材料期刊网

THEREVERSSE TRANSFOR MATION OF THE STERSS INDUCEDεMIN FE 17MN 10CR 5SI 4NIALLOY

Q.S. Liu1 , 2 , 3) , L.C. Zhao3) , G.X. Dong2) and N.J. Gu1) 1) Heibei University of Technology , Tianjin 300130 , China 2) Tianjin Institute of Technology , Tianjin 300191 , China 3) Harbin University of Technology , Harbin 150001 , China

金属学报(英文版)

Theconstruction changinginthereversetransformation ofthestress induced εMin Fe 17 Mn 10 Cr 5 Si 4 Ni alloy is carefully inspected in transmission electron microscope, and then stress induced εM procedure of reverse transformation is analyzed. The behavior of reverse transformationisdissimilar when the organization of εMis different. The reversetransfor mation ofεM withtheshapeofsingle plateandstripisrelativelyeasy,anditsreversibilityincrystallographiciseasilytocarryout,fortheεM with multilayerstructure,thereversetrans formationtakes placein isolatedlayers, fortheεMthat grows well,thereversetransforma tion isrelatively difficult becauseofthe ductile harmonization between itsinternalorganiza tion structures.

关键词: stress induced εM , null , null

C+L波段掺铒光纤被动锁模激光器

许小言 , 许立新

连铸 doi:10.3969/j.issn.1007-5461.2016.05.006

提出并证明了一种宽光谱被动锁模掺铒光纤激光器,为光学频率梳和光纤飞秒脉冲的产生奠定了基础.基于非线性偏振旋转的锁模机理,该激光器在大的正常色散区合理地将C波段和L波段掺铒光纤结合,确保激光器具有C+L波段的增益谱覆盖.泵浦功率为350 mW时脉冲以基频4.32 MHz稳定地运转, 3 dB带宽为60 nm,20 dB覆盖了1522～1630 nm,实现了增益带宽内光谱的完全覆盖.这种利用增益拼接加宽光谱的方法可以有效避免光谱成分的非线性相位噪声,有利于进一步压窄脉冲.

关键词: 激光技术 , C+L波段 , 被动锁模 , 光纤激光器

细胞色素c在L-半胱氨酸自组装膜电极上的电化学行为

孙一新 , 王升富

应用化学 doi:10.3969/j.issn.1000-0518.2005.03.015

采用循环伏安法、交流阻抗谱探讨了L-半胱氨酸自组装膜修饰金电极表面细胞色素c(Cyt c)的电化学行为,Cyt c在该电极表面的平均吸附量Г=1.366×10-10 mol/cm2. 紫外-可见吸收光谱法和电化学方法证实,通过静电作用固定在L-半胱氨酸自组装膜电极上的Cyt c保持了良好的生物活性和电化学活性. 在低扫速时峰电流与扫速呈线性关系,表明Cyt c与电极之间是表面过程. 通过交流阻抗谱求得在细胞色素c/L-半胱氨酸膜修饰金电极上的标准异相电子迁移速率常数k0s为7.529×10-4 cm/s. 吸附到L-半胱氨酸自组装膜电极表面的Cyt c对H2O2的还原表现出良好的电催化效应,初步研究了电催化机理. Michaelis-Menten常数为Kappm=1.21×10-3 mol/L,与其它蛋白质相比,吸附在L-Cys/Au膜电极上的Cyt c对H2O2有较好的亲和力.

关键词: 细胞色素c , L-半胱氨酸 , H2O2 , 金电极

承钢公司成功试炼X70、C700L两钢种

钢铁

近日，承钢公司试炼管线钢X70、卷板C700L获成功，钢坯成分、气体含量、铸坯质量等指标均达到标准要求。管线钢X70是具有高强度、高韧性和良好焊接性能的高级别管线。提钒钢轧二厂在总结以往管线钢生产经验的基础上，于4月15日对X70钢组织试制，

关键词: X70 , 钢种 , 试炼 , 管线钢 , 气体含量 , 铸坯质量 , 焊接性能 , 生产经验

C u-Mg-A l层状超分子材料的制备及去除碘的研究?

郑劼 , 朱霞萍 , 李品 , 白德奎 , 李铭

功能材料 doi:10.3969/j.issn.1001-9731.2016.09.045

共沉淀法制备了C u-Mg-A l层状超分子化合物,X 射线衍射图谱和热重分析表征了材料的结构,并研究了材料对溶液中碘离子的吸附去除性能.制备的材料为具有层状结构的 C u-Mg-A l 的超分子化合物,具有结构“记忆效应”,层间可以吸附碘,层板上的铜对碘也有特异化学作用,增强材料对碘的吸附能力.在优化制备和吸附条件下,Cu-Mg-Al层状超分子化合物对碘离子的饱和吸附量为279．15 mg/g,远高于普通层状氢氧化镁铝的66．61 mg/g.材料可作为碘及放射性碘污染的吸附去除剂.

