Microstructure and Mechanical Properties of Novel Heat-Resistant Al-12ce-Xcu-Ymg Alloy Under Laser Melting

Abstract

The novel Al-Ce alloys were designed with the addition of Cu and Mg elements using laser melting. The microstructure and high-temperature mechanical properties of the novel Al-Ce alloys were studied in this paper. The results showed that the laser melted Al-12Ce alloys are composed of eutectic α-Al and Al 11 Ce 3 phase. The addition of Cu can refine the primary phase of Al-Ce alloys by forming the Al 4 CeCu participation, while the Mg element mainly produces solid solution strengthening. The addition of Cu and Mg elements can significantly increase the room mechanical properties of eutectic Al-Ce alloys. The hardness of laser melted Al-12Ce-3Cu-2.4Mg alloys is 116.42% higher than that of traditional Al-12Ce alloys. At 300°C, the tensile strength(TS) of Al-Ce alloys with different compositions can be maintained at 80% of room temperature and the elongation (EI) is significantly increased. Therefore, the Al-Ce-Cu-Mg alloy system is expected to be a new widely used heat-resistant alloy.

Keywords: Aluminum-cerium alloy, Microstructure, High-temperature mechanical properties, Strengthening mechanism