【摘 要】
:
The metastable liquid phase separation and rapid solidification of Cu60Fe30Co10 ternary peritectic alloy were investigated by using the drop tube technique and
【机 构】
:
Department of Applied Physics
【基金项目】
:
Scientific and Technological Creative Foundation of Youth in Northwestern Polytechnical University of China;国家自然科学基金
论文部分内容阅读
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 separated liquid phases solidify as Cu(Fe,Co) and Fe(Cu,Co) solid solutions, respectively. 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) droplets with the same size.
其他文献
The microstructure and wear performance of Al2O3-13% TiO2 coatings prepared by plasma spraying of agglomerated nanoparticle powders were investigated. SEM analy
The effect of ultrasonic vibration on the dechromisation corrosion of a CuCr alloy in HCl solution was studied and the corrosion mechanisms were analyzed. It is
硫化钠溶液吸收-还原硫法是湿法烟气脱硫中具有良好应用前景的新方法.烟气中NOx与SO2往往同时存在,可能会对该工艺造成影响,为此,本文就NOx对该吸收液中S2-、HSO3-、S2O32-以
A robust unified controller was proposed for wheeled mobile robots that do not satisfy the ideal rolling without slipping constraint. Practical trajectory track
Based on wavelet neural networks (WNNs) and recurrent neural networks (RNNs), a class of models on recurrent wavelet neural networks (RWNNs) is proposed.The new
我国目前的建筑业及工程管理正处于不断改革与发展的时期,研究工程中的质量控制、进度控制、造价控制三大控制要素对实现工程目标有着直接的意义.本文通过对实现工程项目管理
本文测定了鱼台县武台乡土壤重金属的含量,并进行了相关分析、整理,并对鱼台县武台乡土壤重金属污染状况进行了综合评价.
The growth mechanism of the peritectic η phase involving the peritectic reaction and peritectic transformation in Cu-70%Sn alloy was investigated under directi
生态建筑学是研究建筑环境与自然生物共生共存,和谐统一关系的综合生态学科.
An Al-doped spinel lithium manganese oxide was prepared by the adipic acid-assisted sol-gel method at 800℃, and the cathode materials (LiAl0.05Mn1.95O4) with d