ժҪ Abstract: The metallic liquid with miscibility gap has been widely explored recently because of the increasing plastic deformation ability of phase-separated metallic glass. However, the poor glass-forming ability limits its application as the structural materials due to the positive mixing enthalpy of the two elements. Since high pressure is in favor of the formation of the glass, the effect of pressure on the structural and dynamical heterogeneity of phase-separated Cu50Ag50 liquid is inves-tigated by molecular dynamics simulation in the pressure range of 0�C16 GPa. The results clearly show that the pressure promotes the formation of metallic glass by increasing the number of .vefold symmetry cluster W and dynamical relaxation time; meanwhile, the liquid�Cliquid phase separation is also enhanced, and the homogenous atom pairs show stronger interaction than heterogeneous atom pairs with increasing pressure. The dynamical heterogeneity is related to the formation of .vefold symmetry clusters. The lower growing rate of W at higher pressure with decreasing temperature corresponds to the slow increase in dynamical heterogeneity. The pressured glass with miscibility gap may act as a candidate glass with improved plastic formation ability. The results explore the structural and dynamical heterogeneity of phase-separated liquid at atomic level.
Abstract��Abstract: The metallic liquid with miscibility gap has been widely explored recently because of the increasing plastic deformation ability of phase-separated metallic glass. However, the poor glass-forming ability limits its application as the structural materials due to the positive mixing enthalpy of the two elements. Since high pressure is in favor of the formation of the glass, the effect of pressure on the structural and dynamical heterogeneity of phase-separated Cu50Ag50 liquid is inves-tigated by molecular dynamics simulation in the pressure range of 0�C16 GPa. The results clearly show that the pressure promotes the formation of metallic glass by increasing the number of .vefold symmetry cluster W and dynamical relaxation time; meanwhile, the liquid�Cliquid phase separation is also enhanced, and the homogenous atom pairs show stronger interaction than heterogeneous atom pairs with increasing pressure. The dynamical heterogeneity is related to the formation of .vefold symmetry clusters. The lower growing rate of W at higher pressure with decreasing temperature corresponds to the slow increase in dynamical heterogeneity. The pressured glass with miscibility gap may act as a candidate glass with improved plastic formation ability. The results explore the structural and dynamical heterogeneity of phase-separated liquid at atomic level.
Yun Cheng . Peng-fei Wang . Chuan-xiao Peng . Li-jing Jia . Yu-yang Wang . Li Wang. Effects of pressure on structure and dynamics of metallic glass-forming liquid with miscibility gap[J].Journal of Iron and Steel Research International, 2018, 25(6): 666-673.
Yun Cheng . Peng-fei Wang . Chuan-xiao Peng . Li-jing Jia . Yu-yang Wang . Li Wang. Effects of pressure on structure and dynamics of metallic glass-forming liquid with miscibility gap. , 2018, 25(6): 666-673.
Kramer J, uber nichtleitende.Metallmodifikationen[J].Annalen Der Physik, 1934, 411(1):792-792
[2]
Johnson W L, Samwer K.A universal criterion for plastic yielding of metallic glasses with a (TTg) 23 temperature dependence[J].Physical Review Letters, 2005, 95(19):195501-
[3]
Cheng Y Q, Sheng H W, Ma E.Relationship between structure,dynamics,and mechanical properties in metallic glass-forming alloys[J].Physical Review B, 2008, 78(1):1436-1446
[4]
Demetriou M D, Launey M E, Garrett G, et al.A damage-tolerant glass[J].Nature Materials, 2011, 10(2):123-128
[5]
Hofmann D C, Suh J Y, Wiest A, et al.Designing metallic glass matrix composites with high toughness and tensile ductility[J].Nature, 2008, 451(7182):1085-1089
[6]
Li J B, Jang J S C, Jian S R, et al.Plasticity improvement of ZrCu-based bulk metallic glass by ex situ dispersed Ta particles[J].Materials Science & Engineering A, 2011, 528(28):8244-8248
[7]
Chen G, Cheng J L, Liu C T.Large-sized Zr-based bulk-metallic-glass composite with enhanced tensile properties[J].Intermetallics, 2012, 28(4):25-33
[8]
K��ndig A A, Ohnuma M, Ping D H, et al.In situ formed two-phase metallic glass with surface fractal microstructure[J].Acta Materialia, 2004, 52(8):2441-2448
[9]
