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FORMATION OF AMORPHOUS GE-S SEMICONDUCTOR ALLOYS BY MECHANICAL ALLOYING

Amorphous Ge1-xSx(x=0.61, 0.67, and 0.72) semiconductor alloys have been found formed by ball milling of powder mixtures of elemental Ge and S. The amorphization process and the ball-milled products have been investigated by x-ray diffraction, transmission electron microscopy, and Raman scattering. The results show that amorphous Ge-S alloys may form in a self-heating reaction, driven by the large heat of formation of amorphous and/or liquid Ge-S alloys. The structure of mechanically alloyed amorphous Ge-S alloys is similar to but not exactly identical with that of rapidly cooled amorphous Ge-S alloys. The amorphization transition mechanism reported is believed to be suitable for preparing other amorphous semiconductor alloys with similar thermodynamic conditions.

关键词: magnetic-properties;ni-zr;amorphization;powders;transition;interdiffusion;germanium;systems;glasses;metals

VIM法中采用CaO坩埚对Ni基高温合金脱S的影响

牛建平 , 杨克努 , 管恒荣 , 胡壮麒

机械工程材料 doi:10.3969/j.issn.1000-3738.2002.02.002

研究了使用CaO坩埚在VIM法精炼Ni基高温合金过程中S的变化规律及加Al对脱S的影响.试验表明:当CaO坩埚中的含S量高于液态金属中的含S量时,坩埚中的S将进入金属液中而使液态金属增S.加入0.5%的Al经30min精炼后可以使液态金属中的S含量从30mg/kg降低至小于5mg/kg.对CaO坩埚内壁的XRD及成分分析表明,加Al脱S是由于在CaO坩埚壁和金属液间形成低熔点的具有很强脱S能力的3CaO@Al2O3渣.

关键词: VIM , CaO坩埚 , Ni基高温合金 , 脱S

Thermodynamic Behaviour of Fe-S-RE,Fe-Csat.-S-RE,Ni-S-RE,Cu-S-RE Solutions

Ting DU Longmei WANG Yeming WU Yuqing ZHANG Aisheng LIU Central Iron and Steel Research Institute , Beijing , 100081 , China

材料科学技术（英文）

The temperature dependences of the equilibrium constants for the reactions RES_((S))=[RE]+[S]. (RE=Ce,La,Nd,Sm,Y),of the standard Gibbs energies for the RES formed and of the interaction coefficients between RE elements and S for the Fe-base,Ni-base and Cu-base solutions are sum- marized.

关键词: thermodynamics , null , null , null , null

Corrosion behaviour of carbon steel in different concentrations of HCl solutions containing H(2)S at 90 degrees C

Corrosion Science

The corrosion behavior of SAE-1020 carbon steel in H(2)S-containing solutions with different concentration of HCl at 90 degrees C was investigated by weight loss, electrochemical measurements, SEM and XRD analysis. The results showed that the corrosion rate of carbon steel increased with increasing HCl concentration. Uniform corrosion was found on the carbon steel surface in H(2)S + HCl solutions, while corrosion cavities were observed in the solution only containing H(2)S. The ratio of Faradaic process of total corrosion process increased with the increase of HCl concentration. The corrosion products were solely composed of mackinawite in the H(2)S-containing solutions with or without HCl. (c) 2011 Elsevier Ltd. All rights reserved.

关键词: Steel;Weight loss;EIS;SEM;XRD;Acid corrosion;acidic chloride solutions;hydrogen-sulfide;aqueous-solution;iron;sulfides;electrochemical-behavior;media;dissolution;impedance;polarization;environments

Quantum transport of Au-S-S-Au nanoscale junctions

Applied Physics Letters

Transport in S(2) molecules sandwiched between Au electrodes is investigated with a combination of density functional theory and the non-equilibrium Green's function method. We consider four different configurations and find that their conductances are related to the details of the bonding geometry. When S(2) connects to pyramidal-shaped electrodes at the top site, the transmission is governed by a resonance and is strongly affected by the bias. In contrast, the transport of the remaining three configurations is through several closely spaced broad molecular orbitals, and the transmission coefficient is almost flat around the Fermi level. (C) 2012 American Institute of Physics. [doi:10.1063/1.3665614]

关键词: conductance;molecule

恒位移加载条件下X65管线钢H2S应力腐蚀研究

孙新阁 , 霍立兴 , 张玉凤

腐蚀学报（英文）

采用楔形张开加载恒位移实验研究了X65管线钢在H2S溶液中的应力腐蚀开裂行为，并得出了X65管线钢母材、焊缝和热影响区的临界应力强度因子KISCC分别为55.7093 MPa•m 1/2、33.3189 MPa•m1/2和38.0711 MPa•m1/2；平台处的裂纹扩展速率da/dt分别为3.38×10－9m/s、3.5×10－9 m/s和3.5×10－9m/s.研究结果还表明，焊缝比母材具有更高的应力腐蚀敏感性. 

关键词: 管线钢 , null , null

恒位移加载条件下X65管线钢H2S应力腐蚀研究

孙新阁 , 霍立兴 , 张玉凤

腐蚀学报（英文） doi:10.3969/j.issn.1002-6495.2006.03.004

采用楔形张开加载恒位移实验研究了X65管线钢在H2S溶液中的应力腐蚀开裂行为,并得出了X65管线钢母材、焊缝和热影响区的临界应力强度因子KISCC分别为55.7093 MPa·m1/2、33.3189 MPa·m1/2和38.0711 MPa·m1/2;平台处的裂纹扩展速率da/dt分别为3.38×10-9m/s、3.5×10-9m/s和3.5×10-9m/s.研究结果还表明,焊缝比母材具有更高的应力腐蚀敏感性.

关键词: 管线钢 , 临界应力强度因子 , 裂纹扩展速率

EQUILIBRIUM OF Mg-S IN Ni MELTS

WANG Conghua HAN Qiyong University of Science and Technology Beijing , Beijing , China WANG Conghua Faculty of Physical Chemistry of Metallurgy , University of Science and Technology Beijing , Beijing , China

金属学报(英文版)

The equilibrium of Mg-S in Ni melt was studied by the method of vapour equilibrium in a sealed chamber.At 1530℃ the equilibrium constant of the reaction MgS_(s)=Mg_(Ni)+S_(Ni)and the activity interaction coefficient were determined as K_(MgS)=6.76×10~(-5)and e_S~(Mg)=-9.1.

关键词: Equilibrium constant , null , null , null , null