异质纳米结构金属强化韧化机理研究进展

卢磊, 赵怀智

Progress in Strengthening and Toughening Mechanisms of Heterogeneous Nanostructured Metals

LU Lei, ZHAO Huaizhi

图5 断裂试样在DPD Cu样品中的取样方式示意图,不同取向试样的裂纹扩展阻力(J-R)曲线,及裂纹扩展过程示意图[16]

Fig.5 Schematic illustration of the CT specimens and their orientations, J-integral resistance(J-R) curves, and schematic illustrations of the failure process for the DPD Cu samples[16] (CT—compact tension) (a) schematic illustration of the CT specimens and their orientations in the DPD disc. The CT specimens were labeled with two-letter codes based on the crack plane orientation and crack growth direction with respect to the TBs inside the NTBs, i.e., parallel (P), normal (N), and 45° inclined (I) to the TBs, respectively; i.e., P-P, N-N, I-I and N-P, where the first letter designates the orientation of the expected crack plane with respect to the TBs, while the second letter designates the crack propagation direction with respect to the TBs (b) J-R curves (c-f) schematic illustration of the failure process under different cracking orientations (The insert SEM image in Fig.5e shows a micro-crack (indicated by the white arrow) initiated at the NT/NG interface)