The anisotropy of the interphase boundaries has a substantial impact on the eutectic pattern formation. Using rotating directional solidification (RDS) technique, two distinct eutectic grains, namely quasi-isotropic (floating) and crystallographically locked grains, were identified in three-phase In-Bi-Sn alloy system. The growth dynamics of these grains were investigated in thin samples. The ABAC-type growth pattern, where A, B, C are eutectic phases, is preserved in the quasi-isotropic grains upon evolution of the pattern over the entire crystallographic orientation in RDS experiments. In the locked grains, however, the regularity of the ABAC pattern is disturbed due to the existence of two-fold singularities, i.e. cusps over a well-defined angular range at the surface energy plot. Nevertheless, the ABAC pattern is recovered after the sequence of the unlocked/transient/locked/transient states. The characteristics of both grains are analogous to the nearly steady-state pattern formed upon standard directional solidification experiments. The quasi-isotropic and locked grains in a three-phase ternary eutectic system essentially have the similar dynamical features as the two-phase binary eutectic systems although the microstructural details are highly complex in the three-phase system. These similarities designate that the formation of quasi-isotropic and locked patterns is merely due to the inherent characteristics of the eutectic grains.

相间边界的各向异性对共晶图案的形成有很大的影响。使用旋转定向凝固（RDS）技术，在三相In-Bi-Sn合金系统中鉴定出两种不同的共晶晶粒，即准各向同性（漂浮）晶粒和晶体锁定晶粒。在薄样品中研究了这些晶粒的生长动力学。在RDS实验中，在整个晶体学取向上，ABAC型生长模式（在其中A，B，C为共晶相）会保留在准各向同性晶粒中。然而，在锁定的晶粒中，ABAC图案的规则性由于存在两个奇异点而受到干扰，即在表面能图上的明确定义的角度范围内出现尖峰。然而，在解锁/瞬态/锁定/瞬态状态序列之后，恢复了ABAC模式。两种晶粒的特性都类似于在标准定向凝固实验中形成的近乎稳态的图案。三相三元共晶体系中的准各向同性和锁固晶粒与三相二元共晶体系具有基本相似的动力学特征，尽管在三相体系中微观结构的细节非常复杂。这些相似性表明准各向同性和锁定图形的形成仅归因于共晶晶粒的固有特性。