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Analysis of AZ91 alloy deformed at high velocities

100%

Man O. , Forejt M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2007

tom 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.

Vývoj mikrostruktury slitiny AZ31 při deformaci vysokou rychlostí

80%

Man O. , Šlais M. , Forejt M. , Podrábský T.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2008

tom z. 92

75-76

Degradace struktury lopatky plynové turbiny ze slitiny ŽS6K vlivem provozu

61%

Podrabsky T. , Hakl J. , Němec K. , Belan J. , Vlasak T. , Man O.

Archiwum Odlewnictwa

2004

tom R. 4, nr 11/2

117--122

Po ukončeni provozu oběžných lopatek plynove turbiny z lité superslitiny ŽS6K byly sledovany změny ve struktuře. Degradace struktury byla sledovana pomoci svetelné a elektsonové mikroskopie. Nežádouci faze &sigma vyskytující se v matrici slitiny byla zjištěna EDS a EBDS analýzou.

Blades made of cast Ni base superalloy ZHS6K after service in gas turbine were analyzed with the aim to characterize changes in structure. Structure degradation was analysed by light and electron microscopy. Harmful phase a was detected in matrix by EDS and ESBD analysis.