Al-14Cu-7Ce合金中片状Al8CeCu4相的球化行为研究

Spheroidizing behavior of the lamellar Al8CeCu4 phase in the Al-14Cu-7Ce alloy

摘要:

本文通过组织观察、硬度测试和理论计算，研究了Al-14Cu-7Ce合金中片状Al8CeCu4相的高温球化行为。随着退火温度的升高，Al8CeCu4相的球化速度加快。采用通用速率公式计算出Al8CeCu4相的球化过程控制元素为Ce；微观组织观察表明，Al8CeCu4相球化过程包括Gibbs-Thompson 效应作用下片状相分解成棒状相，以及棒状相通过Rayleigh毛细管扰动机制分解成球状相。

Abstract:

The spheroidizing behavior of the lamellar Al8CeCu4 phase in the Al-14Cu-7Ce alloy annealed at elevated temperatures was investigated by microstructural observation, hardness testing and theoretical calculation. With increasing the annealing temperature, the spheroidizing process of the Al8CeCu4 phase was accelerated. The controlling element for the spheroidizing process was determined being Ce by theoretical calculation using the general rate equation. Microstructure observation indicated that the spheroidizing process of the Al8CeCu4 phase included two successive parts, i.e., the curved lamella breaking into long rods by Gibbs-Thompson effect and then the rods separating into spherical particles further by Rayleigh’s capillary induced perturbation mechanism.