Fe－Dy非晶膜晶化过程中结构及磁性变化SCIEI

用真空双源蒸镀法在ＮａＣｌ和Ｓｉ单晶衬底上制备Ｆｅ，Ｄｙ成分调制多层膜．研究了非晶膜晶化过程，等温退火后多层膜结构及磁性变化。结果表明，在２００℃以下退火，其沉积态非晶和成分调制结构几乎不变；３００℃开始晶化，首先出现Ｆｅ晶核，随温度升高，Ｆｅ，Ｄｙ逐步晶化，６００℃全部形成晶态ｂｃｃ－Ｆｅ和ｈｃｐ－Ｄｙ．饱和磁化强度Ｍｓ对非晶Ｆｅ，Ｄｙ膜晶化时Ｆｅ晶核的形成十分散感，而只有Ｆｅ晶粒的长大才导致矫顽力Ｈｃ增加．     

电子束加热时Fe—Dy多层膜的稳定性

用真空双源蒸镀法在ＮａＣｌ单晶衬底上制备了金属Ｆｅ－Ｄｙ（镝）多层膜，用透射电镜（ＴＥＭ）分析结构。结果表明，当Ｆｅ单层厚度≥２．４ｎｍ时，Ｆｅ为ｂｃｃ结构，无明显择尤取向特征；Ｄｙ单层厚度＜２．４ｎｍ时，Ｄｙ为非晶态，在透射电镜样品台上经１００ＫＶ加速的高强度电子束流加热多层膜，非晶Ｄｙ首先晶化变为ｈｃｐ结构，随加热时间的延长，晶粒长大。１５０Ｓ时Ｆｅ晶粒尺寸约３００ｎｍ，此时出现了铁镝氧化物。     

电子束加热时Fe－Dy多层膜的稳定性

用真空双源蒸镀法在ＮａＣ１单晶衬底上制备了金属Ｆｅ－Ｄｙ（镝）多层膜，用透射电镜（ＴＥＭ）分析结构。结果表明，当Ｆｅ单层厚度≥２．４ｎｍ时，Ｆｅ为ｂｃｃ结构，无明显择尤取向特征；Ｄｙ单层厚度＜２．４ｎｍ时，Ｄｙ为非晶态。在透射电镜样品台上经１００ｋｖ加速的高强度电子束流加热多层膜，非晶Ｄｙ首先晶化变为ｈｃｐ结构，随加热时间的延长，晶粒长大。１５０ｓ时Ｆｅ晶粒尺寸约３００ｎｒｎ，此时出现了铁镝氧化物。     

Fe／Y非晶多层膜的晶化反应及相演化研究

由Ｍｉｅｄｅｍａ半经验公式计算的Ｆｅ／Ｙ二元系自由能图，及退火时Ｆｅ／Ｙ非晶多层膜晶化过程的ＸＲＤ分析结果得出：Ｆｅ、Ｙ晶态自由能低于初始非晶态为晶化提供驱动力，形核势垒及临界晶核尺寸控制晶化反应的相选择。     

Ar~（＋）混合Fe－Dy多层膜的结构及性能

用真空双源蒸镀法在Ｓｉ单晶衬底上制备了Ｆｅ，Ｄｙ原子数比为３：２的Ｆｅ─Ｄｙ成分调制多层膜．用ＡＥＳ、ＲＢＳ、Ｘ射线衍射（ＸＲＤ）以及磁性测量分析了Ａｒ~（＋）混合前后Ｆｅ─Ｄｙ多层膜的相交．Ａｒ~（＋）离子注入能量１１０ｋｅＶ，剂量５×１０~（１５）─１×１０~（１７）／ｃｍ~２．结果表明，注入剂量为１×１０~（１７）／ｃｍ~２时，Ｆｅ，Ｄｙ完全混合，并且由晶态的Ｆｅ，Ｄｙ完全转变为Ｆｅ_（６０）Ｄｙ_（４０）（近似于该化学配比）的非晶态合金，随Ａｒ~（＋）注入量的增加，Ｆｅ一Ｄｙ多层膜的Ｍ_ｓ下降，在剂量５０×１０~（１５）／ｃｍ~２时下降幅度最大。     

STRUCTURE AND PROPERTIES OF Fe-Dy MULTILAYER IMPLANTED WITH Ar~(+)

用真空双源蒸镀法在Ｓｉ单晶衬底上制备了Ｆｅ，Ｄｙ原子数比为３：２的Ｆｅ─Ｄｙ成分调制多层膜．用ＡＥＳ、ＲＢＳ、Ｘ射线衍射（ＸＲＤ）以及磁性测量分析了Ａｒ~（＋）混合前后Ｆｅ─Ｄｙ多层膜的相交．Ａｒ~（＋）离子注入能量１１０ｋｅＶ，剂量５×１０~（１５）─１×１０~（１７）／ｃｍ~２．结果表明，注入剂量为１×１０~（１７）／ｃｍ~２时，Ｆｅ，Ｄｙ完全混合，并且由晶态的Ｆｅ，Ｄｙ完全转变为Ｆｅ_（６０）Ｄｙ_（４０）（近似于该化学配比）的非晶态合金，随Ａｒ~（＋）注入量的增加，Ｆｅ一Ｄｙ多层膜的Ｍ_ｓ下降，在剂量５０×１０~（１５）／ｃｍ~２时下降幅度最大。     

