基于加工图的Al-9.0Mg-0.5Mn-0.1Ti合金的热变形行为（英文）

发布时间：2018-04-14 06:12

本文选题：喷射成形 + Al-.Mg-.Mn-.Ti合金　；参考：《Transactions of Nonferrous Metals Society of China》2017年02期

【摘要】：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%。
[Abstract]:The rheological stress behavior of spray formed Al-9.0Mg-0.5Mn-0.1Ti alloy extruded billet under different deformation conditions (deformation temperature 300 ~ 450 掳C, strain rate 0.01 ~ 10 s ~ (-1)) was studied by isothermal compression test.Based on the dynamic material model, 2D machining diagram and 3D power dissipation diagram were established to analyze the rheological instability zone of the alloy and to optimize the hot deformation process parameters of the alloy.The results show that when the strain is 0.4, the alloy deforms under the condition of 300 掳C ~ (-1) / s ~ (-1), the energy dissipation efficiency factor 畏 is the smallest, the main softening mechanism is dynamic recovery, and the grain is flat.Large angle grain boundary (15 掳) is about 34%. When the alloy is deformed at 400 掳C ~ (1) 0.1 s ~ (-1), the energy dissipation efficiency factor 畏 is the largest. The main softening mechanism of the alloy is dynamic recrystallization, and the microstructure is completely recrystallized, the main softening mechanism of the alloy is dynamic recrystallization, and the microstructure of the alloy is completely recrystallized.The large angle grain boundary (15 掳)) accounts for 86.5%. 2D machining diagram and 3D power dissipation diagram show that the optimum deformation conditions for spray forming Al-9.0Mg-0.5Mn-0.1Ti alloy extruded billet are as follows: deformation temperature 340 ~ 450 掳C, strain rate 0.01 ~ 0.1 s-1 ~ (-1), energy dissipation coefficient 38 ~ (43).
【作者单位】：湖南工业大学冶金与材料工程学院;湖南大学喷射沉积技术及应用湖南省重点实验室;湖南大学材料科学与工程学院;
【基金】：Project(51301065)supported by the National Natural Science Foundation of China Project(15B063)supported by the Youth Research Foundation of Education Bureau of Hunan Province,China
【分类号】：TG146.21

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