Twinning induced spatial stress gradients: Local versus global stress states in hexagonal close-packed materials

Fidder, Herman; Basu, Indranil; Hosson, J.Th.M. De

doi:10.1016/j.actamat.2023.119142

Cited by 7 publications

(1 citation statement)

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“…The lamella connecting two adjacent grains is termed "paired twins", while the lamella connecting three or more neighboring grains is referred to as twin chains. The accurate prediction of the activated twin variant in deformed Mg alloy using only the SF can be quite challenging [36,37]. Thus, strain compatibility factor m' is used to study the selection behavior of twin variants in the presence of the inhomogeneous local strain.…”

Section: Strain Compatibility Factormentioning

confidence: 99%

A Study of {10-12} Twinning Activity Associated with Stress State in Mg-3Al-1Zn Alloy during Compression

Lu,

Wang,

Yao

et al. 2024

Metals

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An eight-sided prism sample, obtained from a hot-rolled AZ31 magnesium alloy sheet, was compressed at room temperature along the transverse direction to investigate the influence of local strain on twinning behavior using electron backscatter diffraction (EBSD) measurements, hardness distribution, and metallographic observations. The octagonal surface of the sample was divided into distinct regions based on hardness distribution and metallographic observations. Combined analysis of the Schmid factor (SF) and the strain compatibility factor (m’) was employed to study twin variant selection. Basal on SF ratio distribution, the Schmid factor criterion, can predict over 75% of observed twin variants in regions A and D (normal stress samples). In contrast, 64% of twin variant selection behavior in region C (shear stress sample) can be effectively explained using a pure shear model. Twin variants with high strain compatibility factors may prefer activation to reduce stress concentration. The strain compatibility factor is more appropriate than the Schmid factor for analyzing the effect of local strain on the selection behavior of twin variants.

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Section: Strain Compatibility Factormentioning

confidence: 99%