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利用Gleeble1500热/力模拟机研究了Ti14合金在应变速率为5×10-1s-1,变形温度1050、1100℃条件下,压缩变形量对合金半固态塑性变形行为和微观组织的影响。分析了合金流变应力与变形量之间的关系,探讨了变形量对合金微观组织尤变形过程中液相分布的影响,计算了不同温度和变形量的液相流动率。结果表明:合金在半固态条件下存在明显屈服现象,变形量的增加引起了流变应力的降低,其中变形量在50%~60%时,流变应力受变形量影响较大,随变形温度增加,变形量对流变应力影响减缓。分析认为:流动率是影响合金半固态流变行为的主要原因,变形量的增加引起了液相流动率的阶段性变化,其中,大变形量使得液相流动率增加,减缓应力集中,表现为较小的流变应力。
The effect of compressive deformation on the semi-solid plastic deformation behavior and microstructure of Ti14 alloy was studied by using Gleeble1500 heat / force simulator at strain rate of 5 × 10-1s-1 and deformation temperature of 1050 and 1100 ℃. The relationship between the flow stress and the deformation of the alloy was analyzed. The influence of the deformation on the distribution of the liquid phase in the deformation of the alloy was discussed. The liquid flow rate at different temperatures and deformations was calculated. The results show that the alloy has obvious yielding under the condition of semi-solid. The increase of deformation causes the decrease of the flow stress. When the deformation is between 50% and 60%, the flow stress is greatly affected by the deformation. With the deformation temperature Increase, the amount of deformation on the impact of flow stress slowed down. The analysis shows that the flow rate is the main factor affecting the semi-solid alloy rheological behavior. The increase of the deformation leads to the phase change of the liquid flow rate, in which the large deformation makes the liquid flow rate increase and slows the concentration of stress Smaller flow stress.