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在1150℃原位热压烧结Ti_3AlC_2和Cu生成亚微米颗粒TiC_(0.67)增强Cu(Al)复合材料,研究了其在20~800℃温度下的压缩特性,并研究了复合材料的杨氏模量和阻尼系数Q-1随温度的变化。结果表明,由于亚微米TiC_(0.67)相与Cu(Al)相的强界面结合,复合材料显示出高的σ_(0.2)值和最终压缩强度。在20和200℃温度下,其σ0.2分别为770和700 MPa,而最终压缩强度更是分别达到了1.18和1 GPa。塑性变形发生在Cu(Al)基体中。在变形表面观察到大量波状滑移线存在,预示着交叉滑移可能为占主导地位的变形机制。复合材料的杨氏模量在室温下为(189±1)GPa,随着温度的升高而降低。阻尼曲线结果显示材料的粘弹性转折出现在300℃。
The TiC_ (0.67) reinforced Cu (Al) composite was produced by in-situ hot-pressing Ti3AlC_2 and Cu at 1150 ℃. The compressive properties of the composites at 20 ~ 800 ℃ were studied. The Young’s modulus Quantity and damping coefficient Q-1 with temperature changes. The results show that the composites show high σ_ (0.2) value and ultimate compressive strength due to the strong interfacial bonding between the submicron TiC_ (0.67) phase and the Cu (Al) phase. At temperatures of 20 and 200 ℃, the σ0.2 values were 770 and 700 MPa, respectively, while the ultimate compressive strength reached 1.18 and 1 GPa respectively. Plastic deformation occurs in the Cu (Al) matrix. The presence of a large number of wavy slip lines on the deformed surface indicates that cross-slip may be the dominant deformation mechanism. The Young’s modulus of the composites is (189 ± 1) GPa at room temperature, decreasing with increasing temperature. Damping curve results show that the viscoelastic transition of the material appears at 300 ℃.