Tension-compression asymmetry and the underlying slip/twinning activity in extruded Mg–Y sheets

Yin, Dongdi; Boehlert, C. J.; Long, Lianchun; Huang, Gang; Zhou, Hao; Zheng, Jiang; Wang, Q.D.

doi:10.1016/j.ijplas.2020.102878

Cited by 176 publications

(21 citation statements)

References 71 publications

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“…Wrought Mg alloys usually present a strong basal texture along the rolling/extrusion direction, which facilitates the activation of twinning during compression in this orientation, while activation of basal slip is hindered because basal planes are parallel to the extrusion axis. As a result, a strong tension-compression asymmetry in the cyclic stressstrain curves appears due to the significant differences in the critical resolved shear stresses necessary to activate pyramidal slip (dominant during the tensile part of the cycle) and tensile twinning (which controls plastic strain in compression) [7,14,16,19,[22][23][24][25][26][27][28][29][30]. This asymmetry increases with the applied strain amplitude due to the substantial hardening associated with pyramidal slip [16,28,29,[31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Quantitative assessment of the microstructural factors controlling the fatigue crack initiation mechanisms in AZ31 Mg alloy

Jamali

LLorca

2022

Acta Materialia

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Section: Introductionmentioning

confidence: 99%

Quantitative assessment of the microstructural factors controlling the fatigue crack initiation mechanisms in AZ31 Mg alloy

Jamali

LLorca

2022

Acta Materialia

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“…As shown in Figure 8 c, the corrugated grains cannot be analyzed completely, which is due to a large number of dislocations that lead to excessive residual stress. The green arrow represents the slip plane trace [ 27 ]. Figure 11 b shows the slip system of the tensile twin T, and the purple arrow indicates the slip direction.…”

Section: Resultsmentioning

confidence: 99%

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

et al. 2021

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The conventional rolling of magnesium alloy with a single pass and large reduction will cause severe edge cracking. The sheet without cracks can be achieved by limited width rolling. The microstructure evolution of the sheet with cracks after conventional rolling and the sheet without cracks after limited width rolling is explored, and an effective mechanism for solving edge cracks is proposed. Conventional rolling can fully develop twin evolution due to high deformation, and three stages of twinning evolution can be observed and the secondary twins easily become the nucleation points of micro cracks, resulting in a large number of cracks propagating along the twin lamellae. Cracks terminate at dislocation accumulation because the accumulation of a large number of dislocations can hinder propagation. Dislocation shearing of twins to eliminate the high localization caused by twins and induce the tensile twins to weaken the basal surface texture provides an effective plastic deformation mechanism of crack inhibition, which is useful for expanding the engineering application of magnesium alloy rolled sheets.

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“…As the lightest structural metal in industrial applications, magnesium alloys have been intensively investigated due to their contributions in energy conservation and environment protection [1][2][3][4]. Owing to their hexagonal close-packed (HCP) lattice structure, the easy slip systems in Mg alloys are insufficient to support the stable plastic deformation at room temperature [5][6][7][8][9][10]. It is well established that the factor of Hall-Petch equation of Mg alloys is high, while the strengthening is difficult to achieve by work hardening, because of the low ductility [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure Evolution of Mg-Gd Alloy during Aging Treatment

Liu

Song

et al. 2021

Metals

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Rare-earth-containing Mg alloys are a group of widely investigated alloys due to the disperse nano-sized precipitations formed during heat treatment. The underlying formation and strengthening mechanisms of precipitation is critical for their industrial applications. In this work, we systematically studied the evolution of precipitations in a Mg-10Gd alloy, based on the atomic-scaled TEM and HAADF-STEM observations. Especially, the in-depth transition mechanism from G.P. Zone to β”, β’, βT and βM is proposed, as well as their relationships with mechanical properties. It is found that blocking effect of precipitations improves the strength significantly, according to the Orowan mechanism. The elliptic cylinder shaped β’ phase, with a base-centered orthorhombic lattice structure, provides significant strengthening effects, which enhance the hardness and ultimate tensile strength from 72 HV and 170 MPa to 120 HV and 300 MPa.

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Tension-compression asymmetry and the underlying slip/twinning activity in extruded Mg–Y sheets

Cited by 176 publications

References 71 publications

Quantitative assessment of the microstructural factors controlling the fatigue crack initiation mechanisms in AZ31 Mg alloy

Quantitative assessment of the microstructural factors controlling the fatigue crack initiation mechanisms in AZ31 Mg alloy

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

Mechanical Properties and Microstructure Evolution of Mg-Gd Alloy during Aging Treatment

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