Theoretical analysis of Basal-Pyramidal interaction of dislocations and calculation of its contribution to work hardening of magnesium crystals

Lavrentev, F. F.; Pokhil, Yu. A.; Zolotukhina, I.N.

doi:10.1016/0025-5416(76)90087-2

Cited by 21 publications

(3 citation statements)

References 8 publications

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“…This value is significantly lower than the theoretical value calculated for magnesium crystals under quasi-static strain rates for different cases of forest dislocation interaction (i.e. α = 2.5 and 1.18) [36]. The lower value of α for the present specimens implies that deformation occurs under a lower generation and accumulation rate of the dislocations within the deformed microstructure.…”

Section: Dislocation Configuration and Distributioncontrasting

confidence: 75%

Temperature-dependent variation in dynamic deformation behaviour and dislocation substructure in AZ80 magnesium

Lee

Chou

2017

Materials Science and Technology

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The dynamic deformation behaviour and dislocation substructure of AZ80 magnesium alloy are investigated at strain rates of 8 × 102, 1.5 × 103 and 2.2 × 103 s−1 and temperatures of −100, 25 and 300°C using a compressive split-Hopkinson pressure bar system. The flow stress, work hardening coefficient, strain rate sensitivity and temperature sensitivity all increase with increasing strain rate or decreasing temperature. Moreover, the dynamic deformation behaviour is well described by the Zerilli–Armstrong hexagonal close packed (hcp) constitutive equation. Catastrophic failure occurs at all three temperatures under strain rates of 1.5 × 103 and 2.2 × 103 s−1. Transmission electron microscopy observations show that the dislocation density increases with a higher strain rate or a lower temperature. Finally, the flow stress varies linearly with the square root of the dislocation density in accordance with the Bailey–Hirsch model. This paper is part of a thematic issue on Light Alloys.

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Section: Dislocation Configuration and Distributioncontrasting

confidence: 75%

Temperature-dependent variation in dynamic deformation behaviour and dislocation substructure in AZ80 magnesium

Lee

Chou

2017

Materials Science and Technology

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“…Figure 2 shows the slip lines on two perpendicular surfaces of sample II deformed to γ = 1.28 in stage B. As can be clearly seen within the limit of resolution there are no slip lines belonging to secondary slip systems, in contrast to expectations reported in [10][11][12][13]. Figure 3a presents (0001), {1210}, {1010} pole figures of sample II deformed up to γ = 1.28 in the crystal reference system.…”

Section: Methodsmentioning

confidence: 75%

“…In particular, in hcp metals the activation of secondary slip is considered in stage B. Theoretical considerations of the activation of secondary slip in hcp metals are given in [10][11][12][13]. However, in comparison to fcc metals deformed in multiple slip [15] hcp metals of the first group have not been observed to deform on secondary slip systems [14].…”

Section: Introductionmentioning

confidence: 99%

Stage B work‐hardening of magnesium single crystals

Sułkowski

Chulist

Beausir

et al. 2011

Cryst. Res. Technol.

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The change in microstructure during tensile deformation of magnesium single crystals by basal slip was studied with electron backscatter diffraction in the scanning electron microscope. Two samples were plastically deformed up to shear strains of 0.37 and 1.28 belonging to work-hardening stages A and B, respectively. The results show that the local misorientations resulting from rotations around the <1010> axis strongly increase the work-hardening coefficient in stage B. The mechanism of work-hardening in stage B is discussed with respect to subgrain formation.

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