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采用拉伸试验、金相显微镜、扫描电子显微镜对复合铸造法制备的16Mn/Zn复合材料界面层组织和性能进行了研究。研究结果表明:16Mn/Zn复合材料的强度介于锌和16Mn钢之间;受纵向拉伸的条件下,16Mn/Zn复合材料中的微裂纹首先在靠近钢一侧的界面层处萌生,并随载荷增加,微裂纹逐向锌基体扩展,与外加应力相垂直的主裂纹联接成大裂纹,最终导致锌断裂,之后应力由16Mn钢单独承载直至断裂;16Mn/Zn复合材料的纵向拉伸断口分为韧性断裂(16Mn钢)和脆性断裂(界面和锌)。
Tensile test, metallographic microscope and scanning electron microscope were used to study the microstructure and properties of interfacial layer of 16Mn / Zn composite prepared by compound casting. The results show that the strength of 16Mn / Zn composites is between that of zinc and 16Mn steel. The microcracks in 16Mn / Zn composites are first sprouted at the interfacial layer close to the steel under the condition of longitudinal stretching With the increase of load, the microcracks extend from the matrix toward the zinc matrix, and the main cracks perpendicular to the applied stress are coupled into large cracks, eventually leading to the zinc fracture. The stress is then carried by the 16Mn steel alone until fracture. The longitudinal tensile fracture of the 16Mn / Zn composite Divided into ductile fracture (16Mn steel) and brittle fracture (interface and zinc).