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.

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

Fingerprint

Magnesium alloys
Equal channel angular pressing
Microstructure
Twinning
Tensile testing
Ductility
Plastic deformation
Temperature
Scanning electron microscopy
Testing

Keywords

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

Cite this

Gzyl, M. Z., Rosochowski, A., Pesci, R., & Olejnik, L. (2014). Microstructure evolution in AZ31B magnesium alloy subjected to tension. 6th International Conference on Nanomaterials by Severe Plastic Deformation, Metz, France.
Gzyl, Michal Zbigniew ; Rosochowski, Andrzej ; Pesci, Raphael ; Olejnik, Lech. / Microstructure evolution in AZ31B magnesium alloy subjected to tension. 6th International Conference on Nanomaterials by Severe Plastic Deformation, Metz, France.
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Gzyl, MZ, Rosochowski, A, Pesci, R & Olejnik, L 2014, 'Microstructure evolution in AZ31B magnesium alloy subjected to tension' 6th International Conference on Nanomaterials by Severe Plastic Deformation, Metz, France, 30/06/14 - 4/07/14, .

Microstructure evolution in AZ31B magnesium alloy subjected to tension. / Gzyl, Michal Zbigniew; Rosochowski, Andrzej; Pesci, Raphael; Olejnik, Lech.

2014. 6th International Conference on Nanomaterials by Severe Plastic Deformation, Metz, France.

Research output: Contribution to conferenceSpeech

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T1 - Microstructure evolution in AZ31B magnesium alloy subjected to tension

AU - Gzyl, Michal Zbigniew

AU - Rosochowski, Andrzej

AU - Pesci, Raphael

AU - Olejnik, Lech

PY - 2014/8

Y1 - 2014/8

N2 - 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.

AB - 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.

KW - ECAP

KW - magnesium alloy

KW - UFG metals

KW - in situ SEM

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Gzyl MZ, Rosochowski A, Pesci R, Olejnik L. Microstructure evolution in AZ31B magnesium alloy subjected to tension. 2014. 6th International Conference on Nanomaterials by Severe Plastic Deformation, Metz, France.