论文标题
纳米结构钼铜复合材料的微结构和失效特性
Microstructure and Failure Characteristics of Nanostructured Molybdenum Copper Composites
论文作者
论文摘要
使用高压扭转，液态 - 金属浸润的Cu30mo70（Weigth百分比）被严重塑性变形。最初的等亚二相结构逐渐转化为由单个CU和MO层组成的层状结构。薄片的厚度在千分尺和纳米范围之间变化，具体取决于施加的应变量。与微观结构特征的完善，强度和硬度大大增加。另外，在中间变形范围内发现了可接受的延展性。通过测量不同裂纹传播方向的断裂韧性来评估产生的复合材料的损伤耐受性。结果表明，变形程度增加，这是一个明显的各向异性的发展，这是纳米结构的层状复合材料并发到剪切平面中的效果。
Liquid-metal infiltrated Cu30Mo70 (weigth percentage) is subjected to severe plastic deformation using high pressure torsion. The initially equiaxed dual phase structure is gradually transformed into a lamellar structure composed of individual Cu and Mo layers. The thickness of the lamellae varies between the micrometer and nanometer ranges depending on the amount of applied strain. Consistent with the refinement of the microstructural features, strength and hardness substantially increase. In addition, an acceptable ductility is found in the intermediate deformation range. An assessment of the damage tolerance of the produced composites is performed by measuring the fracture toughness in different crack propagation directions. The results indicate the development of a pronounced anisotropy with increasing degree of deformation which is an effect of the concurrent alignment of the nanostructured lamellar composite into the shear plane.
