New TiTaNbZrMo high-entropy alloys for metallic biomaterials

Abstract

The advantages of high entropy alloy with good comprehensive properties provide a potential opportunity to explore and develop new alloys suitable for human implantation. In this experiment, TiTaNbZrMo high entropy alloy was designed and prepared by alloy design and first principle. The calculation results predict that the phase composition of each high entropy alloy is BCC structure, and the designed high entropy alloy has structural stability; the non-equal atomic ratio TiNbTaZrMo high-entropy alloy has higher ductility than the equal atomic ratio TiNbTaZrMo high-entropy alloy; the B/G, Poisson’s ratio υ and (C 12-C 44) values of Ti30(NbTaZr)60Mo10 alloy are the largest, indicating that the toughness of this alloy is the best, and the Young’s modulus value is the smallest. The experimental results show that the yield strength of Ti30(NbTaZr)60Mo10 alloy is 1132 MPa, the plastic strain is 33%, and the wear resistance and corrosion resistance are good. The potential of Ti30(NbTaZr)60Mo10 in biological field is proved by calculation and experimental test, which provides an important basis for its industrial application in biomedical alloy.

A Review of Biomaterials Based on High-Entropy Alloys

“…From the content of 0.8 for these elements, the double formation of BCC was obtained for bioHEA (MoTa) x NbTiZr [41], with hardness values of 480-510 HV (x = 0.8 and 1). Analyzing the Ti 30 (NbTaZr) 60 Mo 10 [47], we observed that the hardness is 487 HV, close to the values found by Akmal et al [41], although the proportion of each element is different.…”

“…Another four MoNbTaTiZr equimolar HEAs were studied in different works, three of them manufactured by arc melting [13,20,50] and one by induction [47]. For the works by Hua et al [20] and Wang and Xu [50], a hardness of approximately 500 HV was obtained, while for the work of Shittu et al [13] and Li et al [47], higher values were found: 657 and 619 HV, respectively.…”

“…Another four MoNbTaTiZr equimolar HEAs were studied in different works, three of them manufactured by arc melting [13,20,50] and one by induction [47]. For the works by Hua et al [20] and Wang and Xu [50], a hardness of approximately 500 HV was obtained, while for the work of Shittu et al [13] and Li et al [47], higher values were found: 657 and 619 HV, respectively. The reason for this divergence is not clear, but factors such as different grain sizes resulting from different cooling rates and the degree of segregation may be determinant for such different values.…”

Effects of Mn addition on mechanical properties, fracture surface, and electrochemical corrosion resistance of CoCrFeNiAl high-entropy alloys

“…In 2004, Yeh et al [7,8] proposed a method for creating alloys consisting of five to six metallic elements added in equal ratios. Many studies [9][10][11][12][13][14] have shown that the properties of such alloys, referred to as high-entropy alloys (HEAs), are superior to those of conventional alloys since the different atoms are randomly distributed in the atomic layer, which results in a disorderly (i.e., high-entropy) effect and limits the formation of brittle compounds.…”

Enhancing plasticity of ‘self-sharpening’ tungsten high-entropy alloy via tailoring μ-precipitation

“…Among the traditional alloys, only depleted uranium alloys exhibit self-sharpening properties [4], but they have the problem of environmental contamination [5]. Fortunately, a emerging design paradigm of alloys with multiple-principal-element, often termed as high-entropy alloys (HEAs), has presented promising pathways for seeking new and improved alloys within a previously unexplored compositional/phase space [6][7][8][9][10][11][12][13][14][15][16]. Based on the average valence electron concentration strategy, a novel equimolar WMoFeNi high-entropy alloy with excellent self-sharpening properties has been successfully developed in our previous work [3].…”