材料期刊网

Possible Phenomena of Stochastic Behaviour of Shear Deformed Aluminum

S.V.Alekseev S.G , Psakhie V.E.Panin Institute of Strength Physics and Materials Science of the Russian Academy of Sciences , Siberian Branch.Tomsk , 634055 , Russia

材料科学技术（英文）

The influence of shear deformation on the behaviour of Mg and Zn impurities as well as self-interstitial atoms in Al was studied using molecular dynamics method.The profilies of potential relief were calculated in directions of possible migration of interstitials.It was found that under load- ing the location of interstitial atoms may be undefined.It means that the system of determined parti- cles may go into stochastic regime of behaviour.

关键词: stochastic behaviour , null , null

Explanations of the optical spectra and g factor for V3+ ions in ZnX (X = S, Se, Te) crystals

Physica B-Condensed Matter

This paper presents a cluster approach for the calculations of the absorption band positions and the g factor of d(2) tetrahedral cluster. In the approach, the different modifications of e and t(2) orbitals of d electrons and the contribution from the spin-orbit coupling of ligands to the EPR g factor due to the mixing of d(2) ions with the ligands are considered. The calculated band positions and g factor for ZnX : V3+ (X = S, Se, Te) crystals show good agreement with the observed values by using only two adjustable parameters. The contribution from the spin-orbit coupling of ligands to the g factor is discussed. (C) 1998 Elsevier Science B.V. All rights reserved.

关键词: crystal- and ligand-field theory;optical spectra;electron paramagnetic;resonance;spin-orbit coupling;V3+ ZnX (X = S, Se, Te);vanadium centers;znte crystals

PS/粉末SBR-g-S共混体研究Ⅱ.粉末SBR-g-S的相结构及其与PS的相容性

王炼石 , 周奕雨 , 夏新江

高分子材料科学与工程

测定了SBR-g-S的接枝率,用TEM检测了粉末SBR-g-S(PR)的相结构.用DSC测定了PS/PR共混体的Tg,研究了PS/PR共混体的相容性.结果发现,在接枝率为32.6%的粉末非交联SBR-g-S(PR1)的相结构中SBR为连续相,在连续相中均匀分布着直径约0.01 μm的PS微区;PS为细胞状分散相,粒径1～5 μm,分散相含有SBR包藏物.在接枝率为8.5%的粉末交联SBR-g-S(PR2)的相结构中PS为连续相,SBR为分散相,分散相粒径约0.3 μm.共混体PS/PR1的相容性优于PS/PR2.SBR在PS富相中有较高的含量是导致PS/PR1共混体在冲击断裂时发生剪切屈服的主要原因.

关键词: 粉末SBR-g-S , 相结构 , PS/粉末SBR-g-S , 共混体 , 相容性

CS-KPS复合体系引发S-g-PAM反相胶乳的研究

卢绍杰 , 刘瑞贤 , 孙希明 , 卫乃勤 , 杨光中

高分子材料科学与工程

以K2S2O8为引发剂,研究了在反相乳液中合成淀粉接枝聚丙烯酰胺共聚物(S-g-PAM),实验证明,加入少量铈离子组成复合体系,对提高反应速率、接枝率和接枝效率起到显著的促进作用.文中对硫酸铈-过硫酸钾(CS-KPS)体系的用量及反应影响因素进行了探讨.

关键词: 淀粉接枝 , 丙烯酰胺 , 复合引发体系 , 反相胶乳

Q相-C2S系统中V2O5对β-C2S稳定性的研究

杨利群 , 祝名伟 , 封汉昌 , 徐先宇

材料科学与工程学报 doi:10.3969/j.issn.1673-2812.2000.03.016

本文研究了Q相-C2S配合料中V2O5对β-C2S的稳定性问题.结果表明,微量V2O5可以稳定β-C2S,使Q相与β-C2S可在常温下共存;Q相-C2S配合料中V2O5/C2S在0.8～1.0%的范围内V2O5稳定β-C2S的效果最好.

