Elastic-modulus enhancement during room-temperature aging and its suppression in metastable Ti–Nb-Based alloys with low body-centered cubic phase stability

Mechanism of {332}<113> Twinning Formation in Cold-Rolled Ti-Nb-Ta-Zr-O Alloy

“…Based on the equations reported by Wang et al [1] and given the anisotropy of materials, the values of the elastic constant and shear modulus correspond to E {332} = −0.126 GPa and G {332} = 0.063 GPa, respectively. Additionally, the results correspond to anomalous data when compared with results obtained by Tane et al [44]. Given the isotropy of materials, the shear modulus and elastic modulus correspond to G {332} = 29.6 GPa and E {332} = 0.18 GPa, respectively, and the results are consistent with those obtained in previous studies [44,45].…”

“…Additionally, the results correspond to anomalous data when compared with results obtained by Tane et al [44]. Given the isotropy of materials, the shear modulus and elastic modulus correspond to G {332} = 29.6 GPa and E {332} = 0.18 GPa, respectively, and the results are consistent with those obtained in previous studies [44,45]. Given the low shear modulus on {332} plane, we used the shear-shuffle mechanism for {332}<113> twinning (Kawabata et al [12] model) to calculate the deformation.…”

“…Thus, the formation mechanism for the variants of {332}<113> twinning with low deformation energy corresponds to the shear-shuffle model and those with a high value correspond to the α"-assisted model. Among all the models of {332}<113> twinning formation, only Kawabata et al [12] and α"-assisted twinning models are adequately consistent with the results obtained in previous studies (such as Tane et al [4,44], Kawabata et al [12], Yao et al [13], Hanada et al [17], Talling et al [53], Morris Jr [57], and Takesue [58]) via the analysis of deformation energy based on the Hall-Petch-type relation. Moreover, Bishop et al [64] proposed that the sum of the absolute values of a physically possible set of shears producing a given strain is less than that of a set which is only geometrically possible, and the model of Kawabata et al [12] is well consistent with it.…”

Microstructure and selected mechanical properties of aged Ti-15Zr-based alloys for biomedical applications

“…Aging is an industrially applied heat treatment in Ti-based alloys which improves their mechanical strength through secondary phase precipitation [2,17,18]. β-type Ti-based alloys exhibited α-phase precipitation along the β-phase matrix when submitted to aging treatments, which results in high mechanical and fatigue strength [19,20]. Tane et al [20] obtained an enhancement in the elastic components (bulk and shear modulus) of metastable β-type Ti-Nb-based alloys after room temperature aging, which resulted in interesting properties for biomedical applications.…”

“…β-type Ti-based alloys exhibited α-phase precipitation along the β-phase matrix when submitted to aging treatments, which results in high mechanical and fatigue strength [19,20]. Tane et al [20] obtained an enhancement in the elastic components (bulk and shear modulus) of metastable β-type Ti-Nb-based alloys after room temperature aging, which resulted in interesting properties for biomedical applications. Li et al [21] studied the effect of aging treatment in Ti-Nb-Zr-based alloys, obtaining improvements in the superelastic and mechanical properties of the alloy for use as metallic implants.…”