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通过微观组织观察、硬度测试和理论计算,研究了Al-14Cu-7Ce合金中片状Al_8Ce Cu_4相的高温球化行为。实验结果表明,随着退火温度的升高,Al_8Ce Cu_4相的球化速度加快;采用通用速率公式计算出Al_8Ce Cu_4相的球化过程控制元素为Ce;微观组织观察表明,Al_8Ce Cu_4相球化过程包括Gibbs-Thompson效应作用下片状Al_8Ce Cu_4相首先分解成棒状Al_8Ce Cu_4相,随后在Rayleigh毛细管扰动机制作用下进一步分解成球状Al_8Ce Cu_4相。
The microstructure observation, hardness test and theoretical calculation were used to study the high-temperature spheroidizing behavior of flaky Al_8Ce Cu_4 phase in Al-14Cu-7Ce alloy. The experimental results show that the ball speed of Al_8Ce Cu_4 phase increases with the increase of annealing temperature. The control element of the spheroidization process of Al_8Ce Cu_4 phase is calculated by the general rate formula. The microstructure observation shows that the spheroidization process of Al_8Ce Cu_4 phase Including the Gibbs-Thompson effect, the flaky Al_8Ce Cu_4 phase is firstly decomposed into rod-like Al_8Ce Cu_4 phase and then further decomposed into the spherical Al_8Ce Cu_4 phase under Rayleigh capillary perturbation mechanism.