Metastable phase separation kinetics controlled by superheating and undercooling of liquid Fe-Cu peritectic alloys
Metastable phase separation kinetics controlled by superheating and undercooling of liquid Fe-Cu peritectic alloys
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DOI：
10.1016/j.jallcom.2022.165268
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发表时间：
2022-05
影响因子：
6.2
通讯作者：
Yuhao Wu;Baorong Zhu;Huiling Du;Zhenchao Xia;Jingwen Su;Zhiming Gao
中科院分区：
文献类型：
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作者：
Yuhao Wu;Baorong Zhu;Huiling Du;Zhenchao Xia;Jingwen Su;Zhiming Gao
通过实验和模拟研究了过热和过冷对fe65cu35玻璃熔剂包晶合金亚稳相分离动力学的影响。MPS发生在175 ~ 297 K的实验过冷范围内，并诱导偏心核-壳宏观偏析（ECSM）结构。首次证明了相分离过冷ΔTPSand、相分离时间与过冷ΔTHand、过冷ΔTcould的关系可以用曲面函数来描述。增大ΔTPSwas下观察到较小的ΔTHor较大的ΔTcondition。ΔTHand和ΔTcontributed的升高导致tps的延伸，进而导致富cu区扩大，富fe区显微硬度提高，表明MPS更加彻底。数值模拟结果表明，地表偏析、Marangoni对流和Stokes沉积作用是推动东太平洋环流演化的主要因素。
The effects of superheating and undercooling on the metastable phase separation (MPS) kinetics for glass-fluxed Fe65Cu35peritectic alloy were investigated by experiments and simulations. MPS occurred in the experimental undercooling range of 175–297 K, and induced the eccentric core-shell macrosegregation (ECSM) structure. It was first demonstrated that the relationship of the phase separation undercooling ΔTPSand the phase separation timetPSwith the superheating ΔTHand the undercooling ΔTcould be described by curved-surface functions. The increasing ΔTPSwas observed under the smaller ΔTHor greater ΔTcondition. Both the rising ΔTHand the ΔTcontributed to the extension of thetPS, and then resulted in the expansion of Cu-rich zone as well as the microhardness improvement of Fe-rich zone, indicating the more thorough MPS. Numerical simulations showed that the surface segregation, Marangoni convection and Stokes sedimentation mainly pushed the evolution of the ECSM.