The sintering of 18Ni300 will encounter the enrichment of titanium and aluminum elements on the grain boundaries. Is there any possible reason? How to avoid its occurrence to achieve densification?
The reason for poor sintering and enrichment of particle surfaces with aluminum and titanium is that your oven has too high an oxygen partial pressure. Oxygen or water in the furnace atmosphere contributes to the oxidation of the most active elements of the alloy (aluminum and titanium), which form oxide films on the surface of the sintered particles that prevent sintering. In addition, the oxidation of titanium and aluminum on the surface is the driving force for the diffusion of these elements from the depth of the metal to the surface, as a result of which both of these elements are concentrated on the surface of individual particles and at the grain boundaries of the already sintered material. The worse the vacuum in your furnace, the more active the above mechanism is manifested.
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