(中北大學(xué) 材料科學(xué)與工程學(xué)院，太原 030051)
摘 要: 采用三元微觀相場動(dòng)力學(xué)模型，研究第一到第四層Ni-Al原子間作用勢對Ni75Al14Mo11合金沉淀過程中原子有序行為及γ′相沉淀的影響。結(jié)果表明：當(dāng)?shù)谝粚覰i-Al原子間作用勢增大時(shí)，Al和Mo有序化和簇聚的程度和速度增大；當(dāng)?shù)诙覰i-Al原子間作用勢增大時(shí)，Al和Mo有序化和簇聚的程度和速度降低；當(dāng)?shù)谌龑覰i-Al原子間作用勢增大時(shí)，Al和Mo的有序化和簇聚的程度和速度增大，相比之下沉淀后期較大的原子間作用勢對Mo的影響程度較小；第四層Ni-Al原子間作用勢對Ni和Al有序化和簇聚的影響與第二層原子間作用勢的影響相同。第一、三層Ni-Al原子間作用勢增大，將促進(jìn)γ′相的生成，且γ′相體積分?jǐn)?shù)增大，而第二、四層原子間作用勢對γ′相影響與第一、三層的影響效果則相反。
關(guān)鍵字: 微觀相場；Ni75Al14Mo11合金；γ′相；沉淀
（College of Materials Science and Engineering, North University of China, Taiyuan 030051, China）
Abstract:The influence of Ni-Al interaction energy from the first layer to the fourth layer on the ordering behavior of Ni75Al14Mo11 alloy atoms and the precipitation of γ′ phase was investigated by the microscopic phase-field kinetic model. The results show that as the first Ni-Al interaction energy increases, the ordering and the clustering degree of Al and Mo atoms increase. As the second Ni-Al interaction energy increases, the ordering and the clustering degree of Al and Mo atoms decrease. As the third Ni-Al interaction energy increase, the degree and speed of the ordering and the clustering of Al and Mo atoms increase. Compared with the early process, the larger atomic interaction in the later precipitation process has less impact on the Mo atoms. And the influence of the fourth Ni-Al interaction energy is the same with the second one. The increase of the first and the third Ni-Al interaction energy promotes the generation of γ′ phase, and the volume fraction increases, while the influences of the second and the fourth Ni-Al interatomic energy on γ′ phase are contrast to those of the first and the third ones.
Key words: microscopic phase-field; Ni75Al14Mo11 alloy; γ′ phase; precipitation
