Experimental Study on Mechanical Properties of FeCoNiCr High-Entropy Alloy by Selective Laser Melting

doi:10.12068/j.issn.1005-3026.2025.20230333

Abstract

Abstract:

Through experimental research on the influencing factors of mechanical properties of FeCoNiCrAl_0.5 and FeCoNiCrTi_0.5 high-entropy alloy formed specimens prepared by the selective laser melting method， the changes of density and hardness of the high-entropy alloy with laser power， scanning speed and scanning spacing， as well as the effects of powder type and element type on the tensile properties were investigated， and the tensile fracture morphology of the high-entropy alloy specimens was analyzed. The experimental results showed that the density and hardness of the specimens increase at first and then decrease with the increase of laser power， scanning speed and scanning spacing. Compared with the mixed powder， the tensile properties of FeCoNiCrAl_0.5 specimen prepared by alloyed powder are better， FeCoNiCrTi_0.5 high-entropy alloy has higher tensile strength and stronger toughness than FeCoNiCrAl_0.5 high-entropy alloy. The tensile fracture of FeCoNiCrAl_0.5 formed specimen prepared by mixed powder and alloyed powder is mostly brittle and ductile fracture， while the FeCoNiCrTi_0.5 formed specimen prepared by mixed powder are mainly plastic fracture.

Key words: high-entropy alloy, selective laser melting, density, hardness, tensile property

CLC Number:

TH 161

Xue-long WEN, Zheng-hao ZHAO, Lin-yuan SONG, Cheng-bao WANG. Experimental Study on Mechanical Properties of FeCoNiCr High-Entropy Alloy by Selective Laser Melting[J]. Journal of Northeastern University(Natural Science), 2025, 46(6): 76-85.

Figures/Tables 16

Fig.1 SLM principle diagram

Fig.2 Experimental equipment

Table 1 Statistical table of powder particle size (mass fraction)

粒径/μm	FeCoNiCrAl_0.5（混合粉）	FeCoNiCrAl_0.5（合金粉）	FeCoNiCrTi_0.5（混合粉）
总计	100	100	100
10~20	63.90	37.4	31.2
>20~30	23.90	39.8	36.4
>30~40	8.90	13.5	17.8
>40~50	3.15	6.9	8.4
>50~60	0.10	1.8	4.4
>70~110	0.05	0.6	1.8

Fig.3 Tensile specimen (unit:mm)

Table 2 Orthogonal experiment parameters

激光工艺参数	水平
激光工艺参数	1	2	3	4
激光功率/W	250	300	350	400
扫描速度/(mm·s^-1）	600	700	800	900
扫描间距/μm	50	60	70	80

Fig.4 Effect of laser power on density

Fig.5 Effect of scanning speed on density

Fig.6 Effect of scanning spacing on density

Fig.7 Effect of laser power on hardness

Fig.8 Effect of scanning speed on hardness

Fig.9 Effect of scanning spacing on hardness

Fig.10 Effect of FeCoNiCrAl0.5 powder type on tensile properties

Fig.11 Influence of elements on tensile properties

Fig.12 Fracture morphology of FeCoNiCrAl0.5

Fig.13 Fracture morphology of FeCoNiCrTi0.5

Fig.14 Fracture morphology of FeCoNiCrTi0.5

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