Flow Instabilities During Hot Deformation of Titanium Alloys and Titanium Matrix Composites

Poletti, María Cecilia; Halici, Dilek; Xue, Songbai

doi:10.1002/9781119296126.ch34

Cited by 1 publication

(1 citation statement)

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“…Phenomenological models consist in setting up a constitutive equation linking the flow stress to the strain, the strain rate, and the temperature, and optimising it so that it best represents the main features of the flow curves. The equation usually features a power law dependency for the strain and the strain rate, and an activation energy for the thermal dependency [ 1 , 2 , 3 , 4 ]. Such models present the advantages of being easy to set up and requiring almost no computational power, but they do not provide any insight on the physics of the problem at hand.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution in a 6082 Aluminium Alloy during Thermomechanical Treatment

et al. 2018

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Thermomechanical treatments of age-hardenable wrought aluminium alloys provoke microstructural changes that involve the movement, arrangement, and annihilation of dislocations, the movement of boundaries, and the formation or dissolution of phases. Cold and hot compression tests are carried out using a Gleeble® 3800 machine to produce flow data as well as deformed samples for metallography. Electron backscattered diffraction and light optical microscopy were used to characterise the microstructure after plastic deformation and heat treatments. Models based on dislocation densities are developed to describe strain hardening, dynamic recovery, and static recrystallisation. The models can describe both the flow and the microstructure evolutions at deformations from room temperatures to 450 °C. The static recrystallisation and static recovery phenomena are modelled as a continuation of the deformation model. The recrystallisation model accounts also for the effect of the intermetallic particles in the movements of boundaries.

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Section: Introductionmentioning

confidence: 99%