A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Room temperature recovery of cryogenically deformed aluminium alloys
Increased formability of aluminium alloys has been demonstrated via cryogenic deformation. In previous studies, the microstructures of samples deformed at low temperatures were analysed after reheating to room temperature (RT) and storage. However, after heating the dislocation structure and density of the deformed material do not reflect the cryogenic situation. In this work, we investigate the evolution of flow stress during recovery in Al-Mg and Al-Mg-Si alloys. We examine the RT recovery behaviour of samples pre-strained at 77 K to different strain levels, and evaluate the structural stability upon subsequent deformation. We also study microstructural evolution via in-situ synchrotron X-ray diffraction, starting from initial conditions at cryogenic temperatures to long-term RT-recovery. Recovery of cryogenically deformed samples at RT results in reduction of the flow stress, in dependence on RT storage. The recovery process can be divided into three distinct sections, each based on a different mechanism characterized by either the arranging or the annihilation of dislocations. Subsequent further straining at room temperature after cryogenic forming also generates plastic instabilities and premature fracture due to unfavourable hardening and recovery assisted softening interplay.
Room temperature recovery of cryogenically deformed aluminium alloys
Increased formability of aluminium alloys has been demonstrated via cryogenic deformation. In previous studies, the microstructures of samples deformed at low temperatures were analysed after reheating to room temperature (RT) and storage. However, after heating the dislocation structure and density of the deformed material do not reflect the cryogenic situation. In this work, we investigate the evolution of flow stress during recovery in Al-Mg and Al-Mg-Si alloys. We examine the RT recovery behaviour of samples pre-strained at 77 K to different strain levels, and evaluate the structural stability upon subsequent deformation. We also study microstructural evolution via in-situ synchrotron X-ray diffraction, starting from initial conditions at cryogenic temperatures to long-term RT-recovery. Recovery of cryogenically deformed samples at RT results in reduction of the flow stress, in dependence on RT storage. The recovery process can be divided into three distinct sections, each based on a different mechanism characterized by either the arranging or the annihilation of dislocations. Subsequent further straining at room temperature after cryogenic forming also generates plastic instabilities and premature fracture due to unfavourable hardening and recovery assisted softening interplay.
Room temperature recovery of cryogenically deformed aluminium alloys
Gruber, Belinda (author) / Grabner, Florian (author) / Falkinger, Georg (author) / Schoekel, Alexander (author) / Spieckermann, Florian (author) / Uggowitzer, Peter J. (author) / Pogatscher, Stefan (author)
2020-01-01
108819 pages
Materials and design 193, 108819 (2020). doi:10.1016/j.matdes.2020.108819
Miscellaneous
Electronic Resource
English
Nanomechanical Behaviour of Martensite in Cryogenically Deformed NiTi Alloy
| Springer Verlag | 2019
On the room-temperature annealing of cryogenically rolled copper
| British Library Online Contents | 2011
Enhanced shape recovery in cryogenically treated martensitic Ti–Ni alloys
| British Library Online Contents | 2013
Microstructure Prediction of Hot-Deformed Aluminium Alloys
| British Library Online Contents | 2008