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      Stability, Mechanical Properties and Anisotropic Elastic Properties of GaxMgy Compounds

      research-article
      , ,
      Materials Research
      ABM, ABC, ABPol
      Gallium alloy, First-principle calculation, Mechanical properties, Anisotropy

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          Abstract

          The stability, mechanical properties and anisotropic properties of sound velocities of Ga2Mg5, GaMg2, GaMg, O-Ga2Mg, H-Ga2Mg and Ga5Mg2 are investigated systematically by the first-principles calculation. The cohesive energy and formation enthalpy are obtained and used to estimate the stability of the Ga-Mg binary compounds. GaMg compound is the most stable and has the lowest formation enthalpy as -0.162eV/atom of those GaxMgy compounds. The elastic constants of single crystal, hardness, bulk, shear, Young's modulus and Poisson's ratio of the polycrystalline crystal are obtained and used to estimate the mechanical properties. Ga5Mg2 and H-Ga2Mg have the lager bulk, shear and Young’s modulus and corresponding B/G is low. H-Ga2Mg is harder than the other compounds from the results of Poisson’s ratio. The anisotropic mechanical properties are discussed using the anisotropic index, two-dimensional planar projections on different planes of the bulk and Young's modulus. The Young's modulus of H-Ga2Mg shows the strongly anisotropy of mechanical properties and GaMg2 has the weakest anisotropy among all the compounds.

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          Modeling hardness of polycrystalline materials and bulk metallic glasses

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            Direct Desktop Printed-Circuits-on-Paper Flexible Electronics

            There currently lacks of a way to directly write out electronics, just like printing pictures on paper by an office printer. Here we show a desktop printing of flexible circuits on paper via developing liquid metal ink and related working mechanisms. Through modifying adhesion of the ink, overcoming its high surface tension by dispensing machine and designing a brush like porous pinhead for printing alloy and identifying matched substrate materials among different papers, the slightly oxidized alloy ink was demonstrated to be flexibly printed on coated paper, which could compose various functional electronics and the concept of Printed-Circuits-on-Paper was thus presented. Further, RTV silicone rubber was adopted as isolating inks and packaging material to guarantee the functional stability of the circuit, which suggests an approach for printing 3D hybrid electro-mechanical device. The present work paved the way for a low cost and easygoing method in directly printing paper electronics.
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              Gallium-rich Pd–Ga phases as supported liquid metal catalysts

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos, SP, Brazil )
                1516-1439
                1980-5373
                February 2019
                : 22
                : 2
                : e201800624
                Affiliations
                [1] Changsha orgnameHunan Biological and Electromechanical Polytechnics orgdiv1Department of Mechanical and Electrical Engineering China
                [2] Kunming China orgnameKunming University of Science and Technology orgdiv1Faculty of Material Science and Engineering
                Article
                S1516-14392019000200232
                10.1590/1980-5373-mr-2018-0624
                88cc3c4c-fbad-4563-9d62-18528cba858c

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 19 September 2018
                : 20 November 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 62, Pages: 0
                Product

                SciELO Brazil

                Categories
                Articles

                Gallium alloy,First-principle calculation,Mechanical properties,Anisotropy

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