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1 Zeszyty Naukowe. Mechanika / Politechnika Opolska

1 2007

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Analysis of AZ91 alloy deformed at high velocities

Man O., Forejt M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2007

Vol. 321, z. 89

31-31

The deformation of pure polycrystalline metals has been studied very extensively so far even in case of high strains and high deformation rates. However, only a few papers were presented about the deformation behavior of common commercial light-weight magnesium alloys under high deformation velocity (for instance [1]) but none has emphasized the effect of such extreme loading conditions on the microstructure and sub-microstructure. In this paper, there are presented some outcomes of metallographic and electronmicroscopic studies of samples of magnesium alloy AZ 91 deformed at high strain rates. The samples were made in two shape variants: one for “Split Hopkinson Pressure Bar” (SHPB) deformation test [2] and the second one for “Taylor Anvil Test” (TAT). The impact velocities were 14,36 m.s-1, 26,81 m.s-1 and 30,58 m.s-1 for SHPB test and 105,71 m.s-1 and 122,49 m.s-1 for TAT. No specimen exhibited disintegration during the test. Corresponding overall longitudinal plastic deformation of Hopkinson test specimens were 4,6%, 14,5% and 13,8% respectively. Taylor test specimens were evaluated only qualitatively. Analytical methods used were: 1. light microscopy of metallographic specimens – longitudinal sections of the test pieces; 2. scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) on the same specimens as above. Light microscopy analyses indicated growing amount of cracking at the interface of Al12Mg17 phase and the matrix with increasing impact velocity at HSPB test specimens. Results of SEM and EBSD analyses are beyond the extent of this abstract.