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研究了温度、时间等因素对Al-0.4Sc合金时效过程中次生Al3Sc粒子的析出和长大规律及其对合金性能的影响。指出在350、400和450℃下时效,次生Al3Sc粒子长大行为基本符合Lifshitz-Slyozov-Wagner(LSW)理论预测;在500℃下时效1h,粒子长大行为接近LSW理论预测值,1h以上,粒子长大速度变慢,与LSW理论偏差较大。当Al3Sc粒子半径在4～40nm的范围内,Al-0.4Sc合金硬度值随着粒子尺寸上升而下降;当Al3Sc半径为4～7.5nm时,硬度为750～850MPa,大约是热处理前的硬度值(200MPa)的3.75～4.25倍,析出强化作用显著;当Al3Sc半径达到40nm时,合金硬度下降到300MPa。
The effects of temperature, time and other factors on the precipitation and growth of secondary Al3Sc particles in Al-0.4Sc alloy during aging and the effects on the properties of the alloy were studied. It is pointed out that the growth behavior of the secondary Al3Sc particles is in good agreement with the Lifshitz-Slyozov-Wagner (LSW) theory at 350, 400 and 450 ℃. The aging behavior at 500 ℃ for 1h is close to the predicted value of LSW theory. , Particle growth slowed down, large deviation from the LSW theory. When Al3Sc particle radius in the range of 4 ~ 40nm, Al-0.4Sc alloy hardness value decreases with the particle size increases; when the Al3Sc radius of 4 ~ 7.5nm, the hardness of 750 ~ 850MPa, about the hardness value before heat treatment (200MPa) 3.75 ~ 4.25 times, precipitation strengthening effect significantly; when Al3Sc radius reaches 40nm, the alloy hardness dropped to 300MPa.