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Microstructure of austenitic steel after the oscillatory compression test

Niewielski G., Kuc D., Rodak K.

Materials Science Poland

2007

Vol. 25, No. 1

79--84

The paper presents the influence of oscillatory torsion on the microstructure of compressed cylindrical samples of austenitic steel. The austenitic steel was deformed at room temperature using a standard compression test and oscillatory torsion test at constant parameters: the torsion angle a = š5 and torsion frequency fsk = 1.8 Hz. Samples were deformed at strains of ?= 4. Optical observations showed that well-defined slip bands and clusters of slip lines were present in the austenitic steel after two modes of deformation. Specimens deformed during the oscillatory compression test exhibit well-defined deformation twins intersected by shear bands. The structure of shear bands consists of grains between 50 nm and 400 nm in diameter. The analysis of selected diffraction pattern areas has shown that diffraction spots are arranged in rings, indicating that disorientation angles of grain boundaries are higher than 15°. Our investigations constitute a preliminary stage of complex analysis of reactions of metals under diversified process conditions.

Strengthening and the interplay of slip and twinning in copper-titanium alloys.

Radetic T., Radmilovic V., Soffa W.A.

Inżynieria Materiałowa

1999

R. XX, nr 1

32-35

TEM observations of faulted dipoles in deformed copper and copper alloys.

Niewczas M., Basinski Z.S., Basinski S.J., Embury J.D.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1244-1247

The general properties of the deformation substructure are by now well-documented in the literature, but some of the more detailed properties still remain to be studied. In the present work we examine more closely the structures known as Frank dipoles or faulted dipoles, which are recognized in electron micrographs as faint lines terminating within the crystal and running in two <110> directions in the primary glide plane but not in the primary glide direction. The presence of faulted dipoles in formed materials was reported in some of the early transmission electron microscope (TEM) investigations of the 1960s and 1970s e.g., Cu single crystals [1,2], Ni-Co single crystals [3], Ag [4], Cu-2%Al single crystals [5], and in Ge [6]. In these studies, faulted dipoles were detected only in lightly deformed material in regions of the crystal relatively free of other dislocations. The present work takes advantage of the improved resolution available with today's electron microscopic techniques to examine the occurence of faulted dipoles in copper and copper alloy single crystals deformed to various stages in tension.