Thermally Activated Nature of Basal and Prismatic Slip in Mg and Its Alloys

Published on Jan 1, 2021
· DOI :10.1007/978-3-030-65528-0_9
Mohammed A. Shabana1
Estimated H-index: 1
,
Jishnu J. Bhattacharyya13
Estimated H-index: 13
+ 1 AuthorsSean R. Agnew54
Estimated H-index: 54
Source
Abstract
References37
Newest
#1Jishnu J. Bhattacharyya (UVA: University of Virginia)H-Index: 13
#2Taisuke Sasaki (National Institute for Materials Science)H-Index: 35
Last. Sean R. Agnew (UVA: University of Virginia)H-Index: 54
view all 6 authors...
Abstract Microalloyed, age-hardenable Mg alloys can exhibit an excellent balance between strength and ductility. One such alloy, AXM10304 (Mg-1.31Al-0.33Ca-0.46Mn in wt. %), possesses high extrudability with mechanical properties comparable to 6xxx-series Al alloys at considerably lower density. The mechanical properties are due to the presence of a high number density of disc-shaped GP zones parallel to the basal planes. The present work focuses on providing a mechanistic understanding of the e...
8 CitationsSource
#1Vikaas Bajikar (UVA: University of Virginia)H-Index: 1
#2Jishnu J. Bhattacharyya (UVA: University of Virginia)H-Index: 13
Last. Sean R. Agnew (UVA: University of Virginia)H-Index: 54
view all 4 authors...
It is of interest to assess the thermally activated nature of the deformation mechanisms responsible for the anisotropic response of textured Mg alloys, especially in those alloys that do and do not contain rare earth elements. The repeated stress relaxation method in combination with elasto-viscoplastic self-consistent (EVPSC) polycrystal modeling is employed to determine the strain rate sensitivity and true activation volume of samples of textured, polycrystalline Mg alloys, ME10 and AZ31, loa...
1 CitationsSource
#1C.J. Silva (McMaster University)H-Index: 4
#2A. Kula (AGH University of Science and Technology)H-Index: 10
Last. Marek Niewczas (McMaster University)H-Index: 24
view all 4 authors...
Abstract An investigation into the effect of scandium on the mechanical properties of dilute binary Mg–Sc alloys deformed under tension has been conducted at 298 K, 78 K and 4.2 K. The relatively small improvement in strength and ductility is discussed in terms of the effect of Sc on texture, deformation modes and solute strengthening. Constitutive modelling results predict an increased relative activity of prismatic 〈 a 〉 and 〈 c + a 〉 slip with Sc solute addition. A minor decrease in stacking ...
10 CitationsSource
#1Huamiao Wang (McMaster University)H-Index: 24
#2Peidong Wu (McMaster University)H-Index: 51
Last. Dayong Li (SJTU: Shanghai Jiao Tong University)H-Index: 18
view all 7 authors...
Abstract Strain rate sensitivity (SRS) is an important material property that governs the rate dependent mechanical behaviors associated with deformation rate changes, creep, stress relaxation, formability, etc. The variety of activated deformation mechanisms of magnesium alloys under different loading paths, e.g. tension vs. compression, implies that SRS of magnesium alloys obviously depends on loading paths, and each deformation mechanism has its own SRS. However, a single SRS scheme is common...
53 CitationsSource
#1A. Tehranchi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 10
#2Binglun Yin (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 13
Last. William A. Curtin (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 79
view all 3 authors...
Abstract Strengthening of basal slip could enhance formability of magnesium by decreasing the ratio of pyramidal to basal critical resolved shear stress (P/B CRSS ratio). Here solute strengthening of basal slip is predicted for a wide range of solutes as a function of temperature and solute concentration at experimental strain rates using a recently-developed parameter-free model. The model is simplified by approximating the solute/dislocation interaction energy as the sum of a misfit strain con...
48 CitationsSource
#1A. Kula (AGH University of Science and Technology)H-Index: 10
#2X. Jia (McMaster University)H-Index: 1
Last. Marek Niewczas (McMaster University)H-Index: 24
view all 4 authors...
Abstract Flow stress and work hardening behaviour of Mg-Y binary alloys have been studied under uniaxial tension and compression at 4 K, 78 K and 298 K. Electron microscopy observations show that Yttrium forms multi-atomic clusters distributed randomly in Mg matrix. During thermomechanical processing, Y accumulates at the grain boundaries and controls recrystallization texture, which acquires lower intensity of the basal component and higher degree of randomness in comparison to polycrystalline ...
53 CitationsSource
#1C.J. Silva (McMaster University)H-Index: 4
#2A. Kula (AGH University of Science and Technology)H-Index: 10
Last. Marek Niewczas (McMaster University)H-Index: 24
view all 4 authors...
Abstract The flow stress and work hardening behaviour during uniaxial compression of dilute binary Mg-Sc alloys have been studied at 4.2 K, 78 K and 298 K. The influences of atomic misfit, chemical misfit, solute electronic properties and stacking fault energy (SFE) on strength and ductility have been examined. The results suggest that the small atomic misfit and the reduction of SFE due to Sc additions are decisive factors in determining the mechanical behaviour of the alloys. Mg-Sc alloys defo...
16 CitationsSource
#1Gerard Leyson (MPG: Max Planck Society)H-Index: 11
#2William A. Curtin (École Polytechnique)H-Index: 79
The high temperature behavior of solute strengthening has previously been treated approximately using various scaling arguments, resulting in logarithmic and power-law scalings for the stress-dependent energy barrier Delta E(tau) versus stress tau. Here, a parameter-free solute strengthening model is extended to high temperatures/low stresses without any a priori assumptions on the functional form of Delta E(tau). The new model predicts that the well-established low-temperature, with energy barr...
27 CitationsSource
#1Gerard Leyson (MPG: Max Planck Society)H-Index: 11
#2William A. Curtin (École Polytechnique)H-Index: 79
The temperature-dependent flow behavior in nominally binary Al-Mg alloys measured recently (Jobba etal., 2015; Niewczas et al., 2015) is interpreted in the context of a parameter-free solute strengthening model. The recent measurements show consistently higher strengths as compared to literature data on true binary Al-Mg alloys, which is attributed to the presence of Fe in the nominally binary Al-Mg. Using the Fe concentration as a single fitting parameter, the model predictions for the newer ma...
10 CitationsSource
#1Catherine J. SilvaH-Index: 1
#1Catherine J. SilvaH-Index: 1
2 Citations
Cited By1
Newest
#1Mohammed A. Shabana (UVA: University of Virginia)H-Index: 1
#2Jishnu J. Bhattacharyya (UVA: University of Virginia)H-Index: 13
Last. Sean R. Agnew (UVA: University of Virginia)H-Index: 54
view all 4 authors...
Abstract The principle of “stress equivalence” proposed by Basinski et al. offers insight regarding the nature of thermally activated plasticity of solid solution alloys of FCC and HCP (Mg) crystal structures at low temperatures. More recently, Leyson and Curtin have developed a theoretical framework which builds upon the Labusch solute strengthening model. The current work analyzes some recent results from the literature (for single crystal Mg-Zn, Mg-Y, and Mg-Dy) which permit a further examina...
Source