利用Gleeble 3800型热模拟试验机对TC17钛合金在两相区进行了等温恒应变速率的热压缩试验，分析了压缩失稳的变形条件;采用光学显微镜和扫描电子显微镜研究了压缩变形后试样的显微组织。结果表明：TC17钛合金在热变形温度750 ℃、应变速率不小于1 s-1、变形量不小于45%下进行热压缩时，会发生变形失稳；变形失稳后，随变形量和应变速率增加，其失稳区变窄，组织变形不均匀性加剧；失稳区主要是β转变组织变形。

The hot compression test at constant temperature and strain rate was conducted on TC17 titanium alloy in two-phase region using the thermal simulation testing machine Gleeble 3800 and the deformation condition resulted in compression instability was analysed. The microstructure of the TC17 titanium alloy after compression was studied by optical microscope and scanning electron microscope. The results show that the deformation instability of TC17 titanium alloy occurred when the heat distortion temperature was 750 ℃, the strain rate and deformation amount was no less than 1 s-1 and 45% respectively. After deformation instability occurrence, with the increase of the deformation amount and strain rate, the instability zone narrowed and the microstructure deformation inhomogeneity intensified. In the instability zone, the deformation occurred mainly in β transformation microstructure.