铜基复合粉末高压扭转成形组织性能研究

Microstructures and Properties of Copper-based Alloy Fabricated by High-Pressure Torsion

目的研究压力和成形温度对材料强度及塑性的影响。方法将按照合金配方调配好的铜铝混合粉末,置于限制型高压扭转模具型腔中,进行大塑性变形,采用金相显微镜分析了压力和扭转圈数对所制备的试样显微组织的影响,并对制备试样进行了室温拉伸力学性能测试。结果提高压力和成形温度,即使扭转圈数较少也可以获得细化均匀的显微组织,可以获得拉伸断裂强度较大的材料;材料断裂机理为混合断裂。结论高压扭转法可以制备抗拉强度较大的铜基合金试样。

Objective To study the effects of pressure and forming temperature on the strength and plasticity of the material. Methods Copper power and aluminum power were mixed according to the alloy formulation and placed into the restricted high-pressure torsion mold to form biscuit samples by severe plastic deformation. The effects of the pressure and the reversing laps on the microstructure of the prepared samples were analyzed using metallography microscopy. Results The experimental results showed that increasing pressure and forming temperature could achieve material with good micro- structure and greater breaking strength, even when the reversing lap number was low. The fracture mechanism was the mixed fracture. Conclusion Copper-based alloy samples with high tensile strength could be prepared using the high-pres- sure torsion technology.