In situ X-ray diffraction and crystal plasticity modeling of the deformation behavior of extruded Mg–Li–(Al) alloys: An uncommon tension–compression asymmetry

Lentz, Martin; Klaus, Manuela; Beyerlein, Irene J.; Zecevic, Milovan; Reimers, W.; Knežević, Marko

doi:10.1016/j.actamat.2014.12.003

Cited by 124 publications

(48 citation statements)

References 54 publications

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“…Meanwhile, the air-cooled sample revealed a remarkably decreased strength compared to the water-cooled one [27]. Similar results were also observed in extruded Mg-Li-(Al) alloys [28]. Therefore, the different cooling conditions should have some influence on the development of microstructure and mechanical properties of the Mg-1Y alloy, which needs further investigation.…”

Section: Microstructuressupporting

confidence: 53%

Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy

Wei

Huang

Yin

et al. 2017

Metals

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Microstructure and mechanical properties development of extruded Mg-1Y (wt. %) binary alloy during equal channel angular pressing (ECAP) with route B c at 400 • C, and subsequent annealing treatment between 300-400 • C at different holding time of 5-120 min were investigated using an optical and scanning electron microscope (SEM), electron back scattered diffraction (EBSD), tensile test, and hardness test. The grain size of as-extruded material (~10.9 µm) was refined significantly by 1-pass ECAP (~5.8 µm), and resulted in a remarkably enhanced elongation to failure (EL) (~+62%) with a slightly decreased ultimate tensile strength (UTS) (~−3%) comparing to the as-extruded condition (EL = 11.3%, UTS = 200 MPa). The EL was further increased to 27.3% (~+142%) after four passes of ECAP comparing to the as-extruded condition, which was mainly caused by the much more homogenized microstructure. The split basal poles with about 60 • rotations to the extruded direction (ED), the relatively coarsened grain size by static recrystallization (SRX) and post-dynamic recrystallization (PDRX) after four passes of ECAP might be responsible for the decreased strength with increasing ECAP pass. During the annealing treatment, recovery dominantly occurred at 300 • C, SRX and grain growth emerged at 350 • C and 400 • C, respectively. Meanwhile, the grain grew and hardness decreased rapidly even within 5 min for 1-pass ECAPed material at 400 • C, indicating a larger grain boundary mobility of ECAPed materials induced by higher deformation energy than the as-extruded ones.

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Section: Microstructuressupporting

confidence: 53%

Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy

Wei

Huang

Yin

et al. 2017

Metals

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“…This ranking is consistent with the results from the works of others on the same or similar Mg-Li alloys. [16][17][18] We also find that temperature profoundly impacts the initial barrier for pyramidal slip but only mildly for basal and prismatic slip. The pronounced CRSS drop for pyramidal slip agrees with measurements made in single crystals of pure Mg. [11,42] Consequently, as temperature increases, the CRSS values for the different slip modes as well as twinning draw closer and the crystal intrinsically becomes less anisotropic.…”

Section: Modeling Resultsmentioning

confidence: 68%

“…For Mg and Mg alloys, basal slip is the easiest a h i slip. [5,6] Prismatic a h i slip is relatively harder but thought to be more prominent in Mg-Li alloys than in pure Mg. [16,17] For pyramidal c þ a h i slip, there are two types of slip families, pyramidal type I and II slip, differing in the crystallographically of their glide plane. Over the years, studies via TEM, in-situ TEM, and slip trace analyses have provided evidence in support of both types.…”

Section: Modeling Resultsmentioning

confidence: 99%

“…In the prior work of Lentz et al, [17] the EPSC model was used to characterize the hardening parameters for these three slip systems and the twinning mode for Mg-4 wt pct Li at room temperature only. In this work, having tests at multiple temperatures, we can better characterize material parameters associated with thermally activated recovery.…”

Section: Modeling Resultsmentioning

confidence: 99%

“…They also suggested that the activity of pyramidal c þ a h islip was higher in Mg-4 wt pct Li than conventional Mg alloys. [17] Agnew et al [13,18] suggested that Li lowered the nonbasal stacking fault energy and increased the stability of nonbasal dislocation glide.…”

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confidence: 99%

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Elevated Temperature Effects on the Plastic Anisotropy of an Extruded Mg-4 Wt Pct Li Alloy: Experiments and Polycrystal Modeling

Risse

Lentz

Fahrenson

et al. 2016

Metall Mater Trans A

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In this work, we study the deformation behavior of Mg-4 wt pct Li in uniaxial tension as a function of temperature and loading direction. Standard tensile tests were performed at temperatures in the range of 293 K (20°C) £ T £ 473 K (200°C) and in two in-plane directions: the extrusion and the transverse. We find that while the in-plane plastic anisotropy (PA) decreases with temperature, the anisotropy in failure strain and texture development increases. To uncover the temperature dependence in the critical stresses for slip and in the amounts of slip and twinning systems mediating deformation, we employ the elastic-plastic self-consistent polycrystal plasticity model with a thermally activated dislocation density based hardening law for activating slip with individual crystals. We demonstrate that the model, with a single set of intrinsic material parameters, achieves good agreement with the stress-strain curves, deformation textures, and intragranular misorientation axis analysis for all test directions and temperatures. With the model, we show that at all temperatures the in-plane tensile behavior is driven primarily by a h i slip and both c þ a h islip and twinning play a minor role. The analysis explains that the in-plane PA decreases and failure strains increase with temperature as a result of a significant reduction in the activation stress for pyramidal c þ a h i slip, which effectively promotes strain accommodation from multiple types of a h i and c þ a h i slip. The results also show that because of the strong initial texture, in-plane texture development is anisotropic since prismatic slip dominates the deformation in one test, although it is not the easiest slip mode, and basal slip in the other. These findings reveal the relationship between the temperature-sensitive thresholds needed to activate crystallographic slip and the development of texture and macroscopic PA.

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Multiscale Statistical Study of Twinning inHCPMetals

Tomé

Beyerlein

McCabe

et al. 2018

Integrated Computational Materials Engineering (ICME) for Metals

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In situ X-ray diffraction and crystal plasticity modeling of the deformation behavior of extruded Mg–Li–(Al) alloys: An uncommon tension–compression asymmetry

Cited by 124 publications

References 54 publications

Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy

Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy

Elevated Temperature Effects on the Plastic Anisotropy of an Extruded Mg-4 Wt Pct Li Alloy: Experiments and Polycrystal Modeling

Multiscale Statistical Study of Twinning inHCPMetals

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