论文部分内容阅读
研究了液相烧结的90W-7Ni-3Fe合金的形变和断裂特征。试样由基体相首先开始屈服,承受塑性变形。当界面结合强度较低时,试样首先沿界面裂开,而当界面结合强度增高到高于钨的解理断裂应力时,试样同时发生钨球的穿晶解理开裂和基体相的塑性撕裂。氢是造成烧结试样界面脆化的重要原因之一。真空热处理能去除界面孔隙中的氢以及钨颗粒和基体相界面之中的氢,从而提高界面的结合强度,使试样的断裂强度和塑性同时得到提高。
The deformation and fracture characteristics of liquid-phase sintered 90W-7Ni-3Fe alloy were investigated. The sample first begins to yield from the matrix phase and undergoes plastic deformation. When the interfacial bonding strength is low, the sample first cracks along the interface, and when the interfacial bonding strength increases higher than the cleavage fracture stress of tungsten, the specimen simultaneously transgranular cleavage cracking of the tungsten ball and the plasticity of the matrix phase Tearing. Hydrogen is one of the important reasons for embrittlement of the sintered sample interface. Vacuum heat treatment can remove the hydrogen in the interface pores and the hydrogen in the interface between the tungsten particles and the matrix, so as to improve the bonding strength of the interface and improve the breaking strength and plasticity of the sample at the same time.