摘要：本文是以Al-Cu-Ce合金为研究对象，以将合金先进行退火处理，再比较硬度以及观察金相组织的方式探讨Al-Cu-Ce合金的热稳定性。在本论文中，主要运用了两种比较方式：（1）同一个温度下，随时间的延长，硬度和组织形态的变化；（2）不同温度同一个时间段下，硬度和组织形态的变化。

　　　由金相试样观察分析实验结果，我们可以得出如下结论：（1）同一个温度下，硬度变化为先上升再下降，有一个峰值存在，组织形态为逐渐球化。（2）Al-Cu-Ce合金组织在相同加热温度下，随着加热时间的延长，组织逐渐粗化。（3）Al-Cu-Ce合金在相同的加热时间下，随着加热温度的升高，组织在逐渐粗化。

关键词：Al-Cu-Ce合金；热稳定性；硬度

Abstract: This article is based on the Al-Cu-Ce alloy as the research object. To alloy annealed first, then measure the hardness and observe the microstructure of the thermal stability of Al-Cu-Ce alloy，In this paper, the main use of the two comparison：(1) with a temperature change with time hardness and tissue morphology; (2) with a time period of the different temperatures, hardness and morphological changes.

Analysis of the experimental results observed by the metallographic sample, we can draw the following conclusions：(1) with a temperature, hardness first increased and then decreased, the existence of a peak, morphology of the gradual periodization. (2) Al-Cu-Ce alloy under the same heating temperature, with the heating time, the grains gradually coarsening. (3)Al-Cu-Ce alloy under the same heating time ,with the heating temperature ,the organization gradually coarsening． 

Keywords: Al-Cu-Ce alloy, thermal stability, hardness