Evaluation of AA 2050-T87 Al-Li Alloy Crack Turning Behaviour

Chellman, D. J.; Balmuth, E.S.; Philbrook, Mike; Smith, Karen P.; Cho, Alex; Niedzinski, Michael; Muzzolini, Raphael; Feiger, Jim

doi:10.4028/www.scientific.net/msf.519-521.1323

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…Compare to conventional Al alloys, they typically possess lower density, higher elastic modulus and improved fatigue crack growth resistance. 2050 alloy is one of the 3rd generation AleLi alloys targeting static and fatigue properties to be equal or better than 7050 alloy with 4% density reduction and 5% elastic modulus enhancement [1]. Heretofore, 2050 AleLi alloy has many applications in transport aircraft from wing spars and ribs to other internal structures in wings and fuselages [2].…”

Section: Introductionmentioning

confidence: 99%

Dynamic restoration mechanism and physically based constitutive model of 2050 Al–Li alloy during hot compression

Zhu

Liu

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Dynamic restoration mechanism and physically based constitutive model of 2050 Al–Li alloy during hot compression

Zhu

Liu

et al. 2015

Journal of Alloys and Compounds

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“…Así mismo, la presencia de Li disminuye el peso de la aleación en aproximadamente 3% en comparación con las otras aleaciones de aluminio (Crill et al, 2006;Warner, 2006;Li et al, 2008;Guérin et al, 2015). Dentro de este grupo de aleaciones, se destaca la aleación AA2050-T8 que, debido a su excelente combinación de resistencia, densidad, resistencia a la fatiga, estabilidad térmica y tenacidad, se ha convertido en candidata atractiva en aplicaciones aeronáuticas que requieren alta resistencia específica y excelente tolerancia al daño (Lequeu et al, 2010;Malard et al, 2015;Li et al, 2016).…”

Section: Introductionunclassified

Síntesis, caracterización y evaluación de la resistencia a la corrosión de recubrimientos híbridos Sol-Gel base TEOS/MPS sobre la aleación AA2050-T8

et al. 2017

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RESUMEN:El presente trabajo tuvo como objetivo sintetizar, caracterizar y evaluar la resistencia a la corrosión de recubrimientos híbridos sol-gel base TEOS/MPS, sintetizados sobre la aleación AA2050-T8 (Al-Cu-Li) bajo diferentes condiciones experimentales de polimerización, tales como solvente y tiempo de envejecimiento, así como diferentes relaciones molares de los precursores inorgánico tetraetoxisilano (TEOS) e híbrido 3-metacriloxipropiltrimetoxisilano (MPS). Se monitoreó la evolución de los soles durante el proceso de envejecimiento mediante espectroscopía infrarroja (FT-IR) y ensayos reológicos. Los recubrimientos se obtuvieron mediante dip-coating y fueron caracterizados a través de microscopía electrónica de barrido (MEB-EDX). La evaluación de la resistencia a la corrosión se realizó mediante ensayos de polarización anódica potenciodinámica, en solución aireada 0,1 M de NaCl. Los resultados obtenidos revelaron que, de los tres solventes evaluados, el etanol es el que permite mejor estabilización del precursor híbrido y favorece el proceso de polimerización de los grupos metacrilato del precursor MPS. Por otra parte, la variación de la relación molar TEOS:MPS conlleva a la obtención de recubrimientos más homogéneos y continuos al incrementar la relación del precursor inorgánico. Finalmente, todos los recubrimientos sintetizados mejoraron la resistencia a la corrosión de la aleación AA2050-T8, en especial los sintetizados bajo la relación TEOS:MPS 80:20. ABSTRACT: Synthesis, characterisation and corrosion resistance of TEOS/MPS hybrid sol-gel coatings deposited on the AA2050-T8 alloy. The aim of the present work was to synthesize, characterise and evaluate the corrosion resistance of TEOS/MPS hybrid sol-gel coatings applied on the AA2050-T8 aluminium alloy attending to two experimental variables: the sol synthesis conditions (type of solvent and aging time), and the inorganic/hybrid (TEOS/MPS) ratio. The aging process was monitored by infrared spectroscopy (FTIR) and viscosity measurements. The hybrid coatings were obtained by dip-coating and then characterized by scanning electron microscopy (SEM-EDX). The evaluation of corrosion resistance was performed by anodic potentio dynamic polarization testing in aerated 0.1 M NaCl solution. The results showed that ethanol as solvent promoted better stabilization of the hybrid precursor and favoured polymerization of the

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“…One of the most complex examples of orthotropic behaviour is the macroscopically anomalous crack paths in high strength Al-Li based [3][4][5][6][7][8] and Al-Zn-Mg based alloys [9,10] under fatigue loading conditions, see Figure 1 (Al-Cu-Li alloy AA2297-T8) and Figure 2 (AA7050-T651 plate). The lack of a fully verified model for this behaviour hampers efficient design with these materials [11], leading to overly conservative designs, or avoidance of materials exhibiting the strongest orthotropic behaviour.…”

Section: Introductionmentioning

confidence: 99%

Assessment of mixed mode loading on macroscopic fatigue crack paths in thick section Al–Cu–Li alloy plate

2016

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High strength, wrought 7xxx (Al-Zn-Mg) and Al-Li based alloys show a propensity for fatigue macroscopic crack deflections aligned along grain boundaries. The present work reports a study on a 3 rd generation Al-Li based alloy in the form of a thick AA2297 (Al-Cu-Li alloy) plate, where it was found that although the lithium containing material may indeed be more susceptible to mixed mode grain boundary failure (and by implication crack deflection in conventional tests), the AA2297 alloy fatigue behaviour is mechanistically and functionally equivalent to 7xxx alloy behaviour. It is shown that crack paths are controlled by a combination of crack loading mixity (K II /K I ratio) and maximum strain energy release rates (expressed as K eq.max ). Increasing K II /K I ratio is seen to favour sustained grain boundary failure. Crack growth rate behaviour is discussed in terms of extrinsic and intrinsic components of crack growth resistance. It is shown that the present approach can be successfully applied to predict crack deflection / crack paths for a range of sample geometries and orientations on a range of high strength orthotropic aluminium alloys, including 3 rd generation Al-Li based alloys and well-established 7xxx alloys).

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Evaluation of AA 2050-T87 Al-Li Alloy Crack Turning Behaviour

Cited by 11 publications

References 4 publications

Dynamic restoration mechanism and physically based constitutive model of 2050 Al–Li alloy during hot compression

Dynamic restoration mechanism and physically based constitutive model of 2050 Al–Li alloy during hot compression

Síntesis, caracterización y evaluación de la resistencia a la corrosión de recubrimientos híbridos Sol-Gel base TEOS/MPS sobre la aleación AA2050-T8

Assessment of mixed mode loading on macroscopic fatigue crack paths in thick section Al–Cu–Li alloy plate

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