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Modelling and simulation of dynamic recrystallization (DRX) in OFHC copper at very high strain rates

Gabriel Testa ; Nicola Bonora ; Andrew Ruggiero ; Gianluca Iannitti ; I. Persechino ; Magnus Hörnqvist (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Seyedeh Nooshin Mortazavi (Institutionen för teknisk fysik, Materialens mikrostruktur )
19th Biennial APS Conference on Shock Compression of Condensed Matter (0094-243X). p. Article number 100034. (2017)
[Konferensbidrag, refereegranskat]

At high strain rates, deformation processes are essentially adiabatic and if the plastic work is large enough dynamic recrystallization can occur. In this work, an examination on microstructure evolution of OFHC copper in Dynamic Tensile Extrusion (DTE) test, performed at 400 m/s, was carried out. EBSD investigations, along the center line of the fragment remaining in the extrusion die, showed a progressive elongation of the grains, and an accompanying development of a strong < 001 > + < 111 > dual fiber texture. Discontinuous dynamic recrystallization (DRX) occurred at larger strains, and it was showed that nucleation occurred during straining. A criterion for DRX to occur, based on the evolution of Zener-Hollomon parameter during the dynamic deformation process, is proposed. Finally, DTE test was simulated using the modified Rusinek-Klepaczko constitutive model incorporating a model for the prediction of DRX initiation.



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Denna post skapades 2016-01-26. Senast ändrad 2017-10-06.
CPL Pubid: 231317

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Materialvetenskap
Maskinteknik
Övrig teknisk materialvetenskap

Chalmers infrastruktur