Electron beam melting of (FeCoNi)86Al7Ti7 high-entropy alloy

• Published in: Journal of alloys and compounds 2023-10, Vol.960, p.170752, Article 170752
• Main Authors: Peng, Cong, Jia, Yandong, Liang, Jian, Xu, Long, Wang, Gang, Mu, Yongkun, Sun, Kang, Ma, Pan, Prashanth, Konda Gokuldoss
• Format: Article
• Language: English
• Subjects: Duplex microstructure; High entropy alloy; Metal additive manufacturing; Selective electron beam melting
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.170752

The development of traditional alloy materials has reached the bottleneck due to the constructive interaction between strength and plasticity. Hence, novel alloy systems like (FeCoNi)86Al7Ti7 high-entropy alloys (HEAs) were fabricated using selective electron beam melting (SEBM). The (FeCoNi)86Al7Ti7 HEA dominantly consisted of ordered L12 and disordered fcc matrix phases. The bottom surface (SEBM-bottom)) of the (FeCoNi)86Al7Ti7 HEA blocks presents an equiaxed microstructure; however, coarse columnar grains across layers were observed along the building direction (SEBM-side). Island-like precipitates (ILPs) are distributed evenly within the equiaxed grain. The boundaries of columnar grains and high-density multicomponent cubic nanoparticles (MCCNPs) are dispersed uniformly in the matrix. A strong // building direction (BD) fiber texture can be observed. The (FeCoNi)86Al7Ti7 HEA exhibits superior strengths of 2048 MPa and up to 12% ductility at ambient temperature. However, the SEBM (FeCoNi)86Al7Ti7 HEA exhibits anisotropy in its mechanical properties. •(FeCoNi)86Al7Ti7 alloy was successfully fabricated via the selective electron beam melting process (SEBM).•(FeCoNi)86Al7Ti7 alloy presents an equiaxed microstructure in the bottom and coarse columnar grains along the building direction.•(FeCoNi)86Al7Ti7 HEA achieves superb superior strengths of 2048 MPa and ductility as high as 12%.•SEBM specimen exhibited anisotropy in mechanical properties.