In tungsten-nickel-iron alloy, nickel, as an important binding phase element, has many unique characteristics and plays a key role in the alloy. In terms of characteristics, nickel has excellent ductility and plasticity with a high elongation, which enables it to effectively improve the processing performance of the alloy, allowing the originally brittle tungsten material to be processed into various complex shapes. At the same time, nickel has excellent wettability, and during the sintering process of the alloy, it can fully wet the surface of tungsten particles, forming a uniform coating, which is crucial for promoting the bonding between tungsten particles. In addition, nickel also has certain corrosion resistance, which can help the alloy resist erosion by external media in some specific environments, prolonging the service life of the alloy.
In terms of functions, the primary role of nickel is to act as a binding phase, firmly bonding tungsten particles together to form a dense and stable overall structure. Due to the high brittleness of tungsten itself, pure tungsten particles are difficult to form a material with good mechanical properties. However, the addition of nickel can make up for this defect. Through diffusion and reaction during the sintering process, a strong connection is formed between tungsten particles, thereby improving the density and overall strength of the alloy. Secondly, the good plasticity of nickel can reduce the brittleness of the alloy and improve its toughness, making the alloy not easy to fracture when subjected to external impact, which is particularly important for the alloy in some application scenarios that need to bear dynamic loads, such as in some structural components in the aerospace field. In addition, the wettability of nickel can also promote the densification of the alloy during sintering, reduce the generation of pores, and further optimize the mechanical and physical properties of the alloy. Moreover, nickel and iron can work synergistically to form a stable solid solution, which can not only enhance the strength of the binding phase but also adjust the properties of the alloy according to different proportions to meet different application requirements. To sum up, nickel is an indispensable element in tungsten-nickel-iron alloy, and its characteristics directly affect the processing performance, mechanical properties, and service performance of the alloy.
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