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采用热模拟系统研究了半固态变形温度,应变速率和变形量对Ti14合金压缩行为和组织演变的影响。结果表明:温度和应变对Ti14合金半固态峰值应力影响较大,峰值应力随着温度的增加和应变速率的减小而降低。分析认为:半固态变形中,应变速率的变化会影响产生压缩变形所需的响应时间,而液相的含量受控于变形温度,随着变形温度的升高,组织中出现了网状晶界结构,使得变形机制由固相粒子的塑性变形转变为固液混合流动。此外,变形量对合金半固态变形的应力-应变影响较小,可以认为是液相的润滑作用和协调变形机制缓解了晶粒间的压缩应力和摩擦力,使得应力-应变变化不明显。
The effects of deformation temperature, strain rate and deformation on the compression behavior and microstructure evolution of Ti14 alloy were studied by using the thermal simulation system. The results show that temperature and strain have a significant influence on the semi-solid peak stress of Ti14 alloy, and the peak stress decreases with the increase of temperature and strain rate. The analysis shows that: in semi-solid deformation, the change of strain rate will affect the response time needed to produce compressive deformation, while the content of liquid phase is controlled by the deformation temperature. With the increase of deformation temperature, the reticular grain boundaries Structure, making the deformation mechanism from the plastic deformation of solid particles into solid-liquid mixed flow. In addition, the amount of deformation has little effect on the stress-strain of the semi-solid deformation of the alloy, which can be considered as the lubrication of the liquid phase and the coordination deformation mechanism to ease the compressive stress and friction between the grains, so that the stress-strain change is not obvious.