原位自生TiB_2颗粒Al-Si-Mg-Cu复合材料的高温流变行为研究

Flow Stress Behavior of In-situ TiB_2/Al-Si-Mg-Cu Composite at High Temperature

针对原位合成TiB2/Al-Si-Mg-Cu复合材料,应用Gleeble-3500热模拟机进行等温压缩试验,研究其在变形温度300～500℃和应变速率10-3～10s-1的热变形行为。结果表明:该复合材料在高温压缩时均存在稳态流变特征,且属于正应变速率敏感材料;在同一变形温度下,应变速率越高,其流变应力越大;在同一应变速率下,变形温度越低,其流变应力越大。

The flow stress behaviors of in-situ synthesized TiB2/Al-Si-Mg-Cu composite were studied on Gleeble-3500 by isothermal compression at 300-500 ℃ and strain rate of 10-3-10 s-1. The results show that the composite has the steady-state flow characteristics. The composite belongs to positive strain rate sensitized materials. At the same temperature, it is found that the flow stress increases with the strain rate increasing. While at the same strain rate, the flow stress increases with the temperature decreasing.