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Direct observation of the dynamic evolution of precipitates in aluminium alloy 7021 at high strain rates via high energy synchrotron X-rays

DOI: 10.1016/j.actamat.2020.116532 DOI Help

Authors: W. U. Mirihanage (University of Manchester) , J. D. Robson (University of Manchester) , S. Mishra (University of Manchester) , P. Hidalgo-manrique (University of Manchester) , J. Quinta Da Fonseca (University of Manchester) , C. S. Daniel (University of Manchester) , P. B. Prangnell (University of Manchester) , S. Michalik (Diamond Light Source) , O. V. Magdysyuk (Max Planck Institute for Solid State Research, Stuttgart) , T. Connolley (Diamond Light Source) , M. Drakopoulos (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 13828

Open Access Open Access

Abstract: An improved understanding of the phenomenon of dynamic precipitation is important to accurately model and simulate many industrial manufacturing processes with high strength Al-alloys. Dynamic ageing in 7xxx Al-alloys can occur as a result of both the strain and heat. Small angle X-ray scattering (SAXS) is an advanced technique that allows the precipitation processes to be studied in situ, but to date this has only been possible at lower than industrially relevant strain rates (e.g. < 10−3). In this contribution, we demonstrate the potential of in-situ SAXS studies of metallic alloys at higher strain rates (10−2) than previously, using a high energy synchrotron X-ray. The time resolved SAXS information has been used to evaluate dynamic precipitate evolution models and has demonstrated that at high strain rates a new regime must be considered which includes the more significant effect of vacancy annihilation, leading to a clear strain rate, rather than just strain, kinetic dependence.

Subject Areas: Materials, Engineering


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Documents:
1-s2.0-S1359645420309691-main.pdf