显微组织的影响
(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要:
关键字: 铝合金；铈；时效析出；显微组织
microstructure of Al-Cu-Mg-Mn-Ag alloys
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Al-Cu-Mg-Mn-Ag alloys with different cerium contents were prepared by ingot metallurgy and thermomechanical treatment. The effect of cerium addition on the precipitation and microstructure of alloys was investigated by optical microscopy, differential scanning calorimetry, scanning electron microscopy and transmission electron microscopy. The results show that the cerium addition refines the grains of casting alloys and the average grain size decreases from 93 μm to 30 μm. Trace element cerium addition accelerates the aging hardening process of extruded alloys, increases the maximum hardness of alloys by about 10%, and decreases the precipitation temperature of Ω phase. Moreover, the addition of Ce into Al-Cu-Mg-Mn-Ag alloy decreases the size of Ω phase, and improves the density and thermal stability of Ω phase between 200 ℃ and 300 ℃.
Key words: aluminum alloy; cerium; precipitation; microstructure
