| Autor: |
Zhang, Jing, Chen, Zheng, Zhang, MingYi, Lai, QingBo, Lu, YanLi, Wang, YongXin |
| Zdroj: |
Science in China. Series G: Physics & Astronomy; Aug2009, Vol. 52 Issue 8, p1154-1160, 7p |
| Abstrakt: |
Microscopic phase field simulation is performed to study antisite defect type and temporal evolution characteristic of D022-Ni3V structure in Ni75Al x V25− x ternary system. The result demonstrates that two types of antisite defect VNi and NiV coexist in D022 structure; however, the amount of NiV is far greater than VNi; when precipitates transform from D022 singe phase to two phases mixture of D022 and L12 with enhanced Al:V ratio, the amount of VNi has no evident response to the secondary L12 phase, while NiV exhibits a definitely contrary variation tendency: NiV rises without L12 structure precipitating from matrix but declines with it; temporal evolution characteristic and temperature dependent antisite defect VNi, NiV are also studied in this paper: The concentrations of the both defects decline from high antistructure state to equilibrium level with elapsed time but rise with elevated temperature; the ternary alloying element aluminium atom occupies both α and β sublattices of D022 structure with a strong site preference of substituting α site. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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