Al-Cu-Mg-Ag合金与ZL205A合金性能与微观组织对比

采用半连续铸造法分别制备了Al-Cu-Mg-Ag合金与ZL205A合金。对两种铝合金的流动性能、室温及高温拉伸性能、拉伸断口形貌、晶间腐蚀性能和微观组织进行了对比分析。结果表明:浇铸温度为720℃和740℃时,Al-Cu-Mg-Ag合金的流动性能均优于ZL205A合金的。室温、150℃、200℃、250℃下,Al-Cu-Mg-Ag合金的强度均高于ZL205A合金的,且随着温度的升高,其强度降低的幅度要明显低于ZL205A合金的,两种材料的室温伸长率基本相当。Al-Cu-Mg-Ag合金的晶间腐蚀深度在182～246 μm之间,优于ZL205A合金的274～337 μm。Al-Cu-Mg-Ag合金无析出带的宽度要窄于ZL205A合金的。 

Comparison of Properties and Microstructures between Al-Cu-Mg-Ag Alloy and ZL205A Alloy

Al-Cu-Mg-Ag aluminum alloy and ZL205A aluminum alloy are prepared by semi continuous casting. The flow properties, tensile properties at room and high temperatures, tensile fracture morphologies, intergranular corrosion depths and microstructures of the two alloys are compared and analyzed. The results show that when the pouring temperatures are 720℃ and 740℃, the flow properties of Al-Cu-Mg-Ag aluminum alloy are better than those of ZL205A aluminum alloy. At room temperature, 150℃, 200℃ and 250℃, the strengths of Al-Cu-Mg-Ag aluminum alloy are better than those of ZL205A aluminum alloy, and with the increase of temperature, the drop of strength of Al-Cu-Mg-Ag aluminum alloy is slighter than that of 205A aluminum alloy. The room temperature elongations of the two alloys are almost the same. The intergranular corrosion depth of Al-Cu-Mg-Ag aluminum alloy is in the range of 182-246 μm, lower than 274-337 μm of that of the ZL205A aluminum alloy. The width of precipitate free zone of Al-Cu-Mg-Ag aluminum alloy is narrower than that of ZL205A aluminum alloy.