论文标题
Al/SIC纳米胺的骨折韧性的纳米力学表征
Nanomechanical characterization of the fracture toughness of Al/SiC nanolaminates
论文作者
论文摘要
Al/SIC纳米胺的断裂韧性具有不同的层厚度（在10至100 nm的范围内），通过微骨分裂和弯曲束的弯曲来测量。裂纹平面垂直于前者的层，而凹槽的梁具有平行的凹口和垂直于层的凹口，后者在后者中被铣削。发现平行于金属陶瓷界面发生的裂纹传播与层平行，并且由于Al层的塑性变形的贡献，韧性随层厚度而增加。垂直于层的裂纹繁殖显示界面处的裂纹挠度/停滞的证据。随着层厚度的较小，由于接口的密度较高，但除了10 nm层厚度的纳米酰胺外，该方向的韧性增加了。在后一种情况下，沿弱柱状晶界发生了裂纹传播，导致韧性显着降低。
The fracture toughness of Al/SiC nanolaminates with different layer thicknesses (in the range 10 to 100 nm) was measured by means of micropillar splitting and bending of a notched beam. The crack plane was perpendicular to the layers in the former while notched beams with the notch parallel and perpendicular to the layers were milled in the latter. It was found that crack propagation parallel to the layers took place along the metal-ceramic interfaces and the toughness increased with the layer thickness due to the contribution of the plastic deformation of the Al layers. Crack propagation perpendicular to the layers showed evidence of crack deflection/arrest at the interface. The toughness in this orientation increased as the layer thickness decreased due to the higher density of interfaces except for the nanolaminates with 10 nm layer thickness. In the latter case, crack propagation took place along the weak columnar grain boundaries, leading to a marked reduction in toughness.
