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Effect of Copper Content on Corrosion Resistance and Glass-formingAbility of Novel AlNiZrCoYSi High Entropy Amorphous Alloy
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Zhejiang University, Ocean College

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    Abstract:

    A new type of high entropy amorphous alloy (denoted as HEAA) ribbons Al17.5Ni20Zr17.5Co20Y20Si5 was prepared by injection in copper mould with arc melting. The effect of Cu content on corrosion resistance of the Al17.5Ni20Zr17.5Co20Y20Si5 HEAA was studied mainly by adding Cu element into the alloy. The glass-forming ability and hardness of the alloy were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and microhardness tester, respectively. The corrosion resistance of these ribbons in 3.5 wt.% NaCl corrosive solution at room temperature were investigated by potentiodynamic polarization curves (Tafel) and Nyquist plots. The results show that four kinds of (AlNiZrCo)75-xCuxY20Si5(x=0, 10, 14, 15) near equiatomic HEAA ribbons present typical amorphous diffraction peaks. The Cu content has little effect on the glass-forming ability of the AlNiZrCoYSi HEAA ribbons, but it will reduce the corrosion resistance. The Vickers microhardness of the above alloys is over 470 HV0.1. The corrosion resistance of the Al17.5Ni20Zr17.5Co20Y20Si5 HEAA ribbons is the finest. The corrosion potential (Ecorr) is -0.248 V, the corrosion-current density (icorr) is 1.63 μA / cm2, and the polarization resistance (RP) is 24.56 kΩ.cm2. This material has demanding application potential to solve the problem of anti-corrosion and wear resistance in harsh marine environment.

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[Zhang Shuyan, Zhang Zhibin, Wang Xin, Gao Yangyang, Liang Xiubing, Wang Lizhong. Effect of Copper Content on Corrosion Resistance and Glass-formingAbility of Novel AlNiZrCoYSi High Entropy Amorphous Alloy[J]. Rare Metal Materials and Engineering,2021,50(12):4587~4591.]
DOI:10.12442/j. issn.1002-185X.20210175

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History
  • Received:March 04,2021
  • Revised:March 07,2021
  • Adopted:April 16,2021
  • Online: January 09,2022
  • Published: December 24,2021