In-situ synthesis of Ti2AlNb-based intermetallic alloy by selective laser melting

Ti2AlNb-based intermetallic alloys are considered to be one of the excellent potential materials applied in engineering practice. Selective laser melting (SLM) is a promising technology for manufacturing of parts with a combination of complex design and high mechanical properties. The possibility of...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-05, Vol.704, p.434-442
Main Authors: Grigoriev, Alexey, Polozov, Igor, Sufiiarov, Vadim, Popovich, Anatoly
Format: Article
Language:English
Subjects:
Additive manufacturing
In situ alloying
Microhardness
Microstructure
Selective laser melting
Ti-22Al-25Nb alloy
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Summary:Ti2AlNb-based intermetallic alloys are considered to be one of the excellent potential materials applied in engineering practice. Selective laser melting (SLM) is a promising technology for manufacturing of parts with a combination of complex design and high mechanical properties. The possibility of in-situ synthesis of Ti-22Al-25Nb and Ti-5Al alloys using elemental powder mixtures has been demonstrated in this paper. The bulk samples were produced using 275 W and 950 W laser power. The microstructure, phase composition, microhardness of the produced material have been studied in this work, as well as the effect of heat treatment by means of homogenizing annealing and subsequent aging on the microstructure and chemical homogeneity of the material. It has been shown that Ti-22Al-25Nb material, produced by SLM, after annealing consists of B2-grains with Ti2AlNb and Ti3Al precipitates with homogeneous distribution of the elements in the bulk material. [Display omitted] •Ti-22Al-25Nb alloy has been in-situ synthesized by selective laser melting.•The microstructure consists of B2-grains with precipitates of Ti2AlNb-phase.•The alloy produced by selective laser melting has microhardness 358.1 ± 5.8HV0.5
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.02.086