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快速凝固使Al-Sr合金产生了微观组织细化、缺陷密度增加、成分均匀化以及固溶体过饱和化等变化。在Al-Sr合金快速凝固条带(以下称激冷带)横截面上出现“双区”组织。冷却速度达到106K/s激冷带的激冷侧晶粒达到纳米级。变质实验结果表明:不同冷却速度下形成的Al-Sr中间合金具有不同的变质效果,快速凝固的Al-Sr中间合金达到与常规Al-Sr中间合金相同的变质度,其用量减少50%~60%,潜伏期缩短50%左右。
The rapid solidification causes the Al-Sr alloy to have the microstructure refinement, the defect density increase, the component homogenization and the supersaturation of the solid solution. In the Al-Sr alloy rapid solidification strip (hereinafter referred to as the cooling zone) cross-section “double zone” organization. Cooling rate of 106K / s chilling side of the chilled side of the grain to nano-scale. The results of the metamorphic experiment show that the Al-Sr master alloy formed at different cooling rates has different metamorphic effects. The rapidly solidified Al-Sr master alloy reaches the same degeneracy as the conventional Al-Sr master alloy, and its dosage is reduced by 50% -60 %, Shorten the incubation period by about 50%.