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采用等温热压缩试验研究不同变形条件下(变形温度300~450°C、应变速率0.01~10 s~(-1))喷射成形Al-9.0Mg-0.5Mn-0.1Ti合金挤压坯的流变应力行为,并基于动态材料模型建立2D加工图和3D功率耗散图来分析合金的流变失稳区和优化合金的热变形工艺参数。结果表明,当应变为0.4时,合金在300°C、1 s~(-1)条件下压缩变形,能量耗散效率因子η值最小,主要软化机制为动态回复,晶粒呈扁平状,大角度晶界(>15°)约占34%;合金在400°C、0.1 s~(-1)条件下压缩变形,能量耗散效率因子η值最大,合金的主要软化机制为动态再结晶,组织为完全再结晶组织,大角度晶界(>15°)约占86.5%。2D加工图和3D功率耗散图表明喷射成形Al-9.0Mg-0.5Mn-0.1Ti合金挤压坯的最佳变形条件是:变形温度340~450°C、应变速率0.01~0.1 s~(-1),合金的能量耗散系数38%~43%。
The flow of Al-9.0Mg-0.5Mn-0.1Ti alloy extrusions for jet forming at different deformation conditions (deformation temperature 300-450 ° C and strain rate 0.01-10 s -1) was investigated by isothermal hot compression test The stress-strain behavior and the 2D material and 3D power dissipation diagram were established based on the dynamic material model to analyze the rheological instability zone of the alloy and optimize the thermal deformation process parameters of the alloy. The results show that when the strain is 0.4, the alloy is compressively deformed under the condition of 300 ° C and 1 s -1, the energy dissipation efficiency factor η is the smallest, the main softening mechanism is dynamic recovery, the grains are flat and large The angle grain boundary (> 15 °) accounts for about 34%. The alloy is compressed and deformed under the condition of 400 ° C and 0.1 s -1, the energy dissipation efficiency factor η is the largest. The main softening mechanism of the alloy is dynamic recrystallization, Tissue completely recrystallized tissue, high angle grain boundaries (> 15 °) accounted for about 86.5%. 2D processing and 3D power dissipation diagram shows that the optimal deformation conditions of spray forming Al-9.0Mg-0.5Mn-0.1Ti alloy billet are: deformation temperature 340 ~ 450 ° C, strain rate 0.01 ~ 0.1 s ~ (- 1), the energy dissipation coefficient of the alloy 38% ~ 43%.