The crystallography and deformation modes of hexagonal close-packed metals

Partridge, P. G.

doi:10.1179/095066067790138184

Cited by 212 publications

(157 citation statements)

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“…It is worth noting that the frequency of grain boundaries with misorientations <45º after 360% elongation is larger than the initial distribution which also supports the assumption of a higher stability of this misorientation range in fine-grained magnesium. It should be noted that the frequency of misorientations >80° decreases during tensile deformation up to 50% elongation which suggests twinning does not play a major role during deformation since the twinning in magnesium is expected to promote a rotation of ~86° of the lattice [30]. This is in agreement with the reduced activity of twinning in fine-grained magnesium reported elsewhere [9].…”

Section: Microstructural Evolution During Tensile Testingsupporting

confidence: 80%

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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An investigation was conducted to examine the mechanical behavior and microstructure evolution during deformation of ultrafine-grained pure magnesium at low temperatures within the temperature range of 296 -373 K. Discs were processed by high-pressure torsion until saturation in grain refinement. Dynamic hardness testing revealed a gradual increase in strain rate sensitivity up to m ≈ 0.2. High ductility was observed in the ultrafine-grained magnesium including an exceptional elongation of ~360% in tension at room temperature and stable deformation in micropillar compression. Grain coarsening and an increase in frequency of grain boundaries with misorientations in the range 15°  45° occurred during deformation in tension. The experimental evidence, when combined with an analysis of the deformation behavior, suggests that grain boundary sliding plays a key role in low strain rate deformation of pure magnesium when the grain sizes are at and below ~5 µm.

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Section: Microstructural Evolution During Tensile Testingsupporting

confidence: 80%

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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“…The shear modulus was taken to be 25 GPa at 800°C as approximated using the Voigt-Reuss-Hill model [13] from elastic constant measurements of single crystal titanium [14]. The Burgers vector was set to 0.295 nm for an a dislocation [15].…”

Section: Simulation Parametersmentioning

confidence: 99%

Simulating recrystallization in titanium using the phase field method

Gentry

Thornton

2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Integrated computational materials engineering (ICME) links physics-based models to predict performance of materials based on their processing history. The recrystallization phase field model is developed and parameterized for commercially pure titanium. Stored energy and nucleation of dislocation-free grains are added into a phase field grain-growth model. A two-dimensional simulation of recrystallization in titanium at 800°C was performed; the recrystallized volume fraction was measured from the simulated microstructures. Fitting the recrystallized volume fraction to the Avrami equation gives the time exponent n as 1.8 and the annealing time to reach 50% recrystallization (t0.5) as 71 s. As expected, the microstructure evolves faster when driven by stored energy than when driven by grain boundary energy. IntroductionIntegrated computational materials engineering (ICME) is crucial in advancing material design and optimization. Linking models together will enable simulated parametric studies across length scales, incorporating microstructure into larger-scale component analysis. For example, simulations of static recrystallization are needed for the processing history of metals to be used in microstructural mechanical behavior simulations. As such, successful ICME requires accurate physics-based simulations that predict realistic microstructures.When metals undergo plastic deformation, a network of dislocations is formed within the microstructure. Increasing the applied stress provides an additional driving force for dislocation motion and creates more dislocations. The increased dislocation density results in a stored energy (f stored ) within the microstructure, which is approximated as [1]

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“…In some industries the use of magnesium alloy is very limited due to its poor workability and limited number of existing slip systems in the hexagonal close-packed structure [1][2][3] . Magnesium alloy has found application in structural components such as aerospace and automobile industries [4][5][6] For example, magnesium parts are used in various vehicles in automotive industries such as Benze, Chrysler Jeep, Renault 18 Turbo and Ford light truck vehicles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Scroll Pin Profile and Tool Rotational Speed on Mechanical Properties of Submerged Friction Stir Processed AZ31B Magnesium Alloy

Ramaiyan

Santhanam

Muthuguru³

2018

Mat. Res.

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In this study, an effort has been made to choose an appropriate tool pin profile and rotational speed for a tool using a submerged friction stir processed hot rolled AZ31B magnesium alloy. A defect free process region was obtained using a novel tool shoulder, which consisted of a scroll. Three tool pin profiles, namely, simple cylindrical, stepped cylindrical and stepped square pin have been used. Tensile properties and fracture behavior revealed defect free friction stir processed specimens. The microstructural studies reveal the possibility of producing a defect free processed region using the stepped square pin tool geometry. The presence of fine recrystallized grains (1.99 µm) and the absence of defects in the processed region lead to higher hardness and superior tensile properties.

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The crystallography and deformation modes of hexagonal close-packed metals

Cited by 212 publications

References 0 publications

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Simulating recrystallization in titanium using the phase field method

Effect of Scroll Pin Profile and Tool Rotational Speed on Mechanical Properties of Submerged Friction Stir Processed AZ31B Magnesium Alloy

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