Al_xCoCrCuFeNi (X = 0, 0.8) high entropy alloys fabricated by laser powder bed fusion

Figures & data

Figure 1. (a) SEM image of mixed CoCrFeNiCu powders; (b) SEM image of mixed Al_0.8CoCrFeNiCu powders.

Table 1. Processing parameters for fabricating the HEA blocks in this study.

Samples	P (W)	v (mm·s^−1)	h (mm)	t (mm)	E (J·mm^−3)
CoCrFeNiCu	180–240	1000–2000	0.05	0.03	60–160
Al0.8CoCrFeNiCu	150–250	600–1000	0.05	0.03	100–167

Figure 2. SEM images of microstructures of CoCrCuFeNi HEAs with different VEDs: (a) VED = 60 J/mm³; (b) VED = 80 J/mm³; (c) VED = 120 J/mm³; (d) VED = 160 J/mm³.

Figure 3. The EDS map scanning results of CoCrCuFeNi HEAs around the pore (60 J/mm³).

Figure 4. The EDS map scanning results of CoCrCuFeNi HEAs at crack (160 J/mm³).

Figure 5. The EDS map scanning results of CoCrCuFeNi HEAs in the crack-free area (80 J/mm³).

Figure 6. EBSD images of CoCrCuFeNi HEAs with different VEDs: (a) VED = 60 J/mm³; (b) VED = 80 J/mm³; (c) VED = 120 J/mm³; (d) VED = 160 J/mm³.

Figure 7. Distribution of grain boundaries of CoCrCuFeNi HEAs with different VEDs: (a) VED = 60 J/mm³; (b) VED = 80 J/mm³; (c) VED = 120 J/mm³; (d) VED = 160 J/mm³.

Figure 8. XRD patterns of Al_xCoCrCuFeNi (x = 0, 0.8) HEAs with different VEDs.

Table 2. Content of each element in Al_0.8CoCrCuFeNi HEA samples.

VED (J/mm^3)	Al /at.%	Co /at.%	Cr /at.%	Cu /at.%	Fe /at.%	Ni /at.%
100	12.44	17.77	17.44	17.76	17.55	17.04
120	11.83	16.81	16.70	21.18	16.86	16.62
139	11.53	17.16	16.46	21.74	16.93	16.18
167	10.72	18.00	17.32	18.85	17.70	17.40

Figure 9. SEM images of the surface of Al_0.8CoCrCuFeNi HEAs with different VEDs: (a) VED = 100 J/mm³; (b) VED = 120 J/mm³; (c) VED = 139 J/mm³; (d) VED = 167 J/mm³.

Figure 10. The SEM image and EDS elemental maps showing the liquation cracks of Al_0.8CoCrCuFeNi HEA fabricated with 167 J/mm³.

Figure 11. The EBSD images of Al_0.8CoCrCuFeNi HEAs with different VEDs: (a) VED = 100 J/mm³; (b) VED = 120 J/mm³; (c) VED = 139 J/mm³; (d) VED = 167 J/mm³.

Figure 12. Distribution of FCC phase and BCC phase of Al_0.8CoCrCuFeNi HEAs with different VEDs (Green area: FCC phase; Red area: BCC phase); (a) VED = 100 J/mm³; (b) VED = 120 J/mm³; (c) VED = 139 J/mm³; (d) VED = 167 J/mm³.

Figure 13. Microhardness of Al_xCoCrCuFeNi (x = 0, 0.8) HEAs with different VEDs.

Figure 14. Engineering stress-strain curves of Al_xCoCrCuFeNi (x = 0, 0.8) HEAs with different VEDs.

Figure 15. XRD patterns of the as-deposited Al_0.8CoCrCuFeNi HEAs after annealing treatment.

Figure 16. SEM images of the as-deposited Al_0.8CoCrCuFeNi HEAs after annealing treatment at different temperatures: (a) 600°C (X-Y plane); (b) 900°C (X-Y plane); (c) 600°C (X-Z plane); (d) 900°C (X-Z plane).

Figure 17. Microhardness of the as-deposited Al_0.8CoCrCuFeNi HEAs after annealing treatment.

Figure 18. Compressive engineering stress-strain curves of the as-deposited and heat treated Al_0.8CoCrCuFeNi HEAs.