Aluminium Alloys for Aerospace Applications

Rambabu, P.; Prasad, N. Eswara; Kutumbarao, V.V.; Wanhill, R.J.H.

doi:10.1007/978-981-10-2134-3_2

Cited by 213 publications

(103 citation statements)

References 4 publications

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“…The synergistic portfolio of engineering properties such as low density, high specific strength, and ability to respond to a variety of heat treatment cycles to provide a window of mechanical properties coupled with adaptability to diverse manufacturing routes have been utilized in light weighting of vehicles in automotive and aerospace sectors . Mostly, the Al alloys in these industry segments are being used as a structural member that generally demand excellent corrosion and wear protection.…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon has been demonstrated on 6061‐T6 Al alloy wherein the fatigue life enhancement of prior shot peened MAO coating was shown to be about an order of magnitude (10 times) than the corresponding bare substrate . However, whether or not the above phenomenon holds good in the case of more widely used high strength aerospace Al alloys such as 2024‐T3 and 7075‐T6 (used for a variety of aerospace applications such as fuselage and pressure cabins, wings, wing skins, horizontal and vertical stabilizers, cowls, and airframe structures that are exposed to cyclical mechanical loads) needs to be investigated in greater detail such that the use of these surface modified materials for fatigue‐prone aerospace applications can readily be visualized …”

Section: Introductionmentioning

confidence: 99%

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Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Krishna

Madhavi

Sahithi

et al. 2018

Fatigue Fract Eng Mat Struct

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Hard anodized (HA) and micro arc oxidation (MAO) coatings of identical thickness were deposited on two different high strength aluminum (Al) alloys namely, 2024‐T3 and 7075‐T6. Further, as received Al alloys were also subjected to shot peening (SP) to induce subsurface compressive residual stresses followed by the MAO coating deposition (SP + MAO). The average velocity of particle‐in‐flight during the SP process was measured and utilized to calculate the kinetic energy of the peening particles. The bare and coated alloys were subjected to completely reversed stress (R = −1) rotating beam high cycle fatigue tests at five different stress levels. In addition, the bare and coated alloys were also evaluated for their tensile properties, elemental composition, phase constituents, surface, and cross‐sectional morphologies including the surface roughness (Ra, Rz) and correlated the same with the corresponding fatigue behavior. Irrespective of substrate alloy composition and stress levels investigated, the duplex SP + MAO treatment resulted in significant fatigue life enhancement over and above the fatigue life of corresponding bare (not shot peened) Al alloy, while the hard anodized and plain MAO (both without prior shot peening) continue to exhibit significant fatigue debit. Driven by the compressive residual stresses present beneath the subsurface region of SP + MAO coating interface, fractured surface examination of SP + MAO coatings clearly highlights the crack‐branching associated multiple crack deflection as the predominant operative mechanism responsible for diminishing the crack growth rate and therefore enhance the fatigue life as compared with the near linear crack extension without significant deflections leading to relative premature failure of plain MAO coated alloys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Krishna

Madhavi

Sahithi

et al. 2018

Fatigue Fract Eng Mat Struct

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“…FSW of aluminum [5][6][7] and magnesium [6] alloys has a great potential of application in the aerospace and automotive industries [7].…”

Section: Mechanical and Fatigue Strength Assessment Of Friction Stir mentioning

confidence: 99%

“…These variables influence the geometry and penetration of the weld, which influence the mechanical properties of the different zones of the welded joint [5,6]. In previous studies, Franco [8] used a milling machine to perform FSW sheet Mg alloy AZ31B, achieving a mechanical efficiency of 93%, and a reduction of grain size up to 85% in the SZ.…”

