冷变形及时效对Ti-15Mo-3Al-2.7Nb-0.2Si钛合金组织和性能的影响  

Effects of Cold Deformation and Aging on Microstructure and Properties of Ti-15Mo-3Al-2.7Nb-0.2Si Titanium Alloy

作　　者：单陇红 黎志勇 杨斌 SHAN Longhong;LI Zhiyong;YANG Bin(Intelligent Manufacturing Institute,Guangdong Technology College,Zhaoqing 526100,China)

机构地区：[1]广东理工学院智能制造学院,广东肇庆526100

出　　处：《热加工工艺》2024年第19期116-120,共5页Hot Working Technology

基　　金：广东省普通高校特色创新类项目(2021KTSCX156);广东省普通高校青年创新人才类项目(2021KQNCX128);广东理工学院创新强校工程项目(2020GKJZK007)。

摘　　要：通过金相显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)和电子拉伸试验机等研究了冷变形和时效处理对Ti-15Mo-3Al-2.7Nb-0.2Si钛合金组织和性能的影响。结果表明:合金冷变形过程中没有发生相的转变。随着冷变形量的增加,合金的晶格逐渐向<011>方向旋转。合金冷变形后时效会析出均匀分布的细小针状α相,α相与β基体具有非常良好的共格关系,这有助于合金性能的提升。冷变形时效合金以时效析出强化为主,形变强化为辅。冷变形会促进时效析出,冷变形量越大,时效析出强化效果也越明显。60%冷变形时效处理的合金最大抗拉强度达到了1786 MPa。The effects of cold deformation and aging treatment on themicrostructure and properties of Ti-15Mo-3Al-2.7Nb-0.2Si titanium alloy were investigated by optical microscopy(OM),X-ray diffractometer(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and electronic tensile testing machine.The results show that no phase transition occurs during the cold deformation of the alloy.With the increase of cold deformation,the lattice of the alloy gradually rotates toward the direction of<011>.Ageing after cold deformation of the alloy precipitates uniformly distributed fine needle-likeα-phase,which has a very good co-grid relationship with theβ-matrix,which contributes to the performance of the alloy.Cold-deformation-aged alloys are mainly strengthened by aging precipitation and supplemented by deformation strengthening.Cold deformation can promote aging precipitation,and the larger the cold deformation,the more obvious the ageing precipitation strengthening effect.The ultimate tensile strength of the alloy treated with 60%cold deformation aging reaches 1786 MPa.

关 键 词：Ti-15Mo-3Al-2.7Nb-0.2Si钛合金 冷变形 时效 组织 性能 

分 类 号：TG166.5[金属学及工艺—热处理]