形变与热处理对Y2O3/Al2O3/Cu复合材料组织和性能的影响

通过对0.3%Y2O3/0.3%Al2O3/Cu复合材料冷拉拔以及随后的退火工艺,研究了形变及热处理对材料力学性能、导电性能及其组织结构的影响规律。结果表明,随着冷拉拔变形量的增加,0.3%Y2O3/0.3%Al2O3/Cu复合材料的等轴晶粒逐渐沿其变形方向被拉长,材料的抗拉强度增加,导电率下降。变形量为70%时抗拉强度达到峰值,进一步形变后材料出现加工软化。随退火温度的升高,材料的导电率提高,显微硬度下降。显微组织中重新生成无畸变的等轴晶粒。退火后材料力学性能得到改善,断口形貌呈现出大而深的韧窝组织与撕裂棱。

Effects of Thermo-mechanical Heat Treatment Processing on Microstructures and Properties of Y2O3/Al2O3/Cu Composite

The effects of thermo-mechanical heat treatment processing on microstructures and properties of the 0.3%Y2O3/Al2O3/Cu composite were studied. The composite was cold worked, followed by annealing treatments. Results show that as the cold drawing deformation increases, the equiaxed grains is elongated gradually along the direction of the deformation, the tensile strength of the material increases, and the electrical conductivity decreases. When the deformation rises to 70%, the tensile strength reaches a peak, after that the deformation softening begins. With the increase of annealing tempera~tre, the conductivity increases, the micro-hardness decreases and the equiaxed grains rebuild. After the annealing treatment, the properties of the material improve. The fracture morphology shows large and deep dimples and tear ridges.