反挤压对SiCw/6061力学性能影响的实验研究

以挤压工艺对SiCw/6061复合材料力学性能的影响为研究目标,通过改变挤压温度、挤压比以及凸模中心锥角等工艺参数,系统分析了挤压铸造制备的SiCw/6061复合材料反挤压变形前后强度、塑性及硬度的变化规律.研究表明,挤压变形可以有效地提升复合材料试件的各项力学性能指标;随着挤压温度的升高,试件的屈服强度、抗拉强度均呈现升高的变化趋势,延伸率先显著增大而后略有减小,硬度则呈现下降的趋势;随着挤压比的增加,试件的强度、塑性及硬度均呈现上升趋势;随着凸模中心锥角的增大,试件的屈服强度、抗拉强度均呈现先升高后下降的趋势,延伸率及硬度则随着锥角的增加始终呈上升趋势.

Experimental research of the influence of backward extrusion on the mechanical properties of SiCw/6061 composite

To analyze the effect of backward extrusion on the mechanical properties of SiCw/6061 composite fabricated by squeeze casting technique, the strength, the plasticity and the hardness of the deformed components under different extrusion temperatures, extrusion ratio and extrusion male die cone angle are presented and discussed here. The experimental results show that extrusion deformation is capable of enhancing the mechanical properties of the components. With the increase of extrusion temperature, the yield strength and tensile strength of the components are being increased simultaneously, and the elongation is increased obviously at the beginning and then decreased slightly, and the hardness is decreased constantly. With the increase of extrusion ratio, the strength, plasticity and hardness of components are increased jointly. With the increase of male die cone angle, the yield strength and tensile strength are increased firstly and then decreased although the elongation and hardness are increased constantly.