Novel single crystalline-like non-equiatomic TiZrHfNbTaMo bio-high entropy alloy (BioHEA) developed by laser powder bed fusion

Figures & data

Figure 1. Powder and LPBF-built Ti_28.33Zr_28.33Hf_28.33Nb_6.74Ta_6.74Mo_1.55 BioHEA. (a) SEM image of gas-atomised powder and (b) appearance of LPBF-built jungle gym-shaped product.

Table 1. Overall compositions (at. %) of powder, cast and LPBF-fabricated specimens.

	Ti	Zr	Hf	Nb	Ta	Mo
Powder	28.1	28.0	28.5	6.9	6.8	1.7
Cast	27.7	28.7	28.6	6.8	6.7	1.5
LPBF	28.7	27.9	28.3	6.9	6.6	1.7

Figure 2. Compositional distribution analyses. BSE images and EDS maps for Ti, Zr, and Ta of (a) LPBF-built and (b) cast Ti_28.33Zr_28.33Hf_28.33Nb_6.74Ta_6.74Mo_1.55 BioHEA specimen. (c) Concentrations of constituent elements in the dendrite and inter-dendrite regions of the cast specimen and LPBF specimen determined by EDS. *: P < 0.05.

Figure 3. Crystallographic texture of the LPBF-built specimens. (a) Inverse pole figure maps taken in the orthogonal three planes and (b) the corresponding 001 pole figures. (c) Quantified degree of <001>crystallographic orientation along z-axis. *: P < 0.05.

Figure 4. Mechanical properties of the BioHEA: (a) Yield stress and fracture strain and (b) Young’s modulus of the cast and LPBF-built Ti_28.33Zr_28.33Hf_28.33Nb_6.74Ta_6.74Mo_1.55 BioHEA specimen; *: P < 0.05 by Tukey’s test; a: P < 0.05 vs cast; b: P < 0.05 vs V₁₆₀₀ by t-test.

Figure 5. Biocompatibility of LPBF-fabricated Ti_28.33Zr_28.33Hf_28.33Nb_6.74Ta_6.74Mo_1.55 BioHEA in comparison with cast specimen, CP-Ti, and SUS316L. (a) Quantitative analysis of cell density; *: P < 0.05. (b) Giemsa and (c) fluorescent staining images of osteoblasts adhesion on the specimens.

Data availability statement

Data will be made available on request.