Ar^（＋）混合Fe－Dy多层膜的结构及性能SCIEI

用真空双源蒸镀法在Ｓｉ单晶衬底上制备了Ｆｅ，Ｄｙ原子数比为３：２的Ｆｅ─Ｄｙ成分调制多层膜．用ＡＥＳ、ＲＢＳ、Ｘ射线衍射（ＸＲＤ）以及磁性测量分析了Ａｒ^（＋）混合前后Ｆｅ─Ｄｙ多层膜的相交．Ａｒ^（＋）离子注入能量１１０ｋｅＶ，剂量５×１０^（１５）─１×１０^（１７）／ｃｍ~２．结果表明，注入剂量为１×１０^（１７）／ｃｍ~２时，Ｆｅ，Ｄｙ完全混合，并且由晶态的Ｆｅ，Ｄｙ完全转变为Ｆｅ_（６０）Ｄｙ_（４０）（近似于该化学配比）的非晶态合金，随Ａｒ^（＋）注入量的增加，Ｆｅ一Ｄｙ多层膜的Ｍ_ｓ下降，在剂量５０×１０^（１５）／ｃｍ~２时下降幅度最大。     

添加Dy和Nb对纳米复合Pr2Fe14B／α—Fe永磁合金结构和磁性的影响

研究了添加Ｄｙ和Ｎｂ对纳米复合Ｐｒ２Ｆｅ１４Ｂ／α－Ｆｅ永磁合金形成、组织结构及磁性能的影响。研究表明,对于三元的Ｐｒ９Ｆｅ８５Ｂ６非晶带的晶化过程,在α－Ｆｅ相初始晶化之后,晶化最终产物Ｐｒ２Ｆｅ１４Ｂ＋α－Ｆｅ形成之前出现Ｐｒ２Ｆｅ２３Ｂ３亚稳相。而添加Ｄｙ或同时添加Ｄｙ和Ｎｂ后晶化过程不出现亚稳相。添加Ｄｙ和Ｎｂ元素显著地提高了纳米复合永磁合金的磁性能。     

Fe/RE(Dy,Y)非晶多层膜的晶化方式及晶化温度

通过比较Ｆｅ／ＲＥ非晶多层膜中所有成分范围内非晶合金形成焓△Ｈ＾ａｍ与固溶体形成焓△Ｈ＾ＳＳ得出,在△Ｈ＾ａｍ〈△Ｈ＾ＳＳ成分范围内的非晶与在△Ｈ＾ａｍ〉△Ｈ＾ＳＳ成分范围内非晶的晶化方式及晶化温度不同。这从理论上系统地解释了多层膜晶化为一个缓慢过程,没有确定的晶化温度。     

FeCuNbSiB系纳米微晶的形成及磁性──Ⅰ．纳米微晶的高密度形核

对Ｆｅ７８Ｓｉ１３Ｂ９、Ｆｅ７７Ｃｕ１Ｓｉ１３Ｂ９和Ｆｅ７４Ｃｕ１Ｎｂ３Ｓｕ１３Ｂ９三种非晶合金的晶化过程进行了ＤＴＡ热分析和在位动态电镜观察．在Ｆｅ７７Ｃｕ１３Ｂ９非晶的晶化前期阶段，发现了条状调幅结构，这被认为是Ｃｕ元素Ｆｅ基非晶基体中的Ｓｐｉｎｏｄａｌ分解的产物，富Ｃｕ区还可以作为α－Ｆｅ晶核的产床，导致了高密度形核．     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.     

Structural Optimization of Electromagnetic Swirling Flow in Nozzle of Slab Continuous Casting

During the slab continuous casting process, the flow field of molten steel in the mold plays a decisive role in the quality of the slab. In this paper, electromagnetic swirling flow in nozzle technology is proposed to control the flow field in mold.This technology can drive molten steel to rotate inside the submerged entry nozzle by electromagnetic force, thereby controlling the flow field. This research shows that it can reduce the impact of molten steel on the bottom of nozzle and partly reduce the negative pressure at the upper part of nozzle outlet which is even eliminated by optimizing the structure and angle of nozzle. The area of heat flux of the mold wall becomes larger, and the crest value of heat flux gets lower than that without swirling in nozzle and any nozzle optimization. The meniscus fluctuates smoothly, and the flow velocity at the top surface is within a reasonable range. The temperature field distribution in the mold is uniform which was beneficial to the growth of equiaxed crystal and decreased element segregation.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).