Dense bone is nearly solid, whereas the porosity of trabecular bone varies between 50 and 90%, and the mechanical properties of the bone vary significantly with age, anatomical location, and bone mass (Lei et al., 2013; Al-Hafidh et al., 2020; Gaffuri et al., 2021). Such complex mechanical property modulation is difficult to attain with a single principal factor alloy, which requires substantial elemental modulation by HEA to satisfy particular bone-implant wants. Such complicated mechanical property modulation is troublesome to realize with a single primary factor alloy, which requires important elemental modulation of HEA to satisfy specific bone-implant wants. Figure 2 shows the construction and primary content of the paper. The second part critiques the composition design theory of Bio-HEAs.
The elements composition of Bio-HEAs has essentially the most crucial impact on its power and ductility. First, alloying components decide the elastic behavior and atomic interactions of Bio-HEA, affecting the energy and ductility of the alloy at the atomic stage. In addition, the ratio of elements can determine the section composition and fraction of Bio-HEAs. In multi-component Bio-HEAs, the type and content material of modulating elements can have a big influence on the mechanical properties of the HEA, and customary component additions embody metallic and non-metallic components . In the corrosion response, corrosion potential , corrosion current density , and AC impedance are important parameters for analyzing the corrosion resistance of the material, and the related parameters of some Bio-HEAs are listed as proven in Table 2. For Bio-HEAs with Ti and Ta parts, their decrease Ecorr signifies that they may each readily form protecting passivation layers (Zheng et al., 2018).
Figure 4a shows the TEM picture of AlCrFeNiV high-entropy alloy, and Figure 4b,c show the corresponding electron diffraction patterns. Figure 4b,c show that the AlCrFeNiV alloy is not just a single body-centered cubic , but a combination of two BCC constructions with completely different lattice constants. It could be seen from the XRD patterns that the powder evolution means of BCC2 is dominated by V element. Moreover, in Figure 4c, there are only a few twins within the electron diffraction. Figure 2 reveals HEA and the columnar accumulation diagram (at.%) of component content within the two phases.
The single-crystal elastic constants describe the relationship between the measured h, k, and l-specific elastic lattice strains, using neutron diffraction and the macroscopic stresses applied to the polycrystalline HEA materials. From an engineering perspective, the multi-component nature of HEAs predestines the strengthening mechanism of HEAs to be equally multidimensional. Current research on HEAs is characterised by quite a few discoveries, intense discussions, and illuminating scientific research questions (Chen X. et al., 2022; Jin et al., 2022).
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