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| 1 | Peritectic solidification under high undercooling conditions显示文摘The solidification characteristics of highly undercooled Cu-7.77% Co peritectic alloy has been examined by glass fluxing technique. The obtained undercoolings vary from 93 to 203 K(0.14 T_L). It is found that the a(Co) phase always nucleates and grows preferentially, which is followed by peritectic transformation. This means that the peritectic phase cannot form directly, even though the alloy melt is undercooled to a temperature far below its peritectic point. The maximum recalescence temperature measured experimentally decreases as undercooling increases, which is lower than the thermodynamic calculation result owing to the actual non-adiabatic nature of recalescence process. The dendritic fragmentation of primary α(Co) phase induced by high undercooling is found to enhance the completion of peritectic transformation. In addition, the LKT/BCT dendrite growth model is modified in order to make it applicable to those binary alloy systems with seriously curved liquidus and solidus lines. The dendrite | Chongde Cao Xiaoyu Lu Bingbo Wei | 1999 | Chinese Science Bulletin1999，44，14： | 11 |
| 2 | Rapid growth of ternary eutectic un der high undercooling conditions显示文摘Rapid solidification of bulk Ag42.4Cu21.6Sb36 ternary eutectic alloy is accomplished by glass fluxing method,during which the maximum undercooling attains 114 K (0.16 TE). Under high undercooling conditions,the ternary eutectic consists ofε (Ag3Sb),(Sb)and θ(Cu2Sb)phases,instead of (Ag),(Sb)and θphases as predicted by the phase diagram.In the sample of small undercooling,the alloy microstructure is characterized by the mixture of primary θ(Cu2Sb),(ε+θ) and (ε+Sb) pseudobinary eutectics,and regular (ε+θ+Sb) ternary eutectic.With the increase of undercooling, θ (Cu2Sb) primary phase and pseudobinary eutectics disappear gradually,and ternary eutectic transfers from regular to anomalous structure.When undercooling exceeds 102 K,anomalous (ε+θ+Sb) ternary eutectic is the unique microstructure.Competitive nucleation and growth of these three eutectic phases is the main cause for the formation of complex growth morphologies.Based on the current experiments and theoretical calculations,it can be concluded that the intermetallic compound phaseθ(Cu2Sb) is the leading nucleating phase. | RUAN Ying CAO Chongde WEI Bingbo | 2004 | Science China(Physics,Mechanics & Astronomy)2004，47，6： | 10 |
| 3 | Thermophysical properties of Ni-5%Sn alloy melt显示文摘The surface tension and specific heat of Ni-5%Sn alloy melt were measured by the oscillating drop method and the drop calorimetric method using electromagnetic levitation, respectively. The temperature coefficient of surface tension is 6.43×10-4 N·m?1K?1 within the temperature regime of 1464-1931 K. The enthalpy change was measured in the temperature range from 1461 to 1986 K, and the average specific heat was obtained as 43.03 J·mol?1K?1. Some other thermophysical properties, such as viscosity, solute dif-fusion coefficient, density, thermal diffusivity and thermal conductivity of this alloy melt, were derived based on the experimentally measured surface tension and specific heat. Using these thermophysical parameters, the relation between solute trapping and under-cooling in rapidly solidified α-Ni was calculated, and the theoretical prediction shows a good agreement with experimental data. | DAI Fuping CAO Chongde WEI Bingbo | 2006 | Science China(Physics,Mechanics & Astronomy)2006，49，2： | 7 |
| 4 | Phase separation and rapid solidification of liquid Cu_(60)Fe_(30)Co_(10) ternary peritectic alloy显示文摘The metastable liquid phase separation and rapid solidification of Cu60Fe30Co10 ternary peritectic alloy were investigated by using the drop tube technique and the differential scanning calorimetry method. It was found that the critical temperature of metastable liquid phase separation in this alloy is 1623.5 K, and the two sepa- rated liquid phases solidify as Cu(Fe,Co) and Fe(Cu,Co) solid solutions, respec- tively. The undercooling and cooling rate of droplets processed in the drop tube increase with the decrease of their diameters. During the drop tube processing, the structural morphologies of undercooled droplets are strongly dependent on the cooling rate. With the increase of the cooling rate, Fe(Cu,Co) spheres are refined greatly and become uniformly dispersed in the Cu-rich matrix. The calculations of Marangoni migration velocity (VM) and Stokes motion velocity (VS) of Fe(Cu,Co) droplets indicated that Marangoni migration contributes more to the coarsening and congregation of the minor phase during free fall. At the same undercooling, the VM/VS ratio increases drastically as Fe(Cu,Co) droplet size decreases. On the other hand, a larger undercooling tends to increase the VM/VS value for Fe(Cu,Co) drop- lets with the same size. | DAI FuPing, CAO ChongDe & WEI BingBo Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China | 2007 | Science China(Physics,Mechanics & Astronomy)2007，50，4： | 6 |
| 5 | Rapid growth of primary dendrite in highly undercooled copper-antimany alloy显示文摘The droplets of Cu-11wt.%Sb hypoeutectic alloy have been rapidly solidified during containerless processing in a 3 m drop tube. The undercooling and cooling rates are estimated, and both play a dominant role in the dendritic growth of primary Cu phase. Undercoolings up to 200 K (0.16TL, where TL is the liquidus temperature) have been obtained in the experiment. With the increase of undercooling, the microstructural evolution of primary Cu phase proceeds from remelted dendrites to the equiaxed grains. A coarse dendritic grain microstructure can form in the undercooling range of 61~102 K and at cooling rates of 1.35×102~2.66×103 K/s. The segregationless solidification of Cu-11wt.%Sb hypoeutectic alloy occurs when undercooling is more than 176 K. The growth of primary Cu phase is mainly controlled by solute diffusion. | YAO Wenjing , CAO Chongde and WEI Bingbo(Laboratory of Materials Science in Space, Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China) | 2002 | Progress in Natural Science:Materials International2002，12，12： | 2 |
