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采用Gleeble-3800型热模拟试验机进行压缩试验,变形温度为320～480℃、应变速率为0.1～1 s-1,压缩方向与7A04铝合金棒材轴向分别成0°、45°、90°。结果表明:7A04铝合金高温变形的流变应力随温度的升高和应变速率的降低而减小;在低温(T=320℃)和小应变速率(觶ε=0.1 s-1)的条件下7A04铝合金的各向异性最明显;在高温(T=480℃)和小应变速率(觶ε=0.1 s-1)的条件下,7A04铝合金的各向异性最不明显。
Compression tests were carried out on a Gleeble-3800 thermal simulator at a deformation temperature of 320-480 ° C and a strain rate of 0.1-1 s-1, with the direction of compression being 0 °, 45 °, 90 ° relative to the 7A04 aluminum alloy bar °. The results show that the flow stress of 7A04 aluminum alloy decreases with the increase of temperature and strain rate. Under the condition of low temperature (T = 320 ℃) and small strain rate (觯 ε = 0.1 s-1) The anisotropy of 7A04 aluminum alloy is the most obvious. The anisotropy of 7A04 aluminum alloy is the least obvious at high temperature (T = 480 ℃) and small strain rate (觯 ε = 0.1 s-1).