Details

Autor(en) / Beteiligte

• Millán, L.
• Bokuchava, G.
• Fernández, R.
• Papushkin, I.
• González-Doncel, G.

Titel

Further insights on the stress equilibrium method to investigate macroscopic residual stress fields: Case of aluminum alloys cylinders

Ist Teil von

• Journal of alloys and compounds, 2021-04, Vol.861, p.158506, Article 158506

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Macro residual stresses after fast and slow cooling Al alloys are studied from neutron and synchrotron radiation diffraction.•The stress equilibrium method and the “composite model” or the Rietveld method are used in the calculations of the M-RS.•Texture gradient is not a relevant factor affecting the M-RS profile developed with quenching.•The different M-RS from the individual peak and Rietveld analysis of the slow cooled sample are associated with a m-RS.•A comprehensive understanding of the RS state in polycrystalline materials requires a multi-scale analysis of the M- and m-RS. The stress equilibrium, SE, method has been shown to be a very powerful, reliable tool for calculating the un-stressed lattice parameter, a0, as a critical requirement for the determination of the residual stress, RS, by diffraction techniques. The method can be used in cases where others, such as the powder or comb ones, are limited (e.g., in age-hardenable aluminum alloys components, where a0 can be affected). Owing to its potential, this method can address complex cases that, however, have not yet been sufficiently exploited. In particular, it makes it possible to delve into the effect of microstructural factors (e.g., texture variations) on the macroscopic residual stress, M-RS. Here, the M-RS obtained after quenching and slow cooling of cylindrical samples of aluminum alloys has been investigated. Data obtained from neutron and synchrotron radiation diffraction in AA5083 and AA2014 alloy samples (of different size), respectively, have been used. Specifically, the development of a texture gradient, a very common consequence derived from conventional manufacturing processes of components, has been taken into account. The known fact that a parabolic profile of the M-RS is obtained in cylindrical samples is used to generalize the SE method to determine a0 and to strengthen its quality and reliability.