采用TiB_2颗粒与铝粉混配的方法,获得利于成形的预制体,采用压力浸渗法制备体积分数为20%的TiB_(2P)/6061Al复合材料,并采用10:1的挤压比对复合材料进行热挤压.利用扫描电镜(SEM)、透射电镜(TEM)和万能电子拉伸机对热挤压前后复合材料的微观组织及力学性能进行研究,发现经过该种方法制备的复合材料经热挤压后具有良好的室温拉伸力学性能,抗拉强度为447.5 MPa,弹性模量为121.8 GPa,延伸率可达7.95 %,显示出良好的强塑性配合,分析其强塑性来源于增强体与基体之间的良好界面结合、晶粒细化强化和沉淀强化.
Based on the easily-formed preform made of the mixture of TiB_2 particles and aluminum powder, 20% TiB_(2P)/6061Al composites (volume fraction) were fabricated by pressure infiltration method;subsequently, the composites were hot extruded with 10:1 extrusion ratio. The microstructures and mechanical properties of the composites before and after hot extrusion were studied with SEM, TEM and a tensile machine. Results show that the composites after hot extrusion exhibit better tensile strength, such as the tensile strength of 447.5 MPa, elastic modulus of 121.8 GPa and large elongation of 7.95 %. The high strength-plasticity for the composites is attributed to the interfacial bonding strength and grain refining strengthening and precipitation strengthening.
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