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研究了粗晶纯Al在预疲劳变形后的显微结构和力学性能。结果表明,材料微裂纹晶界处向相邻晶粒发展。大量裂纹的存在使得粗晶纯Al的均匀伸长率和抗拉强度降低。预疲劳后单向拉伸断口形貌主要由剪切唇和纤维区构成,并且断口处存在撕裂痕迹。
The microstructure and mechanical properties of coarse-grained pure Al after pre-fatigue deformation were studied. The results show that the material microcracks grain boundaries to the adjacent grain development. The presence of a large number of cracks reduces the uniform elongation and the tensile strength of coarse-grained pure Al. After pre-fatigue uniaxial tensile fracture morphology is mainly composed of shear lip and fiber zone, and the fracture exists at the tear marks.