Natural aging on Al-Cu-Mg structural hardening alloys – Investigation of two historical duralumins for aeronautics

Abstract

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Effect of actual and accelerated ageing on microstructure evolution and mechanical properties of a 2024-T351 aluminium alloy

“…Taking into account the differences in chemical composition between the pristine material and the wing panels, it was assumed that the hardness values measured for the wing panels, independent of the location of the samples (near or far from the engines), correspond with an ageing lower than a 55h exposure at 150°C, in agreement with the TEM observations. The results are consistent with literature data [4,18,19] Figure 7 presents the residual tensile properties measured for pristine material after artificial ageing at 150 °C. Maximum stress, yield stress and elongation to failure were considered as the main parameters characteristic of the microstructural evolutions.…”

Study of Post-World War II French Aeronautical Aluminium Alloy and Coatings: Historical and Materials Science Approach

“…Full report of metallographic structures for L2 ( Figure 2a) and L8 ( Figure 2b) can be found in previous publication (A. Cochard et al 2017). Here, only one orientation (normal plane) is shown and commented.…”

“…Compared with our previous results in articles (A. Cochard et al 2013;2017) where inductively coupled plasma optical emission spectroscopy (OES) and wavelength dispersive X-ray spectroscopy (WDS) were used to determine alloys elemental composition, we favoured here SEM-EDS which is accurate enough for differentiating alloys grades. For each alloy, EDS acquisition was performed on four areas of 500x500 µm² with a minimum of 100 000 counts on each spectrum.…”

“…Cochard et al 2013) and one comparing two aluminium alloys (A. 2017). Here, the methodology is extended to different parts collected on strategic areas of the aircraft: on the primary and secondary structures, exposed either inside or outside, on which a precise investigation is carried out covering the analysis of aluminium alloys but also the protective coatings, which haven't been reported before.…”

Multistage artificial aging optimization for tensile properties of Duralium using Response Surface Method (RSM)

“…The tensile strength decreased from 36.80 kgf/mm 2 to 32.60 kgf/mm 2 in over heating condition (220ºC for 8 hours). This is due to the aging at the higher temperature (over than 200ºC) leaded to softening process [14].…”