Al-Li Alloys – The Analysis of Material Behaviour during Industrial Hot Forging

Bylja, Olga; Gomez-Gallegos, Ares; Stefani, Nicola; Blackwell, Paul

doi:10.1016/j.proeng.2017.10.729

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…A. Antunes [42] reported that the fatigue limit and yield strength of metallic alloys are directly correlated. The difficulty of obtaining these data lie on the fact that the alloy microstructures and its thermomechanical processing history can lead to different fatigue behaviours for the same particular alloy [43]. Moreover, the fatigue limit is also affected by the type of crack initiation.…”

Section: Fatiguementioning

confidence: 99%

“…For AA2099 alloy to replace Ti-64 in aircraft structures, its mechanical behaviour and damage tolerance capabilities should be equal or superior to those of Ti-64. Using the yield strength approach, Ti-64 with a yield strength 400 MPa above AA2099 could be considered to have a higher fatigue resistance, however this cannot be investigated in this work as the total processing history for both alloys needs to be known [43].…”

Section: Fatiguementioning

confidence: 99%

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Substituting Ti-64 with Aa2099 as Material of a Commercial Aircraft Pylon

Khalid

Gomez-Gallegos

2021

Advances in Materials Science

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The aircraft industry is striving to reduce the weight of aircraft to save fuel and hence reduce total cost. New alloys and composites with properties such as low weight and high strength are continuously developed. Titanium alloys have the best strength-to-weight ratio among metals which makes them very suitable for aircraft applications. Ti-64 is the most common Titanium alloy used in aircraft. AA2099 is a 3rd generation Al-Li alloy and has the lowest density among all Aluminium alloys making it very attractive for aircraft applications. Pylons of commercial aircraft are currently made primarily with Ti-64 and this study focused on the replacement of Ti-64 with AA2099. Loading conditions, operating temperature, corrosion resistance, manufacturability and recyclability of the pylon were analysed of both Ti-64 and AA2099. Three critical scenarios were chosen for the loading conditions of the pylon. These were simulated using finite element analysis first using Ti-64 and then AA2099. From the results, it is evident that using AA2099 as the material of the pylon instead of Ti-64 offered weight savings. The operating temperature, manufacturability and recyclability also showed advantages when using AA2099 whereas corrosion factors favoured Ti-64, since AA2099 was found to be very prone to galvanic corrosion.

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Section: Fatiguementioning

confidence: 99%

Section: Fatiguementioning

confidence: 99%

Substituting Ti-64 with Aa2099 as Material of a Commercial Aircraft Pylon

Khalid

Gomez-Gallegos

2021

Advances in Materials Science

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“…Processing maps [13,14] were the first set of attempts to relate the material science approach to that of the process engineering approach. The limitations in using processing maps for FIFP are discussed in detail elsewhere [15]. Nevertheless, all these attempts involve models developed based on the very limited data obtained from uniaxial tests.…”

Section: ) Materials Science Approachmentioning

confidence: 99%

Aspects of High Strain Rate Industrial Forging of Inconel 718

et al. 2020

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The major part of all material and microstructural data used for the modelling of nickel superalloy forgings are obtained from uniaxial laboratory tests with limited plastic strain and very simple thermo-mechanical history. At the same time, new challenges in near-net shape industrial forging require a high level of reliability of modelling prediction of metal flow, for predicting the risk of defects and microstructural transformation. A few recently conducted benchmarking studies have shown that despite the availability of various material models (including microstructural ones) embedded in commercial FE software, in many cases, the level of prediction remains unsatisfactory. This is especially true for Fast Industrial Forging Processes (like screw press or hammer forgings). This paper suggests a methodology for processing the results from industrial forgings for obtaining robust data for calibration, validation and improvement of material and microstructural models. This also can provide additional information on the material science behind the microstructural phenomena, which are problematic to capture and study using simple uniaxial tests.

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Influences of impact energy on the densification and mechanical properties of powder metallurgical Fe–C–Cu preforms during a powder-forged process

Guo

et al. 2020

Journal of Materials Research and Technology

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Al-Li Alloys – The Analysis of Material Behaviour during Industrial Hot Forging

Cited by 3 publications

References 5 publications

Substituting Ti-64 with Aa2099 as Material of a Commercial Aircraft Pylon

Substituting Ti-64 with Aa2099 as Material of a Commercial Aircraft Pylon

Aspects of High Strain Rate Industrial Forging of Inconel 718

Influences of impact energy on the densification and mechanical properties of powder metallurgical Fe–C–Cu preforms during a powder-forged process

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