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对于具有细晶和定向组织的7475合金板材来说,如果在生产中增设一道热机械处理工序,在变形速度大约为10~(-4)秒~(-1)时它就具有超塑性。迄今所采取的方法在国际上已被Rockwell改进。本报告所报道的新的热机械处理方法是旨在改善该合金板材的超塑性能。这里所述的试验是7475板材冷轧后不发生再结晶,研究在超塑性变形过程中的动态回复或再结晶。试验将连续铸造的7475合金(含5.72％Zn,2.43％Mg,1.55％Cu,0.19％Cr,0.08％
For a 7475 alloy sheet with fine grain and oriented structure, if a thermomechanical treatment step is added to the production, it will be superplastic at a deformation rate of about 10 -4 seconds -1. The approach taken so far has been internationally refined by Rockwell. The new thermomechanical treatment reported in this report aims to improve the superplasticity of the alloy sheet. The test described here is that 7475 sheet does not recrystallize after cold rolling and studies dynamic recovery or recrystallization during superplastic deformation. Test Continuous casting of 7475 alloy (containing 5.72% Zn, 2.43% Mg, 1.55% Cu, 0.19% Cr, 0.08%