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采用P/M法制备了SiC颗粒均匀分布的SiCp/7090Al复合材料坯件,并进行热挤压实验,研究SiC颗粒在热挤压变形过程中的分布特征及运动规律。结果表明:在挤压应力作用下,复合材料挤压棒材中SiC颗粒分布均匀,且沿挤压方向呈定向分布特征;挤压比为11时,挤压棒材中存在一定量合金粉末颗粒的结合界面;提高挤压比至17以上时,合金颗粒结合界面逐渐消除,实现了冶金结合。随着挤压比的增加,室温抗拉强度由挤压比为11时的363 MPa增大到挤压比为39时的493 MPa。
The P / M method was used to prepare a SiCp / 7090Al composite blank with uniform distribution of SiC particles. The hot extrusion test was carried out to study the distribution and movement of SiC particles during hot extrusion. The results show that under the action of compressive stress, the distribution of SiC particles in the extruded bar is uniform and oriented along the extrusion direction. When the extrusion ratio is 11, a certain amount of alloy powder particles Of the bonding interface; improve the extrusion ratio to 17 or more, the alloy particles gradually reduce the bonding interface, to achieve metallurgical bonding. With the increase of extrusion ratio, tensile strength at room temperature increased from 363 MPa at extrusion ratio of 11 to 493 MPa at extrusion ratio of 39.