Abstract The prospect of introducing natural biological secrets to improve the crack resistance of gray cast iron is presented. We demonstrated that the mechanism of resisting crack owned by plant leaf can be referred to fabricate an alternating structure of hard and soft with low cost, high strength, and an exceptional ability to resist crack growth. Laser alloying was introduced to fabricate the hard phase which associated with the original matrix constituted the alternating structure. A homogeneous microstructure and a uniform distribution of chemical composites were achieved in hard phase. Nanoindentation test showed the resistance to plastic deformation of hard phase was improved. Crack propagation tests verified the crack resistance was enhanced by the alternating structure which could change and prolong crack path, and the effectiveness of resisting crack propagation was proportional to the size of hard phase.

中文翻译：

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一种提高灰口铸铁抗裂性的仿生概念

摘要 展望了引入天然生物秘密提高灰口铸铁抗裂性的前景。我们证明了植物叶片所具有的抗裂纹机制可以参考以低成本、高强度和优异的抗裂纹扩展能力制造硬软交替结构。引入激光合金化以制造与原始基体相关的硬相，构成交替结构。在硬质相中实现了均匀的微观结构和化学复合材料的均匀分布。纳米压痕试验表明硬质相的抗塑性变形能力有所提高。裂纹扩展试验证实，交替结构可以改变和延长裂纹路径，提高了抗裂纹能力，