| 6 | Biosynthetic labeling with 3-O-propargylcaffeyl alcohol reveals in vivo cell-specific patterned lignification in loquat fruits during development and postharvest storage显示文摘Lignification is a major cell wall modification that often results in the formation of sophisticated subcellular patterns during plant development or in response to environmental stresses.Precise localization of the spatiotemporal deposition of lignin is of great importance for revealing the lignification regulatory mechanism of individual cells.In loquat fruits,lignification typically increases the flesh lignin content and firmness,reducing their edibility and processing quality.However,the precise localization of the spatiotemporal active zones of lignification inside loquat fruit flesh remains poorly understood,and little is known about the contribution of patterned lignification to cell wall structure dynamics and the subsequent fruit-quality deterioration.Here,we performed an emerging bioorthogonal chemistry imaging technique to trace the in vivo patterned lignification dynamics in cells of loquat fruit flesh during development and storage.In developing fruits,lignified cells(LCs)and vascular bundles(VBs)were the zones of active lignification,and ring-like LCs deposited lignin at both the inner wall layer and the outer periphery sides.The domino effect of the generation of LCs was preliminarily visualized.In mature fruits,the newly formed lignin in the flesh of fruits during storage was specifically deposited in the corners and middle lamellae of parenchyma cells surrounding the VBs,resulting in the development of a reticular structure.Based on the findings,distinct spatiotemporal patterned lignification modes for different flesh cells in loquat fruits were proposed.These findings provide loquat lignification dynamics together with spatiotemporal data that can improve our understanding of the lignification process in planta. | Nan Zhu Chenning Zhao Yuqing Wei Chongde Sun Di Wu Kunsong Chen | 2021 | Horticulture Research2021，8，1： | 2 |
| 7 | High undercooling of bulk water during acoustic levitation显示文摘 | Yongjun Lü Chongde Cao Bingbo Wei | 2003 | Science in China Series G: Physics Mechanics and Astronomy2003，，3： | 1 |
| 8 | Containerless rapid solidification of undercooled Cu-Co peritectic alloys显示文摘 | Chongde Cao Nan Wang Bingbo Wei | 2000 | Science in China Series A: Mathematics2000，，12： | 1 |
| 9 | Containerless rapid solidification of undercooled Cu-Co peritectic alloys显示文摘 | Chongde Cao Nan Wang Bingbo Wei | 2000 | Science in China Series A: Mathematics2000，，12： | 1 |
| 10 | Containerless rapid solidification of undercooled Cu-Co peritectic alloys显示文摘 | Chongde Cao Nan Wang Bingbo Wei | 2000 | Science in China Series A: Mathematics2000，，12： | 1 |
| 11 | High undercooling of bulk water during acoustic levitation显示文摘 | Yongjun Lü Chongde Cao Bingbo Wei | 2003 | Science in China Series G: Physics Mechanics and Astronomy2003，，3： | 1 |
| 12 | Containerless rapid solidification of undercooled Cu-Co peritectic alloys显示文摘 | Chongde Cao Nan Wang Bingbo Wei | 2000 | Science in China Series A: Mathematics2000，，12： | 1 |
| 13 | High undercooling of bulk water during acoustic levitation显示文摘 | Yongjun Lü Chongde Cao Bingbo Wei | 2003 | Science in China Series G: Physics Mechanics and Astronomy2003，，3： | 1 |
| 14 | Rapid dendritic growth of Al-Ge hypoeutectic alloy in a drop tube显示文摘Dendritic growth in Al-45% Ge hypoeutectic alloy has been investigated during free fall in a 3 m drop tube. Calculations indicate that the undercooling obtained for the falling Al-45% Ge droplets ranges from 13 K to 201 K. The maximum undercooling attains 0.27TL. With the increase of undercooling, the primary (Al) phase undergoes a 'columnar dendrite to equiaxed dendrite' structural transition. According to the current rapid dendritic growth theory, the growth of primary (Al) phase is always controlled by solute diffusion. | LIU Xiangrong, CAO Chongde and WEI Bingbo(Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China) | 2003 | Progress in Natural Science:Materials International2003，13，2： | 0 |
| 15 | Irreversibility Line and Critical Current显示文摘The study of“irreversibility line”and magnetization curves of a YBCO superconductor prepared by melt-textured growth method is presented.It is shown'that the temperature T above whjich the magnetization is reversible can be identified with the temperature above which J_(c) is negligible,demonstrating the.Yeshurun and Malozemoff's theory about“irreversibility line”. | WEI Chongde LIU Zunxiao LAN Jan GAN Zizhao REN Hongtao HE Qing XIAO Ling | 1992 | Chinese Physics Letters1992，9，1： | 0 |
| 16 | Peak Effects in EuBa_(2)Cu_(3)O_(y) Crystal Prepared by Melt-Textured Growth Method显示文摘The magnetization curves of EuBa_(2)Cu_(3)O_(y) crystal prepared by melt-textured growth method were measured from 1.5 to 87K up to field 7.5T for H||C and H⊥C.Peak effects were observed at 60,70 and 73K for H||C,and 70,73 and 77K for H⊥C.It is shown that the magnetic field Hp at which the magnetization or critical current reach their extremum is approximately independent of temperature lire and the peak erects observed can be explained by matching effects. | WEI Chongde LIU Zunxiao CAN Zizhao REX Hongtao XIAO Ling HE Qing | 1993 | Chinese Physics Letters1993，10，7： | 0 |
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