Microstructure evolution in AZ31B magnesium alloy subjected to tension

Michal Zbigniew Gzyl, Andrzej Rosochowski, Raphael Pesci, Lech Olejnik

Research output: Contribution to conferenceSpeech

Abstract

Incremental Equal Channel Angular Pressing (I-ECAP) is an incremental severe plastic deformation (SPD) process, which can be used to process continuous bars, plates and sheets. In the current study, commercially available AZ31B magnesium alloy bars were subjected to four passes of I-ECAP using route BC; the process was conducted at 250 °C since fracture was reported at lower temperatures. The obtained fine-grained bars were subjected to side upsetting at 200 °C to produce sheets. The significant height reduction, from 10 mm to 2 mm, was obtained without fracture. Then, flat tensile samples were machined from as-received coarse-grained bars and fine-grained, strongly textured sheets. The samples were polished and etched to enable observation of microstructure evolution during testing. Tensile testing was conducted in the SEM chamber at room temperature with constant tool velocity. It was shown that earlier fracture of coarse-grained samples, comparing to fine-grained ones, can be attributed to twinning as twin-size voids were observed in the fracture zone. Avoidance of twinning was identified as the most important factor for ductility enhancement of fine-grained and strongly textured sheets.
Original languageEnglish
Publication statusUnpublished - Aug 2014
Event6th International Conference on Nanomaterials by Severe Plastic Deformation - The Arsenal , Metz, France
Duration: 30 Jun 20144 Jul 2014
http://www.nanospd6.com/

Conference

Conference6th International Conference on Nanomaterials by Severe Plastic Deformation
Abbreviated titleNanoSPD6
CountryFrance
CityMetz
Period30/06/144/07/14
OtherThis conference is part of a series of conferences taking place every third year; the history of NanoSPD conferences began in 1999 in Moscow, followed by Vienna in 2002, Fukuoka in 2005, Goslar in 2008 and Nanjing in 2011.
Internet address

Keywords

  • ECAP
  • magnesium alloy
  • UFG metals
  • in situ SEM

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