Abstract
The mushy zone of hypoeutectic Al-1.5 wt% Ni alloy during high-pressure synthesis was obtained by changing the structure of the graphite heater. Meanwhile, the evolution of the microstructure was investigated. The results demonstrated that three distinguished zones were successfully generated along with the direction of the temperature gradient, including the fully melted area consisting of the columnar dendrite. The mushy zone is composed of an α-Al phase, bulk β-Al3Ni phase, and a eutectic microstructure as well as a non-melted, solid region. In addition, the mass transfer velocity and the time required for the liquid pool to migrate through the mushy zone during thermal-stable treatment under different high pressures were also analyzed. The results showed that the mass transfer was greatly inhibited, and the minimum time required for a liquid droplet to go through the whole mushy zone at 1 GPa and 3 GPa was 746 h and 5523 h, respectively.
Highlights
The temperature gradient is in the nature of every solidification process [1,2,3]
High-pressure solidification is featured by application of high pressure during the melting and solidification process
The temperature distribution in a cylindrical furnace for a high-pressure experiment has been researched [17,18], and the results demonstrated that the temperature distribution is uneven and the temperature gradient is normally relatively low at the solidification interfaces
Summary
For alloys with a certain solidification range, it is inevitable to generate a mushy zone, which is characterized by partial melting during cooling down. It provides the possibility to study the microstructure evolution resulting from the uneven distribution of temperature during high-pressure solidification. Al-Ni intermetallic compounds have excellent corrosion resistance, high temperature stability, and strong corrosion resistance, which cannot be replaced by other alloys. Al-Ni intermetallic compounds are regarded as the research objects of national defense and the military industry. Al-Ni intermetallic compounds are regarded as the research objects of national defense and the military. A series of peritectic part.+There abundant intermetallic compounds with different. There are abundant intermetallic with different solid solubility ranges in to their solubility, above compounds can be divided intosolid two categories: the alloysolid system, such asthe
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