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Reactive wetting behaviors of Sn/Cu systems: A molecular dynamics study 被引量:1
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作者 J.Y.Hsieh j.l.chen +3 位作者 C.Chen H.C.Lin S.S.Yang C.C.Hwang 《Nano-Micro Letters》 SCIE EI CAS 2010年第2期60-67,共8页
Influences of temperature and Sn-Cu droplet's composition on reactive wettings of Cu(100), Cu(110), and Cu(111) surfaces were analyzed, by using molecular dynamics(MD) calculations. As a result, the spreading on C... Influences of temperature and Sn-Cu droplet's composition on reactive wettings of Cu(100), Cu(110), and Cu(111) surfaces were analyzed, by using molecular dynamics(MD) calculations. As a result, the spreading on Cu(110)(Cu(100)) has the fastest(slowest) wetting kinetics. A higher temperature or a diluter Cu content in the Sn-Cu alloy droplet results in a higher wettability. Moreover, this work has addressed a theory for positioning the interface separating the liquidus and solidus alloys in the spreading film to confirm the hypothesis that the reactive wetting will come to the end when the interface saturates with the temperature-dependent solidus weight fraction of Cu. 展开更多
关键词 WETTING Surface alloying Molecular dynamics DROPLET
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Misorientation dependent thermal condition-solute field cooperative effect on competitive grain growth in the converging case during directional solidification of a nickel-base superalloy 被引量:2
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作者 X.B.Meng J.G.Li +10 位作者 C.N.Jing J.D.Liu S.Y.Ma J.J.Liang C.W.Zhang M.Wang B.T.Tang T.Lin j.l.chen X.L.Zhang Q.Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第1期151-159,共9页
Nowadays,thermal condition and solute field are considered as the potential dominant factors controlling competitive grain growth during directional solidification process.However,the controlling modes and critical co... Nowadays,thermal condition and solute field are considered as the potential dominant factors controlling competitive grain growth during directional solidification process.However,the controlling modes and critical conditions of competitive grain growth have been drastically debated over the past two decades.In this work,thermal condition and solute field are combined to study the competitive grain growth in the converging case by experimental observation and numerical simulation of bicrystal samples.We find the competitive grain growth is controlled by the cooperative effect of thermal condition and solute field,and the controlling modes are related to the bicrystal misorientation between favorably and unfavorably oriented grains.When the unfavorably oriented grain is low misoriented,unfavorably oriented grain dominates grain selection,and the competitive grain growth performs as solute field domination.However,with the increase of unfavorably oriented grain’s misorientation,the grain selection converts into favorably oriented grain domination,and the competitive grain growth changes to thermal condition domination.To explain these abnormal transformation phenomena,we propose a misorientation dependent thermal condition-solute field cooperative domination model and identify the critical conditions by a critical misorientation(θ_(cm)).According to dynamic equation of dendrite growth,we calculate the critical misorientationθ;to prove this model.The theoretical calculation results agree well with the experimental results. 展开更多
关键词 Competitive grain growth Cooperative effect Thermal condition Solute field Critical misorientation Unusual overgrowth Abnormal transformation
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