Inoue A, Chen S, Masumoto T.Zr Y base amorphous alloys with two glass transitions and two supercooled liquid regions[J].Materials Science & Engineering A, 1994, s 179�C180(94):346-350
[10]
Ziewiec K.Transformations in liquid state and microstructure development in immiscible Fe 60 Cu 20 P 10 Si 5 B 5,alloy[J].Journal of Non-Crystalline Solids, 2012, 358(15):1790-1794
[11]
Mattern N, K��hn U, Gebert A, et al.Microstructure and thermal behavior of two-phase amorphous Ni�CNb�CY alloy[J].Scripta Materialia, 2005, 53(3):271-274
[12]
Chen S S, Zhang H R, Todd I.Phase-separation-enhanced plasticity in a Cu 472 Zr 465 Al 5.5 Nb 0.8,bulk metallic glass[J].Scripta Materialia, 2014, s 72�C73(2):47-50
[13]
Du X H, Huang J C, Chen H M, et al.Phase-separated microstructures and shear-banding behavior in a designed Zr-based glass-forming alloy[J].Intermetallics, 2009, 17(8):607-613
[14]
Ren Y L, Zhu R L, Sun J, et al.Phase separation and plastic deformation in an Mg-based bulk metallic glass[J].Journal of Alloys & Compounds, 2010, 493(1�C2):L42-L46
[15]
Wang L, Qiu K Q, Ren Y L, et al.Microstructure and mechanical properties of a phase-separating Mg-based bulk metallic glass[J].Journal of Alloys & Compounds, 2014, 612(612):5-9
[16]
Du X H, Huang J C, Hsieh K C, et al.Two-glassy-phase bulk metallic glass with remarkable plasticity[J].Applied Physics Letters, 2007, 91(13):45-50
[17]
Chen H S.The influence of structural relaxation on the density and Young��s modulus of metallic glasses[J].Journal of Applied Physics, 1978, 49(6):3289-3291
[18]
Ding J, Cheng Y Q, Ma E.Full icosahedra dominate local order in Cu 64 Zr 34,metallic glass and supercooled liquid[J].Acta Materialia, 2014, 69(5):343-354
[19]
Pronin A A, Kondrin M V, Lyapin A G, et al.Glassy dynamics under superhigh pressure[J].Phys Rev E Stat Nonlin Soft Matter Phys, 2010, 81(1):041503-
[20]
Paluch M, Casalini R, Henselbielowka S, et al.Effect of pressure on the �� relaxation in glycerol and xylitol[J].Journal of Chemical Physics, 2002, 116(22):9839-9844
[21]
Wakeda M, Saida J, Li J, et al.Controlled Rejuvenation of Amorphous Metals with Thermal Processing[J].Scientific reports, 2015, 5:-
[22]
Roland C M, Henselbielowka S, Paluch M, et al.Supercooled dynamics of glass-forming liquids and polymers under hydrostatic pressure[J].Reports on Progress in Physics, 2005, 68(6):1405-1478
[23]
Pronin A A, Kondrin M V, Lyapin A G, et al.Glassy dynamics under superhigh pressure[J].Acta materialia, 2014, 81:420-427
[24]
Debenedetti&Amp P G, Stillinger F H.review article Supercooled liquids and the glass transition[J].Nature, 2001, 6825:259-267
[25]
Pawlus S, Paluch M, Ziolo J, et al.On the pressure dependence of the fragility of glycerol[J].Journal of Physics Condensed Matter An Institute of Physics Journal, 2009, 21(33):332101-
[26]
Ding J, Cheng Y Q, Ma E.Full icosahedra dominate local order in Cu 64 Zr 34,metallic glass and supercooled liquid[J].Acta Materialia, 2014, 69(5):343-354
[27]
Cohen M H, Turnbull D.Molecular Transport in Liquids and Glasses[J].Journal of Chemical Physics, 1959, 31(5):1164-1169
[28]
Miyazaki N, Wakeda M, Wang Y J, et al.Prediction of pressure-promoted thermal rejuvenation in metallic glasses[J].Npj computational mathematics, 2016, 2:16013-
[29]
Ding J, Asta M, Ritchie R O.Anomalous structure-property relationships in metallic glasses through pressure-mediated glass formation[J].Physical review b, 2016, 93(14):14204-1-14204-6
[30]
AJ Bray.Theory of phase-ordering kinetics[J].Physica A Statistical Mechanics & Its Applications, 1995, 194(3):41-52
[31]
Velasco E, Toxvaerd S.Phase separation in two-dimensional binary fluids: A molecular dynamics study[J].Physical Review E Statistical Physics Plasmas Fluids & Related Interdisciplinary Topics, 1996, 54(1):605-612
[32]
Xu JinFeng, Wei BingBo.Liquid phase flow and microstructure formation during rapid solidification[J].Acta Phys. Sin., 2004, 53(6):1909-1915
[33]
YS Li, Z Chen, YL Lu, GD Xu.Dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys[J].Chin. Phys., 2007, 16(3):854-861
[34]
Li M L, Fu X Y, Sun H N, et al.Molecular dynamics investigation of the glass transition at high-pressure in the phase separation liquid[J].Physics, 2009, 58(8):5604-5609
[35]
Palacci J, Sacanna S, Steinberg A P, et al.Living crystals of light-activated colloidal surfers[J].Science, 2013, 339(6122):936-940
[36]
Hnisz D, Shrinivas K, Young R A, et al.A Phase Separation Model for Transcriptional Control[J].Cell, 2017, 169(1):13-