关键词: 层状金属氢氧化物 , 超分子 , 铜 , 碘 , 去除

Search for exotic events from the L3+C data

中国物理C

关键词:

（L12,D022）-TiAl3和L12-Ti（Al,Pt）3电子结构与光学性质第一性原理计算

段永华 , 孙勇 , 鲁俐

功能材料 doi:10.3969/j.issn.1001-9731.2013.24.016

基于密度泛函理论(DFT)的第一性原理赝势平面波方法,采用广义梯度近似(GGA),计算了立方结构 L12-TiAl3和 L12-Ti (Al,Pt)3及四方结构D022-TiAl3的电子结构与光学性质。计算结果表明L12-TiAl3和D022-TiAl3费米能级附近价带和导带主要是由Ti的3d 和 Al 的3p 轨道贡献,而 L12-Ti(Al, Pt)3费米能级附近价带和导带则主要是由Ti的3 d和Pt的6 s 轨道贡献；同时也计算了 L12-TiAl3、L12-Ti (Al,Pt)3和D022-TiAl3的介电函数、折射率、吸收系数和反射率等。

关键词: L1 2-Ti (Al,Pt)3 , 第一性原理 , 电子结构 , 光学性质

Synthesis and Characterization of Some Transition Metal Chelates of 5-(1-Hydroxy-6-Naphthylazo-3-Sodium Sulphonate) Thiobarbituric (L1) and Barbituric (L2) Acids

Nabil S. Youssef , K.H.Hegab

材料科学技术（英文）

Some transition metal chelates of two ligands L1 and L2 were prepared and characterized by elemental analysis. The IR and 1H NMR spectra of several chelates of two ligands L1 and L2 showed the involvement of the azo group in chelation with the transition metal ions, in most of the studied chelates, and that the two ligands L1 and L2 showed the involvement of the azo group in chelation with the transition metal ions, in most of the studied chelates, and that the two ligands L1 and L2 were coordinated either in the enol or the keto form. IR spetra also showed that Fe(III)-, Ni(II)-, Mn(II)-, VO(II)-L1 and Cu(II)-L2 chelates behaved in a bidentate manner, in contrast with the two (1:1) M:L cobalt chelates with the two ligands are tridentate. TG analysis indicated the presence of three to twelve water molecules of hydration eliminated on heating up to 150°C and one or two coordinated water molecules removed at 150-180°C. The octahedral structure is proposed for all the chelates, except Cu(II)-L2 and Ni(II)-L1 chelates which have square planar geometry, based on their electronic spectra.

关键词:

The ferromagnetic copper (II)-azido compound Cu(L)(2)(N-3)(2) (n) L=4-(dimethylamino)pyridine studied by first-principle calculation

Physica B-Condensed Matter

Cu2+ ions are doubly bridged by asymmetrical end-to-end (EE) azido groups in copper (II)-azido compound [Cu(L)(2)(N-3)(2)](n) [L = 4-(dimethylamino)pyridine]. The electronic structure of its ferromagnetic ground state has been calculated using the self-consistent full-potential linearized augmented plane wave method (FP_LAPW) based on the density functional theory (DFT). The result shows that spin distribution and ferromagnetic coupling in the title compound are dominated by the spin delocalization effect from Cu2+ ions toward the azido groups, but weak spin polarization effects also contribute to the magnetic coupling through the asymmetrical EE azido groups. (c) 2005 Elsevier B.V. All rights reserved.

关键词: [Cu(L)(2)(N-3)(2)](n);azido group;spin delocalization;end-to-end;magnetostructural correlations;magnetic-properties;molecular magnets;crystal-structure;on azido;antiferromagnetic;interactions;nickel(ii) complexes;dinuclear complex;bridges

First-principles investigation of 3d transition elements in L1(0) TiAl

Journal of Applied Physics

The effect of 3d transition elements (such as V, Cr, Mn, Fe, Co, and Ni additions) on material properties in L1(0) TiAl has been studied using the first-principles DMol and discrete variational method within the framework of the density-functional theory. The transfer energy calculation indicates that all these 3d elements show a tendency to substitute for Al sites in the stoichiometric TiAl alloy, with the increasing order V < Cr < Mn < Ni < Fe < Co. Our results show that the local distortion of crystal lattice around an impurity atom is nonuniform, and it is found that the important influencing factors on the local lattice distortion are the impurity atom size and the site preference. Based on the effects of the doped alloying elements on the structural parameters and mechanical properties, we conclude that the larger bond strength and the smaller axial ratio benefit the ductility. (c) 2007 American Institute of Physics.

关键词: alloying elements;site preference;electronic-structure;mn;substitutions;base alloys;compound;nb;deformation;occupancies;aluminides