Section: Mechanical and Fatigue Strength Assessment Of Friction Stir mentioning

confidence: 99%

Mechanical and Fatigue Strength Assessment of Friction Stir Welded Plates of Magnesium Alloy AZ31B

et al. 2018

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Light-alloys play a significant role in saving weight in automotive and aerospace industries; however, a few joining methods guarantee mechanical and fatigue strengths for high performance application. Even conventional arc welding processes do not offer constant quality joints. Therefore, this study uses an alternative solid-state welding process, friction stir welding (FSW), to analyze post processing microstructures and assess mechanical and fatigue strength. Magnesium alloy AZ31B plates were welded using different welding parameters in a dedicated FSW machine. The effect of the spindle speed (ω) and welding speed (ν) on the microstructure, the tensile strength and fatigue were studied. The stirred zone (SZ) at the FS-welded joints presented a microstructure composed by homogeneous equiaxial grains, refined by dynamic recrystallization. A rise in grain size, weld bead width, tensile and fatigue strengths with the increase of speed ratio (ω/ν) were observed. Results of the fatigue and mechanical strength here presented outperformed results from welds made with conventional milling machines. Key-words: Avaliação da Resistência Mecânica e à Fadiga de Chapas Soldadas por Atrito com Pino não Consumível da Liga de Magnésio AZ31BResumo: Ligas leves apresentam uma importante função na indústria, na redução de peso na indústria automotiva e aeroespacial. No entanto, poucos métodos de união garantem a resistência mecânica e de fadiga necessárias para aplicações de alto desempenho. Inclusive, processos convencionais de soldagem a arco, nem sempre fornecem juntas soldadas de qualidade. Portanto, este estudo usa um processo de soldagem alternativo em estado sólido, conhecido por soldagem por atrito com pino não consumível (SAPNC). São analisadas as microestruturas após soldagem, a resistência mecânica e de fadiga. Chapas de magnésio da liga AZ31B foram soldadas com diferentes parâmetros em uma máquina dedicada para SAPNC. Foram estudados os efeitos da velocidade de soldagem (ν), velocidade de rotação (ω) na microestrutura, resistência mecânica e de fadiga. A zona misturada (ZM) das juntas por SAPNC mostrou microestruturas compostas por grãos homogêneos e equiaxiais, refinados por recristalização dinâmica. Foi observado um aumento do tamanho de grão, largura do cordão, resistência mecânica e de fadiga com o aumento da relação de velocidade (ω/ν). Os resultados da resistência mecânica e fadiga apresentados ultrapassaram resultados de juntas similares realizadas em máquinas fresadoras convencionais.Palavras-chave: Magnésio AZ31B; Resistência à fadiga; Resistência mecânica; Soldagem por atrito com pino não consumível; SAPNC.

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“…The anticipated properties in these materials are obtained through modification and new design processes by materials engineers [2]. Low ultimate tensile strength, low hardness, poor corrosion property and ductility are some of the drawbacks of ASTMA 29 steel [5]. Even though it has availability and low-cost advantage [6].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical performance and microstructural evolution of laser deposited Al‐Sn coating in acidic environment

Fatoba

Akinlabi

2019

Materialwissenschaft Werkst

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Outstanding performance of materials is one of the requirements of modifying the existing materials in order to meet a global demand necessary in technology innovation. Direct laser metal deposition technique due to excellent properties has replaced conventional techniques in modifying the surface of materials. The interplay between melting, fusion and optimised laser parameters are very important factors to be considered when using laser metal deposition technique. ASTM A29 steel property was enhanced through this technique by Al‐Sn reinforcements. A 3‐kW continuous wave ytterbium laser system was employed by this process. This research investigated the microstructure and corrosion properties of fabricated laser metal deposited ASTM A29 steel. The resulting microstructure and content of the inconsequential elements in the coatings fabricated were studied to obtain the results achieved. Observation of the microstructure showed typical phase of acicular α′‐martensite attributed to rapid cooling of the molten pool. The electrochemical behaviour was investigated in 1 M HCl solution at 27 °C via potentiodynamic polarization technique. The fabricated coatings had corrosion rate of 0.03435 mm/yr, current density of 3.95 ⋅ 10−6 A/cm2, and polarization resistance of 7093.4 Ω ⋅ cm2. While the control had corrosion rate of 16.308 mm/yr and polarization resistance of 8.0631 Ω ⋅ cm2.

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Aluminium Alloys for Aerospace Applications

Cited by 213 publications

References 4 publications

Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Mechanical and Fatigue Strength Assessment of Friction Stir Welded Plates of Magnesium Alloy AZ31B

Electrochemical performance and microstructural evolution of laser deposited Al‐Sn coating in acidic environment

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