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Effects of Y2O3 on the Hot Deformation Behavior and Microstructure Evolution of Al2O3-cu/35Cr3TiB2 Electrical Contact Composites

Materials Characterization(2024)SCI 2区SCI 1区

School of Materials Science and Engineering | Center for Advanced Measurement Science | Department of Mechanical Engineering

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Abstract
The Al2O3-Cu/35Cr3TiB2 and 0.5Y2O3/Al2O3-Cu/35Cr3TiB2 composites were prepared by a combination of fast hot compression sintering and internal oxidization. The effects of Y2O3 on the hot deformation behavior and microstructure evolution of the composites were investigated. According to the hot deformation data, the constitutive equations, hot processing maps, and critical dynamic recrystallization models were constructed for the two composites. The Y2O3 addition enhanced the flow stress, activation energy, and hot processing properties of the composites. This led to a reduction in the percentage of dynamic recrystallization structure from 25.3% to 19.4%, and decreased the amount of high-angle grain boundaries from 77.8% to 71.4%. Y2O3 was distributed at grain boundaries and phase interfaces, effectively impeding dislocation movement and grain boundary migration. Notably, the strain distribution within Y2O3 exhibited greater homogeneity compared to the Cu matrix. More twins and stacking faults were observed inside the 0.5Y2O3/Al2O3-Cu/35Cr3TiB2 composites, which synergistically strengthened the matrix.
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Key words
Copper-based composites,Hot deformation behavior,Dynamic recrystallization,Microstructure evolution
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要点】:研究Y2O3对Al2O3-Cu/35Cr3TiB2电接触复合材料热变形行为及微结构演化的影响,发现Y2O3的添加能提高材料的流动应力、激活能和热加工性能,减少动态再结晶结构和高位角晶界比例。

方法】:通过快速热压烧结和内氧化方法制备Al2O3-Cu/35Cr3TiB2和0.5Y2O3/Al2O3-Cu/35Cr3TiB2复合材料,并利用热变形数据建立本构方程、热加工图谱和临界动态再结晶模型。

实验】:在实验中,研究了两种复合材料的流动应力、激活能和热加工性能,并通过观察Y2O3在晶界和相界面的分布及其对位错运动和晶界迁移的阻碍作用,以及0.5Y2O3/Al2O3-Cu/35Cr3TiB2复合材料中孪晶和层错数量的增加,来分析Y2O3对微结构的影响。具体数据集名称未在文本中提及。