利用微观相场动力学模型模拟Ni-Al-V合金沉淀过程中L12相间有序畴界面，对界面结构及其界面处原子的行为进行了研究。研究表明L12有序畴间存在三种稳定界面以及两种过渡型界面；界面的迁移性与界面结构有关，(001)L12和(002)L12对应、(001)L12和(001)L12对应且有两个Ni原子的稳定界面可以迁移，迁移前后界面结构保持不变，且在迁移的过程中形成过渡型界面；而(001)L12和(002)L12对应且有一个Ni原子的稳定界面则不可迁移；合金元素在不同的界面处有不同的偏聚和贫化倾向，Al原子在所有界面处贫化，V原子在所有界面处偏聚，Ni原子在可迁移界面处贫化，在不可迁移界面处偏聚，且各元素在不同的界面处偏聚以及贫化程度也不一样。
Microscopic phase-field model was used to simulate the interphase boundaries formed between ordered L12 domains in Ni-Al-V alloy. The interphase boundary structure and the behavior of atoms at the boundary were investigated using the occupation probability of atoms. The results show that there are three kinds of stable interphase boundaries and two kinds of transitional interphase boundaries formed between ordered L12 domains. It is found that the migration ability is related to the structure of interphase boundary. The stable interphase boundary which has two Ni atoms and with(001)L12 and (002)L12 in alignment or with (001)L12 and (001)L12 in alignment can migrate and form a transitional interphase boundary in the process of migration, the structure of interphase boundary is invariaent before and after the migration. The interphase boundary which has one Ni atom and with (001)L12 and (002)L12 in alignment can not migrate. The elements of alloy have different preferences of accumulation or leanness at different boundaries, Al is leanness at all kinds of boundaries but V accumulates, Ni is leanness at movable boundary but accumulates at the unmovable boundary. The degree of leanness and accumulation are also different at different boundaries.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%