Formation of a bimetallic Ti–Al material by a wire-feed electron-beam additive manufacturing

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Abstract

Currently, there is a request from aerospace and aircraft for the construction materials with sufficiently high mechanical strength, thermal creep, corrosion and oxidation resistance. The conventional alloys used for these purposes are too heavy. At the same time, alternative light materials such as Ti–Al-based alloys have many flaws, when they are produced by conventional methods. This work considers the possibility to produce the Ti–Al-based alloys by the method of a wire-feed electron-beam additive manufacturing (EBAM). We study the chemical and phase compositions, microstructure and microhardness of a bimetallic Ti–Al alloy, obtained by this method. It is found the formation of five characteristic regions between titanium and aluminum parts of the bimetallic billet. The mixing zone consists of TiAl and TiAl3 intermetallics, that is confirmed by the investigation of microstructure, chemical and phase compositions. According to XRD (X-ray diffraction) and EDS (energy-dispersive X-ray spectroscopy) analyses, it can be assumed that TiAl intermetallic prevails over TiAl3 one. The average microhardness of the mixing zone equals to 450 HV (≈4.4 GPa). This zone has developed dendritic microstructure, and even distribution of the phases without link to dendritic and inter-dendritic zones. The cracks appearing in this area are filled with the material of the upper layers, so the whole material is poreless and defect-free. Thus, the results of this work have shown a fundamental possibility to produce the intermetallic Ti–Al alloys with the use of the EBAM.

About the authors

Andrey V. Luchin

Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk

Author for correspondence.
Email: luchin250398@yandex.ru
ORCID iD: 0000-0003-4020-0755

postgraduate student, research engineer of “Physics of Hierarchical Structures of Metals and Alloys” Laboratory

Россия

Elena G. Astafurova

Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk

Email: lena.g.astafurova@gmail.com
ORCID iD: 0000-0002-1995-4205

Doctor of Sciences (Physics and Mathematics), Associate Professor, chief researcher of “Physics of Hierarchical Structures of Metals and Alloys” Laboratory

Россия

Sergey V. Astafurov

Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk

Email: svastafurov@gmail.com
ORCID iD: 0000-0003-3532-3777

PhD (Physics and Mathematics), senior researcher of “Physics of Hierarchical Structures of Metals and Alloys” Laboratory

Россия

Kseniya A. Reunova

Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk

Email: reunova.ksenya@mail.ru
ORCID iD: 0000-0002-1318-1010

postgraduate student, junior researcher of “Physics of Hierarchical Structures of Metals and Alloys” Laboratory

Россия

Elena A. Zagibalova

Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk

Email: zagibalova-lena99@mail.ru
ORCID iD: 0000-0002-2079-7198

student, engineer of “Physics of Hierarchical Structures of Metals and Alloys” Laboratory

Россия

Eugeny A. Kolubaev

Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk

Email: eak@ispms.ru
ORCID iD: 0000-0001-7288-3656

Doctor of Sciences (Engineering), Professor, Director 

Россия

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