(1.中国科学院 金属研究所，沈阳材料国家(联合)实验室，沈阳 110016；
2. 沈阳工业大学 材料科学与工程学院，沈阳 110870)
摘 要: 研究室温下固溶处理对热轧态Ti-24Nb-4Zr-8Sn(简称Ti2448)合金在应变控制(R=0.1)下的低周疲劳性能的影响。结果表明：合金经(750℃，30 min)固溶处理后(简称SS)，形成再结晶组织，该组织比热轧态合金的更均匀。与热轧态合金相同，SS合金同样具有超弹性。SS处理后，合金具有较高的低周疲劳寿命，并且在高应变幅下，其低周疲劳性能较热轧态合金的好；而在低应变幅下，其低周疲劳性能比热轧态合金的稍差。XRD分析表明，随着应变幅的增加，α2相的析出含量增大。
关键字: 固溶处理；Ti2448；低周疲劳；超弹性；循环软化
（1. Shenyang National Laboratory for Materials Science, Institute of Metal Research,
Chinese Academy of Science, Shenyang 110016, China;
2. Institute of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China）
Abstract:The studies effects of solid solution treatment on low cycle fatigue (R=0.1) controlled by the strain properties of Ti-24Nb-4Zr-8Sn (Ti2448) alloy at room temperature was investigated. The result shows that the alloy after (750 ℃, 30 min) solid solution treatment (SS), the recrystallization organization forms, which is more uniform than that of the hot rolled state alloy. As the same as the hot rolled state alloy, the SS alloy also has super elasticity. After SS treatment, the alloy has the high life of low cycle fatigue (LCF), and presents higher LCF performance than that of hot rolled alloy at high strain amplitude. However, at low strain amplitude, the LCF performance of SS alloy is a bit poorer than that of hot rolled alloy. XRD analysis shows that with the increase of strain amplitude, the content of α2 precipitation increases.
Key words: solid solution treatment; Ti2448; low cycle fatigue; superelasticity; cyclic softening
