中文摘要：

采用室温拉伸试验和冲击试验方法,对TC4钛合金分别进行940、960、980℃退火,并在980℃退火后采取不同的冷却方式得到的试样进行强度（σb、σ0.2）,塑性（δ、ψ）和冲击韧性（ak）的测试,结合扫描电镜进行组织和形貌观察,得到了在相变点以下退火温度和冷却速率变化时,TC4钛合金的组织、强度、塑性和冲击韧性的变化规律：随着退火温度的升高,材料的强度、塑性和冲击韧性呈降低趋势;随着冷却速度的加快,材料的强度呈升高趋势,塑性和冲击韧性呈下降趋势。

英文摘要：

The strength（σb, σ0.2）, ductility（δ, ψ） and impact toughness（ak） of TC4 alloy annealed at 940, 960, 980 °C and cooled at different cooling rates after 980 °C annealing were tested by tensile tests at room temperature and impact tests at room temperature. Combined with metallography and fractography, the influence of annealing temperature and cooling rate were studied. The results show that the strength, ductility and impact toughness decrease with the increasing of annealing temperature; however, the strength increases, but the ductility and impact toughness decrease with the increasing of cooling rate.