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Phase and microstructure of TbCu7-type SmFe melt-spun powders罗阳,于敦波,李红卫,庄卫东,李扩社,吕彬彬National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals... phase and microstructure were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The Th2Zn17-type structure of the as-cast state changed......
to the lower one, the hcp and fcc phases can be directly transformed from the glassy structure without undergoing the metastable bcc phase. The Ostwald’s "step rule" is impactful during the isothermal...] employing a long-range potential model also demonstrated that the metastable bcc phase can be easily obtained rather than the equilibrium fcc structure. In fact, some metals[10-12] have been......
effects on mechanical and magnetic properties.The excellent strength-ductility combination will be achieved as the disappearance of σ phase and formation of FCC phase.As for the magnetic properties,the volume fraction of BCC phase plays a major role in determining its saturation magnetization.When the volume fraction change of BCC phase is not evident,the higher volume fraction of FCC phase......
; Abstract: A thermodynamic assessment of the Cu-Cd system has been carried out by CALPHAD technique. The liquid phase, FCC_A1(Cu... compounds, including β(Cu2Cd), γ(Cu4Cd3), δ(Cu5Cd8) and ε(Cu3Cd10). The δ phase is described by a two-sublattice model and the other three intermediate phases are treated as stoichiometric phases......
Co-Al-Mo体系fcc相的扩散动力学研究张杨1,王杨1,鲁晓刚1,21. 上海大学材料科学与工程学院2. 上海大学材料基因组工程研究院摘 要:采用扩散偶技术制备了10对扩散偶.基于Whittle-Green方法并根据误差函数展开式(ERFEX)拟合电子探针显微分析测定的成分-距离曲线结果,计算得到合金元素Al和Mo在fcc Co-Al-Mo三元合金中的互扩散系数,进而研究了1 273和1 473 K时Al和Mo元素在Co-Al-Mo体系fcc合金中的扩散行为.研究结果表明:Al在Co-Al-Mo体系fcc合金中的扩散比Mo快,且Mo的主互扩散激活能比Al高1 455 J/mol.此外,Al和Mo含量的变化均会显著影响Al在Co-Al-Mo体系fcc合金中的互扩散系数,但对Mo元素的主互扩散系数影响......
assessment of the Cu-Ni-Sn ternary system was carried out by the CALPHAD (calculation of phase diagrams) method. The Gibbs free energies of liquid and fcc phases were described by the subregular solution.... Key words: Cu-Ni-Sn ternary system; phase diagram; CALPHAD method; thermodynamic calculation Cu-Ni-Sn系合金由于具有高强度, 高导电性和良好的耐蚀性以及焊接性能, 在电子材料领域中得到了广泛使用. 特别是利用高Ni, 高Sn成分侧低温时出现的fcc相的Spinodal分解......
junctions has fcc structure whose lattice parameter is a=0.559nm. A dislocation is observed in this phase. It is also found that a large number of the block-shaped Nd-rich phases with hcp structure... at the three-grain junctions and two-grain boundaries. Based on the SAD patterns, the O-rich phase was identified to be face-centered cubic (fcc) structure that is indexed as [011]fcc, which is similar......
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FCC装置先进控制发展概况张潮生中石化北京设计院!100011摘 要:目前在许多炼厂的FCC改造工程中应用了DCS,但其运行功能主要限于基本调节控制,DCS的先进功能没有得到充分利用,改进DCS的运行和效益一个重要途径是开发和实现先进控制方法.本文介绍了在改造FCCO过程中所使用先进控制技术.关键词:先进控制;优化;分散控制系统;流化催化裂化装置;......