison with the weld metal (7.88 J), and base metal (5.37 J and 7.37 J for longitudinal and transverse directions, respectively). This toughness increment was attributed to the microstructural transformation caused by the thermodynamic instability of eta' precipitates during the welding. Fracture energy for weld metal was higher than that for base metal, probably due to pores created during solidification. Regarding the dynamic yielding force obtained from the force-time curves, an approximation to the dynamic yield strength for weld, HAZ and base metal was determined. Fracture surfaces revealed an intergranular failure for base metal in longitudinal direction, whereas a predominately brittle failure (cleavage) with some insights of ductile characteristics was observed for the transverse direction. In contrast, a ductile failure was observed for weld metal and HAZ.
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