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Grain size dependence of dynamic mechanical behavior of AZ31B magnesium alloy sheet under compressive shock loading

H. Asgari ; A. G. Odeshi ; J. A. Szpunar ; Lunjie Zeng (Institutionen för teknisk fysik, Eva Olsson Group ) ; Eva Olsson (Institutionen för teknisk fysik, Eva Olsson Group )
Materials Characterization (1044-5803). Vol. 106 (2015), p. 359-367.
[Artikel, refereegranskad vetenskaplig]

The effects of grain size on the dynamic deformation behavior of rolled AZ31B alloy at high strain rates were investigated. Rolled AZ31B alloy samples with grain sizes of 6,18 and 37 pm, were subjected to shock loading tests using Split Hopkinson Pressure Bar at room temperature and at a strain rate of 1100 s(-1) It was found that a double-peak basal texture formed in the shock loaded samples. The strength and ductility of the alloy under the high strain-rate compressive loading increased with decreasing grain size. However, twinning fraction and strain hardening rate were found to decrease with decreasing grain size. In addition, orientation imaging microscopy showed a higher contribution of double and contraction twins in the deformation process of the coarse-grained samples. Using transmission electron microscopy, pyramidal dislocations were detected in the shock loaded sample, proving the activation of pyramidal slip system under dynamic impact loading.

Nyckelord: AZ31B magnesium alloy, Dynamic deformation mechanism, Twinning, Mechanical properties



Denna post skapades 2015-09-18.
CPL Pubid: 222736

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Eva Olsson Group (2012-2015)

Ämnesområden

Metallurgi och metalliska material
Teknisk fysik

Chalmers infrastruktur