Stability and strain-driven evolution of β′ precipitate in Mg-Y alloys

Solomon, Ellen L.S.; Natarajan, Anirudh Raju; Marquis, Emmanuelle A.; Sundararaghavan, Veera; Ven, Anton Van der; Marquis, Emmanuelle A.

doi:10.1016/j.actamat.2018.12.026

Cited by 69 publications

(12 citation statements)

References 35 publications

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“…The developed constitutive model is programmed into the finite element analysis to simulate the viscoplastic deformation of solder joints. Solomon et al 28 showed that through combination of high-resolution characterization, density functional theory calculations, and finite-element elasticity studies, we demonstrate that the strengthening phase is thermodynamically stable at low temperatures, as opposed to metastable as, highlighting the importance of using numerical methods and mathematical models.…”

Section: Introductionmentioning

confidence: 71%

Modeling and Numerical Validation of Stress-Strain Curves of Maraging Steels, Grades 300 and 350 Under Hydrogen Embrittlement

et al. 2021

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Maraging steels are ferrous alloys with Ni, Co, Mo, and Ti additions. These materials are a special class of ultra high mechanical strength steels with wide and special applications in strategic areas, which makes their knowledge very valuable. Computational advances allowed to analyze the behavior of these materials numerically, using the finite element method and developing mathematical models that can represent numerically its mechanical behavior. The present work has the objective of surveying the mechanical properties of maraging steels 300 and 350 by slow strain rate tensile (SSRT) tests, after the solution treatment at 1183K for 1h. Additionally, it was evaluated the hydrogen embrittlement in samples tested by SSRT under cathodic protection with a potential -1.2 VSCE in 3.5% NaCl solution.The study was complemented with detailed fractographic analysis. This work also presents the analysis of representative models by use of Hollomon, Swift, Voce and coupled Swift-Voce equations to describe the strain-hardening behavior. Compared to the others, the Voce's model was the one which best fitted the experimental results, with values of R 2 higher than 0.992. Through the variation of the chemical composition found in the different grades of maraging steels, this work contemplates the creation of a generalized Voce model based on the variation of the Ti content. The work concludes presenting the generalized Voce model proposed and a numerical analysis of the SSRT results with a good accuracy of the strain-hardening response.

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Section: Introductionmentioning

confidence: 71%

Modeling and Numerical Validation of Stress-Strain Curves of Maraging Steels, Grades 300 and 350 Under Hydrogen Embrittlement

et al. 2021

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“…Among these advanced techniques, atomic-resolution STEM-HAADF imaging technique in Cs-or/and Cc-corrected TEM, combining with EDS and EELS, has become a mainstay in recent years for characterization of precipitates with size in the order of only a few nanometers. [9,[129][130][131] Starting with these high-resolution imaging and spectroscopy techniques, the capabilities of various novel methods used for studying precipitation are elucidated below in sequence.…”

Section: Tem-based Methods For Precipitation Analysismentioning

confidence: 99%

“…Spectroscopy techniques include EELS [129][130][131]134,138] and EDS. [123,126,127] EELS works on the principle of identification and separation of inelastically scattered electrons of different energy that have transmitted through the specimen after interactions with the sample material, resulting in a spectrum of electron intensity against the energy lost in the interaction.…”

Section: Spectroscopymentioning

confidence: 99%

On the role of transmission electron microscopy for precipitation analysis in metallic materials

Zhou

Babu

Hou

et al. 2021

Critical Reviews in Solid State and Materials Sciences

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Precipitation hardening is one of the most important strengthening mechanisms in metallic materials, and thus, controlling precipitation is often critical in optimizing mechanical performance. Also other performance requirements such as functional and degradation properties are critically depending on precipitation. Control of precipitation in metallic materials is, thus, vital, and the approach presently in the limelight for this purpose is an integrated approach of theory, computations and experimental characterization. An empirical understanding is essential to build physical models upon and, furthermore, quantitative experimental data is needed to build databases and to calibrate the models. The most versatile tool for precipitation characterization is the transmission electron microscope (TEM). The TEM has sufficient resolving power to image even the finest precipitates, and with TEMbased microanalysis, overall quantitative data such as particle size distribution, volume fraction and number density of particles can be gathered. Moreover, details of precipitate structure, morphology and chemistry, can be revealed. TEM-based postmortem and in situ analysis of precipitation has made significant progress over the last decade, largely stimulated by the widespread application of aberration corrected microscopes and accompanying novel analytics. The purpose of this report is to review these recent developments in precipitation analysis methodology, including sample preparation. Application examples are provided for precipitation analysis in metals, and future prospects are discussed.

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“…Also, it has been experimentally observed that several phases of precipitates can develop in Mg-Zn and Al-Zn-Mg alloys, including MgZn, monoclinic Mg 4 Zn 7 , η-MgZn 2 , β-MgZn 2 with hexagonal symmetry, Mg 2 Zn 3 , and Mg 2 Zn 11 [37][38][39][40][41][42][43] . Recent systematic investigations have demonstrated that the morphology and structural evolution of precipitates in Mg alloys are closely linked to their internal sub-unit cell arrangements, the aspect ratio of precipitates, misfit strains, and their interaction with matrix interfaces 37,[44][45][46] .…”

Section: Introductionmentioning

confidence: 99%

Density functional simulations of pressurized Mg-Zn and Al-Zn alloys

Alidoust

Kleiven

Akola

2020

Phys. Rev. Materials

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The Mg-Zn and Al-Zn binary alloys have been investigated theoretically under static isotropic pressure. The stable phases of these binaries on both initially hexagonal-close-packed (HCP) and face-centered-cubic (FCC) lattices have been determined by utilizing an iterative approach that uses a configurational cluster expansion method, Monte Carlo search algorithm, and density functional theory (DFT) calculations. Based on 64-atom models, it is shown that the most stable phases of the Mg-Zn binary alloy under ambient condition are MgZn 3 , Mg 19 Zn 45 , MgZn, and Mg 34 Zn 30 for the HCP, and MgZn 3 and MgZn for the FCC lattice, whereas the Al-Zn binary is energetically unfavorable throughout the entire composition range for both the HCP and FCC lattices under all conditions. By applying an isotropic pressure in the HCP lattice, Mg 19 Zn 45 turns into an unstable phase at P≈10 GPa, a new stable phase Mg 3 Zn appears at P 20 GPa, and Mg 34 Zn 30 becomes unstable for P 30 GPa. For FCC lattice, the Mg 3 Zn phase weakly touches the convex hull at P 20 GPa while the other stable phases remain intact up to ≈120 GPa. Furthermore, making use of the obtained DFT results, bulk modulus has been computed for several compositions up to pressure values of the order of ≈120 GPa. The findings suggest that one can switch between Mg-rich and Zn-rich early-stage clusters simply by applying external pressure. Zn-rich alloys and precipitates are more favorable in terms of stiffness and stability against external deformation.

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Stability and strain-driven evolution of β′ precipitate in Mg-Y alloys

Cited by 69 publications

References 35 publications

Modeling and Numerical Validation of Stress-Strain Curves of Maraging Steels, Grades 300 and 350 Under Hydrogen Embrittlement

Modeling and Numerical Validation of Stress-Strain Curves of Maraging Steels, Grades 300 and 350 Under Hydrogen Embrittlement

On the role of transmission electron microscopy for precipitation analysis in metallic materials

Density functional simulations of pressurized Mg-Zn and Al-Zn alloys

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