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本文研究了国产工业纯铝的超塑性。纯度为99.5％的铝试样,经500℃退火3小时,在300～500℃范围内进行拉伸试验,350℃和初始应变速率ε_0=8×10~(-2)1/分时具有最大延伸率。温度为350℃时,用初始应变速率ε_0=8×10~(-3)1/分到6×10~(-2)1/分不同的应变速率进行拉伸试验,初始应变速率为8×10~(-2)/1分时延伸率出现峰值。另一方面,晶粒尺寸较小试样的延伸率小于晶粒尺寸大的试样的延伸率。在拉伸过程中晶粒长大、晶粒拉长以及在拉伸过程中发生再结晶。最大的应变速率敏感性指数m=0.3,最大延伸率为164％。说明工业纯铝在一定的温度和应变速率时具有轻微的超塑性。
This paper studies the superplasticity of domestic industrial pure aluminum. Aluminum samples with a purity of 99.5% were annealed at 500 ℃ for 3 hours and tensile tested at 300 ~ 500 ℃. The tensile test was carried out at 350 ℃ with an initial strain rate of ε_0 = 8 × 10 ~ (-2) 1 / min Elongation. Tensile tests were carried out at different strain rates of initial strain rate ε 0 = 8 × 10 -3 / 1 to 6 × 10 -2 / s at a temperature of 350 ° C. The initial strain rate was 8 × 10 ~ (-2) / 1 minutes when the peak elongation. On the other hand, the elongation of the sample with the smaller grain size is smaller than the elongation of the sample with the larger grain size. The grain grows during stretching, the grains are elongated and recrystallization occurs during stretching. The maximum strain rate sensitivity index m = 0.3, the maximum elongation of 164%. Pure aluminum industry shows a slight superplasticity at a certain temperature and strain rate.