Microstructure of under-cooled Sn–Bi and Al–Si alloys

Mechanism of Bi Precipitation in Sn65.4Bi34.6 Eutectic System

“…3) Bi particles grow with decreasing the cooling rate. 4,5) The Bi precipitation considerably deteriorates the mechanical property of the alloy. 1,6) In this paper, we investigate the Bi precipitation mechanism in an eutectic alloy of Sn-Bi by a series of positron annihilation spectroscopy.…”

“…17) It is accepted that a cooling rate has influence on the microstructure and mechanical properties of Bi-containing eutectic alloys. 4,5) The growth of Bi particles at a lower cooling rate deteriorates the mechanical properties. 1,6) In fact, indentation creep experiments revealed that Sn-Bi alloys cooled at a high cooling rate of 8 K s À1 have more creep resistance than those slowly cooled at 10 À2 K s À1 with massive precipitation of Bi particles.…”

Effect of Solidification Rate on Microstructure and Solid/Liquid Interface Morphology of Ni–11.5 wt% Si Eutectic Alloy

“…In general, the undercooling in the front of solid/liquid interface is increased with increasing the solidification rate. The nucleation rate and growth rate of the Ni 3 Si phase are increased with the increase of the undercooling, and consequently result in the decrease of the lamellar spacing [18] . On the other hand, the diffusion paths tend to be larger with the increase of the undercooling, making the mass transport less effective, and the diffusion rate of solute in the liquid is decreased as a result.…”

Microstructure and field emission properties of the Si–TaSi2 eutectic in situ composites by electron beam floating zone melting technique

“…Both the nucleation rate and the growth rate of TaSi 2 phase are related with the undercooling and the diffusion rate of solute in the liquid. In general, a higher solidification rate can lead to a higher undercooling, consequently resulting in the refinement of the microstructure [21]. With the increase in undercooling, the nucleation rate and growth rate of the TaSi 2 phase are increased, whereas the diffusion paths are larger, making the mass transport less effective, the diffusion rate of solute in the liquid is decreased [22].…”