关键词: Q相 , C2S , V2O5 , CaO-MgO-Al2O3-SiO2系统

Explanation of the EPR g factors for Co2+ impurities in trigonal Cd2P2S6 crystal

Physica B-Condensed Matter

By extending the theory of Abragam and Pryce, the formulas of EPR parameters g and g(perpendicular to) for 3d(7) ion in trigonal octahedral crystals are established from a cluster approach. In these formulas, not only the configuration interaction effect, but also the covalency effect are considered and the parameters related to both effects and the trigonal distortion are determined from the optical spectra and the structural data of the crystal under study. Based on these formulas, the g(parallel to) and g(perpendicular to) of Cd2P2S6: Co2+ crystal are reasonably explained from its structural data. The relationship between the sign of Deltag (= g(parallel to) - g(perpendicular to)) and the trigonal distortion (elongated or compressed) of ligand octahedron, which is opposite to that obtained in the previous paper, is given and the results are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.

关键词: electron paramagnetic resonance;crystal- and ligand-field theory;trigonal distortion;Co2+;Cd2P2S6;superposition model;transition;complexes;ion

ER70S-G焊丝焊接工艺性能的研究

黄治军 , 王玉涛 , 胡家国

钢铁研究

为提高气保焊丝的焊接工艺性能,选用不同化学成分的ER70S-G焊丝进行焊接工艺试验。当焊丝含某种元素X质量分数为0.09%、w（Mn）为1.50%及w（Si）为1.0%时,CO2气体保护焊接飞溅极少,但焊缝宽高比较小,为3.5;当焊丝含某种元素X质量分数为0.01%、w（Mn）为1.70%及w（Si）为0.8%时,CO2气体保护焊接飞溅较少,焊缝宽高比较大,为4.5,显示出很好的焊接工艺性能。结果表明,焊丝的成分对气保焊缝的成形有很大的影响,在某种元素X质量分数、w（Ti）及w（Si）/w（Mn）比适当时,可得到焊接飞溅小、焊缝成形佳的焊接工艺性能。

关键词: ER70S-G , 气保焊 , 飞溅 , 成形

含钛焊丝钢ER70S-G夹杂物演变分析

刘善喜 , 张彩军 , 吕达 , 马德刚 , 李硕

钢铁钒钛 doi:10.7513/j.issn.1004-7638.2016.05.008

为开发含钛焊丝钢ER70S-G,对其冶炼过程中夹杂的数量、尺寸和类型进行研究.研究发现:在精炼过程中,钢中当量直径夹杂物的数目呈现逐渐降低的趋势;到中间包时,当量直径(5μm)夹杂物数目已经从包样的19.78个/mm2减少到1.66个/mm2;精炼过程夹杂物的平均直径呈逐渐降低的趋势,平均直径为2.05 μm;精炼初期,钢中夹杂物类型主要是MnO-SiO2夹杂,到加钛铁前,钢中的主要夹杂物转变为CaO和MgO,从加钛铁后到中间包期间,Al2O3-Ti2O3-MgO系夹杂是钢中的主要夹杂物.

关键词: 含钛焊丝钢 , 夹杂物 , 数量 , 尺寸 , 类型

Relationship between the brittlement susceptibility and H permeation current for UNS g11180 steel in 5% NaCl solution with H2S

材料科学技术（英文）

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was, studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydrogen permeation technique. The results reveal different cracking mechanism and H permeation current (I-H) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 steel in 5% NaCl solution with H2S was evaluated by the permeation current (I-H, mu A), which depends on the concentration (c x 10(-6)) of H2S by the equation: I-H = 8.525 x c(0.7249). It is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.

关键词: cracking

Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5% NaCl Solution with H_2S

Xueyuan ZHANG and Yuanlong DU(State Key Lab. for Corrosion and Protection , Institute of Corrosion and Protection of Metals , Chinese Academy of Sciences , Shenyang 110015 , China)

材料科学技术（英文）

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydro gen permeation technique. The results reveal different cracking mechanism and H permeation current (IH) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 Steel in 5% NaCl solution with H2S was evaluated by the permeation current(IH, μA), which depends on the concentration (c×10-6) of H2S by the equation:IH = 8.525 ×c0.7249. lt is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.

关键词: