在课题组前期工作基础上，设计并铜模吸铸了满足α-{[Al-Ti₁₂](AlTi₂)}_{17 - n} + β-{[Al-Ti₁₄](V₂Ti)}_n 团簇式的合金系列，通过改变β相团簇式的个数n，获得组织覆盖α到β的Ti-(3.19~7.45)Al-(0~12.03)V系列合金，进而表征了铸态组织和室温拉伸力学性能。结果表明，随着n增加，铸态组织由单一α (α'马氏体)经双相态直到单相β，α'马氏体形态由板条状逐渐转变为细片状和针状，当n = 5时开始出现β相，n = 8时α'马氏体数量最多且呈针状，当n = 12时α相完全消失，形成单一β相。相应地，合金强度呈先上升而后下降的趋势，塑性变化趋势则相反，这源自细小针状α'马氏体提升强度而降低塑性的作用。当n = 8时，合金的强度达到最大(比Ti-6Al-4V提高了90 MPa)，抗拉强度约为1019 MPa、屈服强度约为867 MPa、延伸率与Ti-6Al-4V持平(约为4%)，尤其是比强度和比硬度均优于Ti-6Al-4V，达到了230 kN·m/kg和0.76 GPa·cm³/g，分别提升了9%和5%。

The dual-cluster composition formula of the widely-used α + β Ti-6Al-4V and α-{[Al-Ti₁₂](AlTi₂)}₁₂ + β-{[Al-Ti₁₄](V₂Ti)}₅, reported in our previous work, indicates that all Ti alloys are composed of α and β units. In this study, Ti-(3.19-7.45)Al-(0-12.03)V (mass fraction, %) alloys are designed following composition formula of [Al-Ti₁₂](AlTi₂)}_{17 - n} + β-{[Al-Ti₁₄](V₂Ti)}_n by changing n value (number of β cluster units). The alloys as prepared by copper mould suction-casting cover microstructures ranging from pure α to pure β. In the as-cast state, as the n value increases, the microstructure changes from single α phase (α' martensite), via α + β dual-phase, and finally to single β phase. The morphology of α' martensite gradually changes from plate-like to lamellar and needle-like. Ti-6Al-4V alloy corresponds to n = 5, where β phase begins to appear. When n = 8, needle-like α' martensite shows the highest content. When n = 12, α phase disappears completely and is replaced by β phase. Correspondingly, the strength of the alloys increases first and then decreases, while the plasticity changes inversely, due to the presence of fine-needle α' martensite. Among all the compositions, Ti-5.28Al-6.14V alloy (n = 8) shows the highest strength (about 90 MPa higher than Ti-6Al-4V), with tensile strength of 1019 MPa, yield strength of 867 MPa. Its specific strength and hardness of 230 kN·m/kg and 0.76 GPa·cm³/g increased by 9% and 5%, respectively, are both superior to Ti-6Al-4V.