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研究了ＴｉＢ２颗粒增强ＺＡ－８锌合金复合材料和基体材料的疲劳裂纹扩展行为与显微组织、断口的关系。结果表明：所研究复合材料的抗疲劳裂纹扩展能力优于基体材料，尤其在小裂纹阶段．其原因为：增强粒子与裂纹尖端的相互作用降低了裂纹尖端的应力强度；增强粒子与基体良好的界面结合力；增强粒子的加入，导致了基体微观组织结构的变化和细化以及增强粒子的桥接（Ｂｒｉｄｇｉｎｇ）作用。最后，探讨了在两种材料中不同的裂纹扩展机理。
The relationship between fatigue crack growth behavior and microstructure and fracture of TiB2 particle reinforced ZA-8 zinc alloy composites and matrix materials was studied. The results show that the fatigue crack growth resistance of the composites studied is superior to that of the matrix materials, especially in the small crack stage. The reason for this is that increasing the interaction between the particles and the crack tip reduces the stress intensity at the tip of the crack, enhancing the good interfacial adhesion between the particles and the matrix, enhancing the addition of the particles, leading to the change and refinement of the microstructure of the matrix, Bridging effect. Finally, different crack propagation mechanisms in the two materials are explored.