Understanding common grain boundary twins in Mg alloys by a composite Schmid factor

Xin, Renlong; Liu, Zhe; Sun, Yingjun; Wang, Huamiao; Guo, Changfa; Ren, Weijie; Qing, Liu

doi:10.1016/j.ijplas.2019.07.018

Cited by 47 publications

(4 citation statements)

References 49 publications

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“…The value of m 0 alters from 0 to 1, and a higher m 0 value means better deformation compatibility. Nevertheless, Bieler et al, 56 Sun et al 57 and Xin et al 58 suggested that not only m 0 but also SF sum of the adjacent grains should be taken into account to assess the deformation compatibility. Therefore, in this study, m 0 and (SF 1 •SF 2 ) 1/2 were used to assess the tendency of intergranular cracking.…”

Section: Intergranular Crackingmentioning

confidence: 99%

Quantitative investigation on the deformation modes and cracking behavior during cyclic torsional loading of extruded pure Mg and Mg‐3Y alloy

He,

Wen,

Zheng

et al. 2024

Fatigue Fract Eng Mat Struct

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This study explores the effect of adding 3 wt.% Y to pure magnesium (Mg) on its mechanical behavior under cyclic torsional loadings at room temperature. The research examines deformation and cracking modes in both pure Mg and Mg‐3Y samples. Deformation modes are monitored using quasi‐in‐situ EBSD observations coupled with slip trace analysis. The findings reveal that basal slip dominates the cyclic deformation throughout the fatigue life of the pure Mg sample, while both basal and pyramidal slip dominate the cyclic deformation in the Mg‐3Y sample. Intergranular cracking is the primary cracking mode for both samples under cyclic torsional loadings. Basal and pyramidal slip persistent slip band (PSB) cracking serves as a primary transgranular cracking mode in the pure Mg and Mg‐3Y samples, respectively. The study also investigates the underlying mechanism governing the activity of various deformation modes, cracking modes, and mechanical behavior.

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Section: Intergranular Crackingmentioning

confidence: 99%

Quantitative investigation on the deformation modes and cracking behavior during cyclic torsional loading of extruded pure Mg and Mg‐3Y alloy

He,

Wen,

Zheng

et al. 2024

Fatigue Fract Eng Mat Struct

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“…Dislocation-GB interactions are heavily dependent on the transferability or continuity of slip systems in the two grains across a GB. Geometrical compatibility factor (m') is successfully used to estimate the deformation compatibility across GBs [54][55][56][57][58], where m'=cos(ϕ)×cos(k), ϕ is the angle between the slip plane normal directions and k is the angle between the slip directions. We chose bi-crystals with m' varying from 0.44 to 0.84.…”

Section: Weak Hardening Associated With One Activated Slip Systemmentioning

confidence: 99%

“…Since the adjacent grains differ in orientation, it requires more energy for a dislocation to change slip direction and slip plane and transfer into the adjacent grain [59,60]. The transferability or continuity of slip systems in the two grains across a GB is described by a geometrical compatibility factor (GCF), m'=cos(φ)×cos(k) [54][55][56][57][58]. The bigger the GCF is, the easier slip transmission happens.…”

Section: Grain Boundary Effects On Mechanical Behaviormentioning

confidence: 99%

Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars

Xie¹,

Wei²,

Wu³

et al. 2020

Crystals

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Iron-chromium-aluminum (FeCrAl) alloys are used in automobile exhaust gas purifying systems and nuclear reactors due to its superior high-temperature oxidation and excellent corrosion resistance. Single-phase FeCrAl alloys with a body centered cubic structure plastically deform through dislocation slips at room temperature. Here, we investigated the orientation dependence of mechanical responses of FeCrAl alloy through testing single-crystal and bi-crystal micropillars in a scanning electron microscopy at room temperature. Single-crystal micropillars were fabricated with specific orientations which favor the activity of single slip system or two slip systems or multiple slip systems. The strain hardening rate and flow strength increase with increasing the number of activated slip system in micropillars. Bi-crystal micropillars with respect to the continuity of slip systems across grain boundary were fabricated to study the effect of grain boundary on slip transmission. The high geometrical compatibility factor corresponds to a high flow strength and strain hardening rate. Experimental results provide insight into understanding mechanical response of FeCrAl alloy and developing the mechanisms-based constitutive laws for FeCrAl polycrystalline aggregates.

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“…In spite of 5° deviating from [001] crystallographic orientation for TW specimen, in this case, only one a/ 2〈11 0〉 111 dislocation slip system activates preferentially at the beginning of the creep. Then, the Schmid factor, which commonly affects the activation ability of dislocation slip based on grain orientation [25] (the greater Schmid factor, the higher activation ability on dislocation movement), of this slip system will soon reduce to balance the asymmetrical deformation. In other words, the Schmid factor of other dislocation slip systems is increased.…”

Section: The Characterization Of Creep Behaviors By Uv-dic Systemmentioning

confidence: 99%

In Situ Creep Behavior Characterization of Single Crystal Superalloy by UV-DIC at 980 °C

Shang

Pei

et al. 2019

Coatings

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High temperature creep resistance is a critical characteristic of Ni-based single crystal (SX) superalloys. In this work, the creep behavior of a Ni-based SX superalloy was in situ characterized at 980 °C by ultraviolet (UV) imaging combined two-dimensional digital image correlation (DIC) in vacuum environment. The surface pattern was fabricated to maintain stable over 65 h at 980 °C. The pattern images captured by UV imaging were analyzed using mean gray value and the full-field strain map of creep deformation was obtained. A laser displacement senor (LDS) was employed for measuring the creep strain on the specimen for comparison. The creep deformation result shows a good agreement between DIC and LDS, the microstructure of the different creep areas on the specimens also demonstrate that the results of DIC are reliable. The in situ creep characterization by UV-DIC shows a great potential for investigating creep behaviors at high temperatures.

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Understanding common grain boundary twins in Mg alloys by a composite Schmid factor

Cited by 47 publications

References 49 publications

Quantitative investigation on the deformation modes and cracking behavior during cyclic torsional loading of extruded pure Mg and Mg‐3Y alloy

Quantitative investigation on the deformation modes and cracking behavior during cyclic torsional loading of extruded pure Mg and Mg‐3Y alloy

Crystallographic Orientation Dependence of Mechanical Responses of FeCrAl Micropillars

In Situ Creep Behavior Characterization of Single Crystal Superalloy by UV-DIC at 980 °C

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