【摘要】 在应变速率为0.001 s^-1、0.005 s^-1、0.01 s^-1，温度为880℃、900℃、920℃、940℃的条件下对TA15钛合金进行了高温拉伸试验，材料在920℃以上、0.005 s^-1以下的延伸率可超过500%，具有优异的超塑性能。计算了TA15钛合金的本构方程及在应变速率为0.005 s^-1时，不同温度下的应变敏感性指数m值和材料常数K值。通过超塑成形/扩散连接（SPF/DB）工艺，采用有限元模拟对双层结构件的壁厚分布进行分析，并获得了气压加载压力–时间曲线。在温度为920℃时，采用预镂空面板制得了局部减重的中空双层结构件，最小壁厚为0.31 mm，采用超声波C扫描对零件的扩散面积进行分析，结果表明，焊合率高于95%。更多还原

【Abstract】 High-temperature tensile tests were performed on TA15 titanium alloy at strain rates of 0.001 s^-1, 0.005 s^-1,0.01 s^-1 and temperatures of 880 ℃, 900 ℃, 920 ℃, 940 ℃. The material exhibits excellent superplasticity with elongation exceeding 500% above 920 ℃ and below 0.005 s^-1. The constitutive equations of TA15 titanium alloy and the strain sensitivity index m and material constant K values at different temperatures with strain rate of 0.005 s^-1 were calculated.Finite element simulations were used to analyze the thickness distribution of the double-layered structural component,and pressure–time curves were obtained. At the temperature of 920 ℃, the hollow double layer structural parts with local weight reduction are made by using pre-hollow panels SPF/DB, the minimum wall thickness is 0.31 mm, the diffusion area of the component was analyzed by ultrasonic C-scan, and the results showed that the bonding ratio is higher than 95%.更多还原