Work Hardening of Magnesium Single Crystals Deformed to Stage~B at Room Temperature

• Authors: B. Sułkowski , B. Mikułowski
• Languages of publication: EN

Abstracts

EN

Magnesium single crystals of purity (99.8 wt%) deformed to stage B on the work-hardening curve at the temperature of 293 K and at a strain rate of 10^{-3} s^{-1} were investigated. The modified Bridgman method was used to obtain the crystals of the preferred orientation of (0001)〈11\overline{2}0〉 as primary slip system. By using the method based on the experimental gradient matrix, the activity of slip systems was obtained in magnesium single crystals deformed to shear strain 1.2 γ, where well developed stage B of work hardening was observed. It was shown that primary (0001)〈11\overline{2}0〉 slip system was dominant in the whole investigated range of the examined deformation. The observation and analysis of etch pits on the {\overline{1}2\overline{1}0} plane showed the heterogeneous distribution of dislocations formed during deformation into walls of dislocations perpendicular to the (0001) slip plane. The suggested model of work hardening of magnesium single crystals, which is worth taking into consideration, shows the influence of the long-range stress field derivating from the groups of dislocations arranged in dislocation walls.

Keywords

EN

81.40.Ef; 61.72.Ff; 61.72.Hh; 61.72.Lk

Discipline

• 81.40.Ef: Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
• 61.72.Lk: Linear defects: dislocations, disclinations
• 61.72.Ff: Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
• 61.72.Hh: Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.)

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 3
• Pages: 528-531

Dates

published

2012-09

Contributors

author

B. Sułkowski

• AGH University of Science and Technology, Department of Metallic Materials and Nano-Engineering Faculty of Non-Ferrous Metals, al. A. Mickiewicza 30, 30-059 Cracow, Poland

author

B. Mikułowski

• AGH University of Science and Technology, Department of Metallic Materials and Nano-Engineering Faculty of Non-Ferrous Metals, al. A. Mickiewicza 30, 30-059 Cracow, Poland

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Identifiers

DOI

10.12693/APhysPolA.122.528