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      Sintering Mechanism, Microstructure Evolution, and Mechanical Properties of Ti-Added Mo 2FeB 2-Based Cermets

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          Abstract

          Four series of Mo 2FeB 2-based cermets with Ti contents between 0 wt.% and 1.5 wt.% in 0.5 wt.% increments were prepared by in situ reaction and liquid phase sintering technology. Influences of Ti on microstructure and mechanical properties of cermets were studied. It was found that Ti addition increases formation temperatures of liquid phases in liquid-phase stage. Ti atoms replace a fraction of Mo atoms in Mo 2FeB 2 and the solution of Ti atoms causes the Mo 2FeB 2 crystal to be equiaxed. In addition, the cermets with 1.0 wt.% Ti content exhibit the smallest particle size. The solution of Ti atoms in Mo 2FeB 2 promotes the transformation of Mo 2FeB 2 particles from elongated shape to equiaxed shape. With Ti content increasing from 0 wt.% to 1.5 wt.%, the hardness and transverse rupture strength (TRS) first increase and then decrease. The maximum hardness and TRS occur with 1.0 wt.% Ti content. However, the fracture toughness decreases as Ti content increases. The cermets with 1.0 wt.% Ti content show excellent comprehensive mechanical properties, and the hardness, fracture toughness, and TRS are HRA 89.5, 12.9 MPa∙m 1/2, and 1612.6 MPa, respectively.

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          Most cited references46

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                17 April 2020
                April 2020
                : 13
                : 8
                : 1889
                Affiliations
                State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China; ilovehit3@ 123456126.com (Y.S.); xjtulei@ 123456outlook.com (L.Z.); kmin2015@ 123456stu.xjtu.edu.cn (K.L.); zcao_xjtu@ 123456163.com (Z.C.); xiaopeng_0207@ 123456163.com (P.X.)
                Author notes
                Author information
                https://orcid.org/0000-0003-3018-8385
                Article
                materials-13-01889
                10.3390/ma13081889
                7215874
                32316432
                8522683d-2bc5-4e4c-b69c-df214eb75aa1
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 10 March 2020
                : 14 April 2020
                Categories
                Article

                mo2feb2-based cermets,ti addition,sintering mechanism,microstructure,mechanical properties

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