欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用微观相场法模拟了Ni（75）Al5Cr（20）合金的时效过程,研究了Cr和Al原子在无序fcc固溶体（001）和（002）面上序参数变化与相结构演化之间的关系.结果表明,合金时效序列为：无序基体→L10（M=1）预析出相→DO（22）相.在时效的最初阶段,原子只在面内跃迁,发生面内原子有序化,形成L10（M=1）结构;此后,原子在面间跃迁,原子在（001）面上进一步有序化,在（002）面上无序化,L10（M=1）结构向DO（22）结构转变.随温度降低,L10（M=1）预析出相孕育期和存在期缩短,从而导致DO（22）相的孕育期缩短;L10（M=1）预析出相在低温下容易形成.
英文摘要：
DO_（22） phase with long period ordered structure is the main strengthening phase in Ni-Al-Cr alloy applied in high temperatures,as it hinders the slipping of dislocations during the deformation.Structure transformation from fcc to DO_（22） during the ordering process and phase separation have been studied extensively,but there are only a few of reports on the phase transformation in early precipitation stage,especially on the phase transformation of metastable pre-precipitate.In this paper,the microscopic phase-field method was employed to study the pre-precipitate during the transformation from fcc to DO_（22） in Ni_（75）Al_5Cr_（20） alloy.The early ordering process of Ni_（75）Al_5Cr_（20） alloy are simulated at four different temperatures,and the relationship between the order parameter evolutions of Cr and Al atoms on（001） and（002） planes of disordered fcc solid solution and structure evolution will be investigated.The simulation results demonstrate that the parent phase transformed into Llo（M=1） pre-precipitate with long period ordered structure before DO_（22） phase formed.At the early aging stage,the atomic ordering is proceeded on each plane as the atoms migrate on planes only,and the L1_0（M=1） pre-precipitate formed in the way of congruent ordering.Then,the further ordering of atoms on（001） plane was induced by the migration of atoms between different planes,and the pre-precipitate with L1_0（M=1） structure is gradually transformed into DO_（22） phase.The incubation period and existent time of L1_0（M=1） phase are prolonged with the temperature increasing,as a result,the incubation period of DO_（22） phase is longer when the aging temperature is higher,and the formation of L1_0（M=1） pre-precipitate is easier when the temperature is lower.
同期刊论文项目
同项目期刊论文
Faceting transitions in crystal growth and heteroepitaxial growth in the anisotropic phase-field cry
Structural and electronic properties of conducting Cu nanowire encapsulated in semiconducting zigzag
Microscopic Phase-Field Study of the Occupancy Probability of alpha Sublattices Involving Coordinati
Calculation Model of Effective Interchange Interaction Potential of DO(22) Phase Based on Microscopi
Structure and Migration Characteristic of Heterointerfaces During the Phase Transformation from L1(2
A phase field study for influence of elastic energy on L1(0)-> L1(2) transient ordering in Ni75Al17Z
Microscopic Phase-Field Simulation for Rafting of Ni(75)Al(x)V(25-x) Alloys in the Cyclic Temperatur
Microscopic Phase-Field Simulation for Scaling Behavior of Ni75Cr16.4Al8.6 Alloy during Coarsening P
Microscopic Phase-Field Study on the Atomic Structure and Migration Characteristic of Ordered Domain
Energy studies of precipitation sequence in Ni(75)Al(10)Cr(15) alloy based on the phase field theory
Microscopic phase-field study for oriented diffusion channel effect of nickel-based alloy and phases
MICROSCOPIC PHASE-FIELD METHOD SIMULATION FOR THE IN SITU TRANSFORMATION OF L1(0) PHASE AND L1(2) PH
Phase-Field Simulation for the Effect of Atomic Interchange Energy on the Incubation Time of Ni75Alx
期刊信息
位置：