Phase separation and crystallization behavior in melt-spun Al63Si25Ni12 amorphous alloy have been investigated in the present study. Although there is no atomic pair with positive enthalpy of mixing, nm scale phase separation occurs in the as-melt-spun amorphous alloy, exhibiting double-halo diffraction pattern. The amorphous matrix consisting of two different nm-scale Al-rich and Si-rich amorphous phases polymorphically crystallizes into a metastable hexagonal phase by an interface-controlled nucleation and growth mechanism in the first step of crystallization. The metastable hexagonal phase transforms into the mixture of α-Al, Si and Al3Ni phases possibly by a ternary eutectoid reaction in the second step of crystallization.
Bibliographical noteFunding Information:
This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (No. NRF-2019M3D1A1079213 ).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering