论文部分内容阅读
采用等离子活化烧结法,通过Ni箔和Al箔的原位燃烧反应制备了镍基金属/金属间化合物叠层复合材料。微观结构观察表明叠层由反应层和剩余镍层交替组成,且反应层由多个金属间化合物单层构成。这些金属间化合物相的成分呈梯度分布,且随试样处理温度的升高,逐步由富铝相向富镍相转变。相应地,叠层复合材料的抗拉伸强度随着温度升高而逐渐升高,在1473 K温度下制备的复合材料具有最高的抗拉伸强度和伸长率。拉伸试样的断口形貌显示,在较低处理温度(1073和1173 K)制备的叠层复合材料,其断裂是由于金属间化合物层内的横向裂纹与镍层内的剪切带交互作用所引起的。随着处理温度升高,试样的断裂由多重裂纹模式向单裂纹模式转变。
Ni-based metal / intermetallic compound composite was prepared by in-situ combustion reaction of Ni foil and Al foil by plasma activated sintering. The microstructure observation shows that the stack consists of alternating layers of the reaction layer and the remaining nickel layer, and the reaction layer is composed of a plurality of intermetallic compound monolayers. The composition of these intermetallic compounds gradient distribution, and with the sample processing temperature, gradually from the aluminum-rich phase to nickel-rich phase transition. Correspondingly, the tensile strength of laminated composites gradually increases with increasing temperature, and the composites prepared at 1473 K have the highest tensile strength and elongation. The fracture morphology of the tensile specimens shows that the fracture of the laminated composites fabricated at lower processing temperatures (1073 and 1173 K) is due to the interaction of the transverse cracks in the intermetallic layer with the shear bands in the nickel layer Caused by. As the processing temperature increases, the fracture of the specimen changes from multi-crack mode to single-crack mode.