Abstract
The effects of Sn and Mo alloying elements on the microstructure and electrochemical properties of TiZrTaNb high entropy alloys were studied by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemistry. TiZrTaNb, TiZrTaNbMo and TiZrTaNbSn alloys with equal atomic ratio were prepared by the arc melting method. The results showed that the microstructure of the high entropy alloys was dendritic structure with single BCC structure. The addition of Mo and Sn elements promoted the growth of the dendritic structure and accelerated the interdendritic segregation of the TiZrTaNb alloy. The TiZrTaNbMo alloy exhibited excellent corrosion properties compared to TiZrTaNb and TiZrTaNbSn alloys based on corrosion parameters Icorr, φcorr, Ipass. The corrosion mechanism is discussed based on the corrosion morphology. The alloying elements have an important effect on the microstructure and electrochemical properties of a high entropy alloy.
Highlights
A high entropy alloy is a new alloy proposed at the beginning of this century [1,2,3]
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The distribution of Ti, Zr, Nb, Ta in TiZrTaNbMo alloy was similar with TiZrTaNb alloy, while the Mo element Nwba,sTdaisitnriTbiuZtreTdaNasbdMenodarliltoeyaws ashsoswimnilianr FwigituhreTi2Zcr,dTa
Summary
A high entropy alloy is a new alloy proposed at the beginning of this century [1,2,3]. Previous studies have shown that the elastic modulus of a high-entropy alloy with BCC structure is low, which can achieve a better match with the human body and is more suitable for implantation materials [12,13,14]. The mechanical properties were improved after the addition of Mo element, which showed better biocompatibility than pure titanium and stainless steel [16,17,18]. The effect of elements can affect the mechanical properties, and the electrochemical property which is a key parameter for biological materials [19,20,21].
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