(西安交通大学 金属材料强度国家重点实验室，西安 710049)
摘 要: 采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和显微硬度仪等技术对Ti-1300合金不同热处理工艺的试样进行了观察与表征，研究Ti-1300合金的 相对时效过程中β→α相转变及微观组织与力学性能的影响。结果表明：固溶处理的试样以4 ℃/min的速率加热到350 ℃保温10 min，随后加热到500 ℃保温4 h，析出α相的平均尺寸(长度)为54 nm；而直接在500 ℃保温4 h析出α相的平均尺寸(长度)为202 nm。将固溶后的试样随炉加热(4 ℃/min)到350 ℃，b 相中只有 相析出；加热到400 ℃时，在组织中发现了α相依附w相形核现象，加热到500 ℃保温4 h时， 相消失，合金获得极为细小均匀的a相。时效过程中析出的α相对合金的硬化作用比w相的更为显著。
关键字: Ti-1300合金；时效；w相；α相形核
（State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China）
Abstract:The microstructures of the aged samples after solution treatment with different aging treatments were observed and characterized by SEM, TEM and XRD. The effects of ω phase on the β→α phase transformation and microstructures on Ti-1300 alloy were also studied. The results show that the average size (length) of precipitated α phase is 54 nm after being heated at 350 ℃ for 10 min and then being heated at 500 ℃ for 4 h. The average size (length) of the α phase is 202 nm when the sample is directly held at 500 ℃ for 4 h. Only nanoscale w phase were observed in the sample being heated to 350 ℃ at the rate of 4 ℃/min, while α phase nucleation attached to w phase was observed in the sample which is heated to 400 ℃. When the sample is heated continuously to 500 ℃ and held for 4 h, w phase disappeared and very fine uniform α precipitates are obtained in the microstructure. The hardening effect of α phase is stronger than that of w phase.
Key words: Ti-1300 alloy; aging; w phase; α phase precipitation
