“…The chemical composition of Ti–6Al–3Nb–2Zr–1Mo titanium alloy is (in wt-%): Al-6.3, Nb-3.1, Zr-2.1, Mo-1.0 and balanced by Ti. The comparison of Ti6321 titanium alloy and Ti-6Al-4V alloy are shown in Table 1 [22-25,28-30]. Figure 1 Duplex structure of Ti6321 titanium alloy.…”
Section: Methodsmentioning
confidence: 99%
“…The result found that tensile deformation was very uniform at an initial strain rate of 10 −3 s −1 at 100°C and 300°C, but premature fracture occurred with compressing. In addition to this, the existence and importance of tensile and compressive asymmetries have also been mentioned in the literatures [23-27].…”
To investigate mechanical properties of Ti6321 titanium alloy, tensile tests at different strain rates are carried out. The changes of microstructure and properties at the range of 10−3 s−1–105 s−1 have been studied. Lower density and larger size of dimples produce when stretched at high strain rates of 103 s−1 compared to quasi-static stretching. The yield strengths of the alloy are 805, 1096 and 2440 MPa at strain rates of 10−3 s−1, 2 × 103 s−1 and 105 s−1, respectively with obvious strain rate strengthening effect. At 105 s−1 strain rate, parallel twins generate at grain boundaries to coordinate the deformation when dislocations cannot meet indicating the twinning mechanism comes into play.
“…The chemical composition of Ti–6Al–3Nb–2Zr–1Mo titanium alloy is (in wt-%): Al-6.3, Nb-3.1, Zr-2.1, Mo-1.0 and balanced by Ti. The comparison of Ti6321 titanium alloy and Ti-6Al-4V alloy are shown in Table 1 [22-25,28-30]. Figure 1 Duplex structure of Ti6321 titanium alloy.…”
Section: Methodsmentioning
confidence: 99%
“…The result found that tensile deformation was very uniform at an initial strain rate of 10 −3 s −1 at 100°C and 300°C, but premature fracture occurred with compressing. In addition to this, the existence and importance of tensile and compressive asymmetries have also been mentioned in the literatures [23-27].…”
To investigate mechanical properties of Ti6321 titanium alloy, tensile tests at different strain rates are carried out. The changes of microstructure and properties at the range of 10−3 s−1–105 s−1 have been studied. Lower density and larger size of dimples produce when stretched at high strain rates of 103 s−1 compared to quasi-static stretching. The yield strengths of the alloy are 805, 1096 and 2440 MPa at strain rates of 10−3 s−1, 2 × 103 s−1 and 105 s−1, respectively with obvious strain rate strengthening effect. At 105 s−1 strain rate, parallel twins generate at grain boundaries to coordinate the deformation when dislocations cannot meet indicating the twinning mechanism comes into play.
“…[ 50 ] The deformation path also affects both the triggering stress and the yield stress of metastable β Ti‐alloys due to the asymmetry of deformation‐induced martensite formation. [ 49,51 ] For example, the values of 268 MPa under tension and 203 MPa under compression were reported for an annealed Ti–10V–2Fe–3Al alloy consisting of β phase only. [ 49 ]…”
Section: Fundamentals Of the β‐To‐α" Martensitic Transformationmentioning
confidence: 99%
“…[50] The deformation path also affects both the triggering stress and the yield stress of metastable β Ti-alloys due to the asymmetry of deformation-induced martensite formation. [49,51] For example, the values of 268 MPa under tension and 203 MPa under compression were reported for an annealed Ti-10V-2Fe-3Al alloy consisting of β phase only. [49] Martensite transformation starts in the elastoplastic transition region (Region II in Figure 3c,d) and dominates until the second yield point (Figure 3b).…”
Fundamentals of the β-to-α" Martensitic TransformationCompositions of all alloys in this review are given in wt%, with exception of Ti-Nb-based alloys, which are given in at%. Exceptions from this convention will be explicitly stated.
“…[4][5][6][7][8][9][10] In addition, the formation of a hierarchical microstructure in which secondary and ternary deformation products of fine-scale develop within deformation products of a coarser scale has been reported both in compression and tension. [11][12][13][14] Several studies have explicated the correlation between the activation of different deformation mechanisms under applied forces and the influence of a range of factors, including temperature, the orientation of the parent phase, β-phase stability, β-domain size, and strain rate. [1,15,16] In a multicomponent metastable-β Ti alloy, the β-phase stability is approximated by the molybdenum equivalency (Mo Eq ) which is the sum of the weighted quantities of the elements in the alloy presented in wt%.…”
A Ti‐10V‐3Al‐3Fe metastable β Ti alloy is strained under three‐point bending conditions according to the ASTM E290‐14 standard. A combination of electron backscatter diffraction (EBSD) mapping and high‐resolution scanning transmission electron microscopy (STEM) is used to investigate the microstructural response to flexural stress. Results reveal a delayed formation of the deformation products, due to the load‐bearing capacity of the constituent voids. The deformation products are confined in narrow bands on either side of the fracture surface. {332}⟨113⟩ twinning system is identified as the primary deformation mode followed by the formation of α″ martensite both in β matrix and β twins. Accommodation of the microscopic strain arising from the development of α″ structure and β‐twinning triggers the formation of fine deformation‐induced ω plates, which are observed predominantly at the interfacial plane of β/β
twin and β/α″, and also in the interior of the β twins.
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