航空材料学报2025，Vol.45Issue(2)：53-65,13.DOI:10.11868/j.issn.1005-5053.2023.000216
团簇式设计600℃/856 MPa级Ti-Al-Sn-Zr-Mo-Nb-Ta-W-Si铸态高温钛合金
600℃/856 MPa Ti-Al-Sn-Zr-Mo-Nb-Ta-W-Si as-cast high-temperature titanium alloy designed from cluster formula
摘要
Abstract
Near-α high-temperature titanium alloys typically exhibit poor tensile strengths,falling below 1200 MPa at room temperature and 750 MPa at 600℃.On the basis of the cluster formula α-{[Al-Ti12](AlTi2)}12+β-{[Al-Ti14](Mo0.08Si0.4Nb0.1Ta0.32 W0.14Sn0.96Zr1)}5 of Ti65 alloy,this work partly replaces the elements in the β-Ti structures unit and adds Zr instead of Ti to enhance high-temperature stability of β phase.Consequently,the composition formulas of α-{[Al-Ti12](AlTi2)}x+β-{[Al-Ti13Zr1](Mo0.125Si0.5Nb0.125Ta0.5W0.25Sn0.5Zr1)}(17-x)(x=11,12,13 and 14)series alloys are designed by changing the ratio of α and β cluster unit.The as-cast structure of series alloys is in the form of a basket-weave composed of α plates and residual β phase.As the number of β clusters increases,α plates become increasingly finer,and the tensile strength gradually increases.Among them,the room-temperature tensile strength of Ti-5.3Al-2.5Sn-7.6Zr-0.5Mo-0.5Nb-3.8Ta-0.6Si-1.9W(x=11)reaches 1334 MPa,28%and 21%more than the reported forged IMI834 and as-cast Ti65 alloys.However,the elongation of this alloy is only 1.3%,which is lower than that of forged IMI834 and as-cast Ti65 alloys.The tensile strength is 856 MPa at 600℃,26%and 37%more than forged IMI834 and as-cast Ti65 alloys with the identical elongation.关键词
钛合金/团簇加连接原子模型/成分设计/显微组织/力学性能Key words
titanium alloy/cluster-plus-glue-atom model/composition design/microstructure/mechanical property分类
航空航天引用本文复制引用
黄晓宁,王岑阳,朱智浩,刘田雨,董闯..团簇式设计600℃/856 MPa级Ti-Al-Sn-Zr-Mo-Nb-Ta-W-Si铸态高温钛合金[J].航空材料学报,2025,45(2):53-65,13.基金项目
沈阳市自然科学基金(22315605) （22315605）
