Alloying strategies for additive manufacturing of Ti6Al4V based alloys, composites and functionally graded materials: Microstructure and phase evolution of intra and inter-layer

• DOI: 10.1016/j.jmrt.2023.11.060
• Publication Date: 2023-11-11T08:04:48Z
• Authors: Yilei Shi; Shuili Gong; Haiying Xu; Zhuang Wang; Guang Yang; Bojin Qi
• Keywords: Ductility (Earth science); Titanium alloy; Equiaxed crystals; Delamination

The further developments of additive manufacturing (AM) provides a possibility for Ti6Al4V and its functionally graded materials (FGMs), but limits applications due to low ductility, microhardness poor wear resistance. key lies in the presence microstructures such as epitaxial columnar β-grain orientation heterogeneous phase distribution AM Ti6Al4V, well interfacial bonding problems (intermetallic phases, delamination, cracking) FGMs. In order address these fundamental intra inter-layer problems, firstly microstructure evolution process columnar-to-equiaxed transformation (CET) promoted by some alloying strategies was summarized this paper according elements reinforcing particle types. Subsequently, controlled changes composition FGMs were achieved adding interlayers/introducing gradient interfaces, metallurgical reactions mechanisms that inhibit formation intermetallic compounds defects explored. Finally, difficulties future research directions achieve high strength ductility presented. This review aims improve reliability critical load-bearing structures through in-situ multi-material design Ti6Al4V.