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Chinese Journal of Materials Research  2021, Vol. 35 Issue (9): 712-720    DOI: 10.11901/1005.3093.2020.402
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Effect of Al Content on Properties of CrFeNiAlxSi High Entropy Alloy
LI Gang1,2(), WEN Ying1, YU Zhongmin1, LIU Jian1, XIONG Zilian1
1.College of Mines, Liaoning Technical University, Fuxin, 123000, China
2.Yingkou Institute of Technology, Yingkou 115000, China
Cite this article: 

LI Gang, WEN Ying, YU Zhongmin, LIU Jian, XIONG Zilian. Effect of Al Content on Properties of CrFeNiAlxSi High Entropy Alloy. Chinese Journal of Materials Research, 2021, 35(9): 712-720.

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Abstract  

CrFeNiAlxSi high entropy alloys were prepared via laser sintering with Al, Cr, Fe, Ni, Si and natural ferrochrome ore powder as raw materials. The effect of Al content on the phase structure, microstructure, density and porosity, microhardness, wear resistance and high temperature oxidation resistance of CrFeNiAlxSi high entropy alloys were investigated. The results show that CrFeNiAlxSi (x=0.2, 0.4, 0.6, 0.8, 1.0) high-entropy alloys composed of BCC+FCC phase. With the increase of Al content, the amount of FCC phase decreases gradually; when x=0.6, the hardness of the alloy reaches 813.3HV and the density of the alloy decreases and the porosity increases; when x=0.2, the density of the alloy is 4.21 g·cm-³ and the porosity is 26.46%; whilst when x=0.6, the wear resistance of the alloy is the best with wear rate of 69.50 mg·cm-²; Furthermore, the high temperature oxidation resistance of the alloy was obviously improved with the increasing Al-content.
Key words:  metallic materials      high entropy-alloy      phase structure      hardness      high temperature oxidation resistance     
Received:  27 September 2020     
ZTFLH:  TG113  
Fund: National Natural Science Foundation of China(51805235);Program for Innovative Research Team in Yingkou Institute of Technology(TD202001);High-level Talents Research Project of Yingkou Institute of Technology(YJRC202014)
About author:  LI Gang, Tel: 13941819785, E-mail: stars2387@vip.sina.com
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Gang LI
Ying WEN
Zhongmin YU
Jian LIU
Zilian XIONG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.402     OR     https://www.cjmr.org/EN/Y2021/V35/I9/712

PowderPurityGranularity/μmType and content of impurities
Fe≥98.35%

C≤0.05%, S≤0.018%, Si≤0.13%, P≤0.019%, O≤0.35%,

Mn≤0.30%, Acid insoluble substance≤0.35%

Al≥99.0%Fe≤0.6%, Si≤0.3%, Cu≤0.05%, N≤0.01%
Cr≥99.5%74Total amount of impurity cations≤0.01%
Ni≥99.5%Total amount of impurity cations≤0.01%
Si≥99.0%Fe≤0.4%, Ca≤0.1%, Al≤0.02%
Table 1  Experimental powder material and parameters (mass fraction, %)
Element typesCrFeNiAlSi
Melting temperature/℃1857153514536601414
Atomic radius/nm0.1250.1241.250.1430.117
Valence electron concentration681034
Electronegativity1.661.831.911.611.90
Table 2  Basic Physical Parameters of Elements
Element typesCrFeNiAlSi
Cr--1-7-10-37
Fe---2-11-35
Ni----22-40
Al-----19
Si-----
Table 3  Enthalpy of mixing between alloying elements (kJ/mol)
Mole content

ΔSconf

/J·(K·mol)-1

ΔHmix

/kJ·mol-1

δ

/%

ΔχVEC
0.21.512-30.4754.3930.10846.808
0.41.565-30.2695.3730.11406.629
0.61.591-29.9766.0420.11836.466
0.81.605-29.7276.5310.12156.325
1.01.609-29.4406.8840.12426.200
Table 4  Phase stability parameters of CrFeNiAlxSi high entropy alloy
Fig.1  XRD curves of CrFeNiAlxSi high-entropy alloy
CrFeNiAl0.2SiCrFeNiAl0.4SiCrFeNiAl0.6SiCrFeNiAl0.8SiCrFeNiAl1.0Si
BCC43.1747.9554.6469.6275.71
FCC56.8352.0545.3630.3824.29
Table 5  Phase volume fraction of CrFeNiAlxSi high entropy alloy (volume fraction, %)
Fig.2  Microstructure of CrFeNiAlxSi high-entropy alloy (a) x=0.2, (b) x=0.4, (c) x=0.6, (d) x=0.8, (e) x=1.0
Fig.3  Microscopic morphology of CrFeNiAlSi alloy under SEM
ZoneCrystal structureAlCrFeNiSi
Nominal content-2020202020
ABCC30.2030.698.3020.4810.33
BBCC28.5131.919.3720.0910.12
CFCC11.528.8531.8429.7718.02
Table 6  Element content in different zone of CrFeNiAlSi alloy (atomic fraction, %)
Fig.4  Density and porosity of CrFeNiAlxSi high-entropy alloy
Fig.5  Microhardness and wear rate of CrFeNiAlxSi high-entropy alloy
Fig.6  Wear microstructure of CrFeNiAlxSi high-entropy alloy (a) x=0.2, (b) x=0.6, (c) x=1.0
Fig.7  Weight gain per unit mass of CrFeNiAlxSi alloy in 800℃
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