钨丝直径对连续锆基非晶复合材料拉伸行为的影响

Effect of Different Diameters of Tungsten Wires on Tensile Mechanical Behaviors of Continuously Manufactured Zr-based Bulk Metallic Glass Composites

通过连续渗流方法制备出钨丝体积分数为62%~66%,钨丝直径分别为40,60,80,150μm的钨丝增强锆基非晶合金复合材料。研究表明,钨丝直径为80μm时,非晶合金复合材料的抗拉伸强度和延伸率分别达到最大值,当钨丝直径增加到150μm时,非晶复合材料的抗拉伸强度和塑性急剧降低。对断口形貌进行了分析。研究发现钨丝增强非晶复合材料中,增强相直径不同引起面体率变化,从而影响非晶和钨丝界面的应力、钨丝在三轴应力状态下的变形和断裂以及非晶基体中剪切带的形成和扩展,最终影响复合材料的拉伸力学性能。

An experimental set-up was designed for measuring the self-field losses of Bi2223/Ag HTS tapes using a transport current method. In this paper, Zr-based metallic glass composite with tungsten wire of 62~66 vol% in different diameters were fabricated by continuous infiltration casting process. Results show that the fracture strength and plastic strain of the metallic glass composite reach peak values at the diameter of tungsten wire of 80 μm. When the diameter of tungsten wire continues to increase to 150 μm, the fracture strength and plastic strain slump for the metallic glass composite. According to the analysis of fracture surfaces of the composites after tensile test,it is concluded that the ratio of surface to volume for different-diameter tungsten wire reinforced composites has an important effect on the tensile mechanical properties of composites through affecting the stress at interface between tungsten wire and metallic glass matrix,deformation and fracturing of tungsten wire and the formation and propagation of shear band in the metallic glass matrix.