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利用金相、扫描、EBSD和透射等方法对Fe-23Al合金时效过程中的有序畴结构进行表征,并借助模拟手段分析有序畴形成的微观机制。结果表明:经高温固溶处理后,Fe-23Al合金中形成500μm的等轴晶粒,未发现有序畴。随后在625℃,1h时效时,晶粒内部形成沿着某一方向规则排列的有序畴。根据EBSD和TEM分析可以得知,有序畴和无序畴之间的取向差角保持为45°,主要是由于Fe-23Al合金时效过程中发生有序化转变。利用微观相场动力学模型对有序畴形成过程进行模拟,证实这种有序化转变的机制为失稳有序化。
The ordered domain structure of Fe-23Al alloy was characterized by means of metallography, scanning, EBSD and transmission, and the microscopic mechanism of the formation of ordered domains was analyzed by means of simulation. The results show that the formation of 500μm equiaxed grains in the Fe-23Al alloy after solution treatment at high temperature shows no ordered domains. Then at 625 ℃, 1h aging, the grain formed within the ordered arrangement of a certain order along a certain direction. According to EBSD and TEM analysis, it can be seen that the orientation difference between ordered and non-ordered domains remains at 45 °, which is mainly due to the orderly transformation during the aging of Fe-23Al alloy. The micro-phase field dynamics model was used to simulate the formation of ordered domains, and the mechanism of this orderly transformation was proved to be unstable and orderly.