Abstract
The phase selection of hyper-peritectic Al-47wt.%Ni alloy solidified under different pressures was investigated. The results show that Al3Ni2 and Al3Ni phases coexist at ambient pressure, while another new phase α-Al exists simultaneously when solidified at high pressure. Based on the competitive growth theory of dendrite, a kinetic stabilization of metastable peritectic phases with respect to stable ones is predicted for different solidification pressures. It demonstrates that Al3Ni2 phase nucleates and grows directly from the undercooled liquid. Meanwhile, the Debye temperatures of Al-47wt.%Ni alloy that fabricated at different pressures were also calculated using the low temperature heat capacity curve.
Highlights
IntroductionThe potential application value of intermetallic compounds has attracted extensive attention
As high temperature materials, the potential application value of intermetallic compounds has attracted extensive attention
When the pressure is 2 GPa, 3 GPa and 4 GPa, additional new α-Al peaks present at the diffraction angles of 38.4◦, 38.86◦ and 38.96◦, respectively, indicating the formation of new phase, and the peaks of the α-Al shift to the higher angle
Summary
The potential application value of intermetallic compounds has attracted extensive attention. Among these intermetallic compounds, the Al Ni series is one of the most important and promising candidate materials in high temperature environment. The Al Ni series is one of the most important and promising candidate materials in high temperature environment It is mainly used in the fields of aviation, blades, aerospace vehicles, etc. According to the phase diagram of Al-Ni alloy, there are abundant intermetallic compounds, such as AlNi, Al3 Ni, AlNi3 and Al3 Ni2 , in the composition range of peritectic reaction. Löser et al [8]
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