In-situ alloying of a fine grained fully equiaxed Ti-based alloy via electron beam powder bed fusion additive manufacturing process

Alloy design using Additive Manufacturing (AM) methods is an interesting research area attracting the attention of researchers across the world. Formation of strong texture, columnar grains, and chemical inhomogeneity in AM-designed alloys are among the serious challenges dealt with in various resea...

Full description

Saved in:
Bibliographic Details
Published inAdditive manufacturing Vol. 56; p. 102878
Main Authors Mosallanejad, Mohammad Hossein, Niroumand, Behzad, Ghibaudo, Cristian, Biamino, Sara, Salmi, Alessandro, Fino, Paolo, Saboori, Abdollah
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2022
Subjects
Additive manufacturing
Alloy design
Electron beam powder bed fusion
In-situ alloying
Microstructure
Solidification
Ti6Al4V–7Cu
Ti6Al4V–7Cu
Additive manufacturing
Electron beam powder bed fusion
Microstructure
Alloy design
In-situ alloying
Solidification
Online AccessGet full text

Cover

More Information
Summary:Alloy design using Additive Manufacturing (AM) methods is an interesting research area attracting the attention of researchers across the world. Formation of strong texture, columnar grains, and chemical inhomogeneity in AM-designed alloys are among the serious challenges dealt with in various research works. This paper addresses these challenges for the first time for a Ti6Al4V–7Cu alloy produced via Electron Beam Powder Bed Fusion (EB-PBF) method following an in-situ alloying approach. In this work, a mixture of Ti6Al4V and elemental Cu powders was used as the feedstock. The results showed a relatively homogenous Cu distribution in the product due to the large melt pool created during the EB-PBF process, a development indicating the method's applicability for in-situ alloying and alloy design. The prior β columnar grains were effectively converted into equiaxed grains due to a constitutionally supercooled zone created by the rejection of Cu solutes in front of the solidification front and a relatively lower thermal gradient during EB-PBF compared with other AM processes. The addition of Cu enhanced the microhardness of Ti6Al4V, which could be considered an outcome of equiaxed grain formation, solid solution strengthening mechanism, and Ti2Cu intermetallic precipitation.
ISSN:2214-8604
2214-7810
DOI:10.1016/j.addma.2022.102878