Characterization of phases, tensile properties, and fracture toughness in aircraft‐grade aluminum alloys

Chemin, Aline Emanuelle Albuquerque; Afonso, Conrado Ramos Moreira; Pascoal, Fernando Antonio; Maciel, Carla Isabel dos Santos; Ruchert, Cassius Olívio Figueiredo Terra; Filho, Waldek Wladimir Bose

doi:10.1002/mdp2.79

Cited by 12 publications

(22 citation statements)

References 35 publications

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“…With the increase of the Al content and the primary α-Al dendrites, the ductility increases significantly, such as the Al 92 Cu 5.6 Si 2.4 alloy exhibits an engineering strain of 10% with a relatively high tensile strength of 500 MPa. These excellent mechanical properties of the present alloys are comparable to those of AA2050-T84 and AA7050-T7451 alloys, which are widely used as aircraft-grade aluminum alloys for their high strength and low weight [3]. Moreover, the alloys in this study are as cast without heat treatment.…”

Section: Resultssupporting

confidence: 54%

“…Al alloys have attracted much attention over the past decades due to their excellent specific strength, corrosion resistance, formability and low cost, and have been widely used in the realms of aviation, aerospace and automotive [1][2][3]. To further improve the strength, precipitation strengthening is the main strategy and widely used, especially for the 2xxx and 7xxx series Al alloys.…”

Section: Introductionmentioning

confidence: 99%

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The novel low cost as-casting Al-based composites with high strength and ductility

Yun

Pan

Rui

et al. 2020

Mater. Res. Express

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In this paper, three alloys .4 were prepared by a simple solidification process. By controlling the alloy composition, different microstructures and mechanical properties have been achieved. The Al 81 Cu 13 Si 6 alloy with micro-scale binary eutectic compositions embedded in an ultrafine ternary eutectic matrix exhibits the high yield strength (up to 750 MPa) but fails with a brittle fracture. While the Al 92 Cu 5.6 Si 2.4 alloy with hypereutectic composite structure exhibits the optimum comprehensive mechanical properties with both high tensile strength and ductility. The present results provide a new perspective to prepare Al-based alloy with high strength and ductility by designing the some new composite with optimum microstructure.

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Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

The novel low cost as-casting Al-based composites with high strength and ductility

Yun

Pan

Rui

et al. 2020

Mater. Res. Express

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“…Aluminum alloys (Al) of the 2xxx series have Copper (Cu) and Lithium (Li) as the main alloying elements and require heat treatments of solubilization, precipitation and aging to improve your mechanical properties. Specifically, the Al-Cu-Li 2050 ternary alloy has density of 2.71 g∕cm 3 [8] through the technique of scanning electron microscopy (SEM) as shown in Figure 1. The authors evidenced the formation of precipitates rich in Mg, Zn, Cu and Mn in the grain boundary, which promote reducing of mechanical properties and fracture toughness.…”

Section: Microstructural Features Of 2050-t84 Alloymentioning

confidence: 99%

“…Meta-stable formation: the growth is not fully established, however, is determined by the exposure of the free surface of the metal and by the geometry of the boundary defined during the breakage of the film passive oxide; Figure 2. Imagem de MET evidenciando a zona livre de precipitados da liga de alumio-lítio 2050-T84 [8].…”

Section: Effects Of Corrosion On Alloy 2050-t84mentioning

confidence: 99%

“…In addition to the development complexity of the corrosion fatigue testing methodology, the fatigue crack growth presents adverse behavior in some moments. The crack increases rapidly and in others, cases remain at the same length for hours or even days [3][4][5][6][7][8][9][10][11][12][13]. Interpretation for the fast growth crack, due to the embrittlement of metal alloys subjected to corrosion fatigue, is based on the mechanism of hydrogen embrittlement.…”

Section: Corrosion Fatigue In Aluminum-copper-lithium Alloy 2050-t84mentioning

confidence: 99%

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Corrosion Fatigue of Aluminum-Copper-Lithium Alloy 2050-T84 Submitted at Salt Spray and Aqueous Saline Solution

Santos¹,

Wladimir²,

Ruchert³

2020

Strength of Materials

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Interest in the improvement of the structural performance of aircraft has begun in the substitution of aluminum alloys due to the possibility of reduction of density, an increase of stiffness, high fracture toughness, greater resistance to the propagation of cracks by fatigue and greater resistance to corrosion. In these issues, the aluminum-copper-lithium alloy 2050-T84 is outstanding, which presents excellent mechanical properties even when subjected to aggressive atmospheres. The failure of structural components of aircraft occurs due to several factors that may arise from microstructural defects and/or applied static or cyclic stresses associated with atypical environments such as cryogenic or corrosive. In this sense, the results have evidenced the presence of precipitates that influence in the increase of the mechanical strength, behavior of fracture toughness, fatigue life, and corrosion fatigue, in different temperatures and aggressive means. Tensile and fracture toughness tests at 23 and À60°C the material showed ductility retention without a significant difference in the results. Fatigue crack growth in air and corrosion fatigue with 3.5 and 5% NaCl and aqueous solution with 3.5% NaCl showed a meaning difference in the threshold region; however, for the Paris region at the saline environment, fatigue crack growth (FCG) rates are similar.

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Enhancing the Microstructure and Mechanical Properties of Cast Aluminum Matrix Composites Through Nano-Al2O3 Reinforcement via CMT and PMC Welding

Işıtan,

Aytekin,

Onar

2024

Inter Metalcast

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In this investigation, two distinct composites were produced using the liquid metallurgy vortex-route method with an aluminum AA6013 matrix and 0.5% and 1% nano-Al2O3 reinforcement by weight. The effects of nano-Al2O3 ceramic particles added into the AA6013 alloy to increase the hardness and strength of the composite were investigated. Samples for welding were prepared from cast composite materials with dimensions of 250 × 110 × 60 mm. The obtained specimens were joined via butt welding at 110-A and 120-A current intensities, and at a constant speed of 400 mm/min by cold metal transfer (CMT) and pulse multi-control (PMC) welding methods. Using the use of micro- and macrostructural evaluations, hardness measurements, and tensile testing, the impacts of each welding parameter on the mechanical characteristics and weld structure of the cast composites were examined. The composite material with 0.5% nano-Al2O3 reinforcement that was joined at 120 A utilizing the CMT process achieved the highest tensile strength value at 96.6 MPa. At 110-A and 120-A welding current values, 0.5% reinforced composite demonstrated the maximum strength in both welding techniques.

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Characterization of phases, tensile properties, and fracture toughness in aircraft‐grade aluminum alloys

Cited by 12 publications

References 35 publications

The novel low cost as-casting Al-based composites with high strength and ductility

The novel low cost as-casting Al-based composites with high strength and ductility

Corrosion Fatigue of Aluminum-Copper-Lithium Alloy 2050-T84 Submitted at Salt Spray and Aqueous Saline Solution

Enhancing the Microstructure and Mechanical Properties of Cast Aluminum Matrix Composites Through Nano-Al2O3 Reinforcement via CMT and PMC Welding

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