Crack healing in metallic materials has significant economic, ecological, and social benefits. However, the morphological evolution and mechanism of crack healing have no clear consensus. Therefore, in this study, isothermal heat treatment was applied to heal internal cracks at temperatures of 900 °C to 1200 °C for 15 to 120 minutes. Subsequently, microhardness and tensile tests were performed on the specimen to evaluate the reliability of the healed specimens. The results show that the morphology evolution in crack healing can be divided into three stages. Both atomic diffusion and recrystallization dominate crack healing. Atomic diffusion and recrystallization work together to heal cracks in the first stage. Atomic diffusion allows the recrystallization of materials, and recrystallization accelerates the processes of atomic diffusion. In the second and third stages, atomic diffusion controls crack healing on its own. In addition, with increasing healing time, the ultimate tensile strength and microhardness of the crack healing zone decrease due to the difference in the healing mechanism.

金属材料的裂纹修复具有显着的经济、生态和社会效益。然而，裂纹愈合的形态演变和机理尚无明确共识。因此，在本研究中，采用等温热处理在 900 °C 至 1200 °C 的温度下进行 15 至 120 分钟的内部裂纹愈合。随后，对试样进行显微硬度和拉伸试验，以评估愈合试样的可靠性。结果表明，裂纹愈合的形貌演变可分为三个阶段。原子扩散和再结晶均主导裂纹愈合。原子扩散和再结晶共同作用以修复第一阶段的裂纹。原子扩散允许材料再结晶，再结晶加速原子扩散过程。在第二和第三阶段，原子扩散自行控制裂纹愈合。此外，随着愈合时间的增加，裂纹愈合区的极限抗拉强度和显微硬度由于愈合机制的不同而降低。