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- 2019
搅拌铸造法制备短碳纤维/AZ91复合材料的组织与性能
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Abstract:
采用搅拌铸造法制备了不同体积分数（10vol%、15vol%、20vol%）的短碳纤维增强镁基（CFs/AZ91）复合材料，并选取了三个挤压比和两个挤压温度对其进行热挤压变形，采用光学显微镜（OM）、SEM和TEM对CFs/AZ91复合材料的显微组织进行了观察，并测试其室温力学性能及阻尼性能。研究结果表明，热挤压能够有效降低CFs/AZ91复合材料气孔率；在热挤压过程中，纤维沿挤压方向定向排列，同时基体发生动态再结晶。随着挤压温度及挤压比的增大，晶粒呈现等轴状，组织更加均匀。CFs/AZ91复合材料经过挤压后，其力学性能得到提高，屈服强度和抗拉强度随挤压比和CFs体积分数的增大而增大，然而CFs纤维在热挤压后发生明显断裂，限制了挤压态复合材料强度的进一步提升。低温低挤压比条件下，CFs/AZ91复合材料具有较好的阻尼性能，随着挤压比及挤压温度的升高，CFs/AZ91复合材料室温及高温阻尼性能均有所降低。 The short carbon fiber (CFs) reinforced AZ91 Mg matrix composites with different CFs volume fractions (10vol%, 15vol%, 20vol%) were fabricated by stir-casting method. The cast CFs/AZ91 composites were extruded into bars with three different extrusion ratios at 250℃ and 350℃, respectively. During the hot extrusion, grains of the AZ91 matrix are refined due to the dynamic recrystallizaiton while the CFs distribute parallel to the extrusion direction. With increasing of the extrusion temperature and extrusion ratio, the porosity ratio of the CFs/AZ91 composites is reduced effectively and the recrystalled grains grow up accompanied by the improvement of the microstructure homogeneity. The tensile properties of CFs/AZ91 composites are improved due to the improved microstructure whereas the fiber fractures obviously during extrusion, which will restrict the further improvement of the mechanical properties. The CFs/AZ91 composite extruded with small extrusion ratio at lower temperature has better damping capabilities than those of the composites extruded with high extrusion ratio and higher temperature. 国家自然科学基金（51201006；51071057
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