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对含铒5A06铝合金进行75~450℃,1h退火处理和75、150、200、250、275、300、400、470℃的从0.5~100h退火处理,并对退火后的合金进行硬度测试、光学显微镜分析、扫描电镜分析,发现退火温度对合金组织性能影响显著,退火时间对合金影响较微小。进行不同温度1h退火时,在75℃退火,合金硬度少量下降;在125~250℃温度退火,随退火温度增加合金硬度下降趋势较缓,耐腐蚀性普遍较低;在250~275℃退火后,合金硬度大幅下降,降幅达28%,但耐腐蚀性能显著提高;275℃以上温度退火,合金硬度变化趋于稳定。进行不同时间退火时,合金在小于200℃和大于275℃时硬度随时间的变化不明显,合金在任一温度下退火0.5h即可完成主要的组织性能转变,退火100与0.5h的合金组织性能差异不大,但在200~275℃区间内,随退火时间延长合金硬度连续下降,250℃退火时合金硬度随时间的延长下降最为明显。在本实验不同退火工艺下合金硬度HV均不小于850MPa。
The erbium-containing 5A06 aluminum alloy was annealed at 75-450 ℃ for 1 hour and annealed at 0.5-150 hours at 75,150,200,250,275,300,400,470 ℃, and the hardness of the annealed alloy was tested. Optical microscopy analysis and scanning electron microscopy analysis showed that the annealing temperature had a significant effect on the microstructure and properties of the alloy. The annealing time had little effect on the alloy. When annealed at 75 ℃ for 1h, the hardness of alloy decreases a little. When annealed at 125 ~ 250 ℃, the hardness of alloy decreases slowly with the increase of annealing temperature and corrosion resistance is generally low. After annealing at 250-275 ℃ , The alloy hardness dropped significantly, a decline of 28%, but the corrosion resistance significantly improved; 275 ℃ above the temperature annealing, the alloy hardness changes stabilized. The results showed that the microstructure of the alloys annealed at different temperatures for less than 200 ℃ and greater than 275 ℃ did not change obviously with time, However, in the range of 200-275 ℃, the hardness of the alloy decreases continuously with the annealing time, and the hardness of the alloy decreases most obviously with the time extending at 250 ℃. In this experiment different annealing process alloy hardness HV are not less than 850MPa.