High temperature compression properties of near α type Ti-1100 alloy prepared by titanium hydride based powder metallurgy
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摘要: 以氢化钛粉为原料，采用粉末冶金法-热等静压法制备高温钛合金Ti-1100，并进行了等温压缩试验，通过压缩样品应力应变曲线进行压缩变形行为分析，再结合Arrhenius双曲正弦本构模型建立热压缩本构方程。通过应力应变曲线分析，发现应变速率在0.01 s−1时，所有样品在加工硬化后均表现出稳态流变行为；而应变速率为1 s−1、温度在900 ℃或1 000 ℃时，流变应力随着变形达到稳态流变状态后，呈增加趋势。应变速率为0.01、0.1、1 s−1时的热压缩变形激活能分别为96、165、232 kJ/mol。硬度测试结果表明显微硬度随温度和应变速率增加稍有降低趋势，当温度为950 ℃，应变速率为0.1 s−1时，合金的硬度普遍较小, 热加工性能最佳。Abstract: The isothermal compression experiments were carried out on high temperature titanium alloy Ti-1100 prepared by powder metallurgy using titanium hydride powder as raw material. The compression deformation behavior was analyzed through the obtained stress-strain curve of compressed samples, and then the thermal compression constitutive equation was established by using Arrhenius hyperbolic sinusoidal constitutive model. Through the analysis of the stress-strain curve, it is found out that when the strain rate is 0.01 s−1, all samples show steady-state rheological behavior. When the strain rate is 1 s−1 and the temperature is 900 ℃ or 1 000 ℃, the flow stress increases with deformation after steady-state rheological state. The activation energy of thermal compression deformation for strain rate at 0.01, 0.1 s−1 and 1 s−1 are 96, 165 kJ/mol and 232 kJ/mol, respectively. The hardness test results show that microhardness decreases slightly with increase of temperature and strain rate. When the temperature is 950 ℃ and the strain rate is 0.1 s−1, the hardness of the alloy is generally small and the best hot workability can be achieved.
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图 2 高温压缩样品宏观形貌
Figure 2. Macroscopic morphology of the samples after high temperature compression
图 3 Ti-1100合金在900、950、1000 ℃压缩变形的应力-应变曲线
Figure 3. Flow stress-strain curves of Ti-1100 alloy under compression at 900, 950 and 1 000 ℃
表 1 本构方程参数值
Table 1. The parameters of the constitutive equation obtained
T/K β n1 α n A3 1173 0.02204 3.7964 0.08368 0.26341 0.01274 1223 0.02706 3.16718 0.08572 0.31574 0.10324 1273 0.05829 3.16184 0.1843 0.31627 0.75223 
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