电沉积Fe、Ni基合金箔的组织形貌及磁性能

采用电沉积方法,制备了铁箔、铁基合金(Fe-Ni,Fe-Co,Fe-Ni-Co)箔、镍箔、镍基合金(Ni-Fe)箔,利用扫描电镜观察了金属箔的组织形貌,直流开路磁场下测定了电沉积金属箔的基本磁性能.实验表明:电沉积铁基合金箔晶粒小于10 μm,电沉积镍基合金箔晶粒大小在2 μm左右; 电沉积Fe-Ni合金箔是一种性能良好的软磁材料,其基本磁性能优于传统熔铸-轧制坡莫合金1J79.     

Study of microstructure and magnetic properties of electrodeposited nanocrystalline CoFeNiCu thin films

In this study the nanocrystalline CoFeNiCu thin films were electrodeposited from baths containing sodium citrate as a complexing agent and pH of around 5. Electrodeposition conditions were changed in order to achieve optimum soft magnetic properties which are required for new generation magnetic head core. SEM, EDS, XRD and VSM were used for characterization of the deposited films. The SEM micrographs of the deposited films exhibited no micro-voids and more uniform surface morphology compared with films electroplated from conventional baths (with low pH and no additives). According to X-ray diffraction patterns, the films electroplated at current densities lower than 4 mA/cm² showed FCC (Cu) phase structure, and other films exhibited BCC (Fe) and/or FCC (Co) phases. Calculating grain size of the films by using Scherrer equation showed that all the coatings were nanocrystalline and double phase films had lower average grain size in comparison with single phase films. The VSM results demonstrated that the coercivity of the nanocrystalline films dramatically reduced with decreasing grain size and followed D⁶ law. However, grain size had no effect on the saturation magnetization, whereas the chemical composition significantly affected saturation magnetization of the films. The results also indicated that in order to obtain films with low coercivity and high saturation magnetization, the nickel and copper contents of the deposits must not exceed 12 and 5 at.%, respectively.     

Mechanical flange forming in steel and copper foil

Flange forming is a process which is wide spread in macro range for blanks with thicknesses from less than 1?mm up to several millimeters. Flange formed geometries are used as preforms for threads but also as device to give guidance and contact face to bolts and axles in sheet metal. A great advantage of flange forming compared to other machining processes is low process cycle time combined with high material utilization. Thus, a reasonable repertoire of knowledge has been gained for flange forming in macro range. Due to ongoing miniaturization of today??s products, flange forming is an interesting process applicable in micro range as well whereas size effects do not generally allow transfer of process limits from macro to micro range. Therefore the maximum flaring ratio for flange forming in micro range for sheet metal foil of 10?C25???m for a stainless steel 1.4301 and Copper E-Cu58 is investigated and compared with results in macro range. It is shown that the maximum flaring ratio decreases with decreasing sheet metal thickness. The resulting flange heights of experiments are compared with theoretical estimations which show a good accordance.     

AISI304不锈钢双辊连铸薄带的组织性能

测量了双辊薄带连铸机生产的AISI304连铸薄带的力学性能,采用光学显微镜、扫描电镜和透射电镜观察了连铸薄带的微观组织结构,分析了微观组织结构对性能的影响.结果表明,连铸薄带内部为铸态组织,二次枝晶间距平均值为6.7μm,细小的铸态组织决定了薄带的最终组织细化和成分均匀;快速冷却有助于形成球形夹杂物,直径500～700 nm,较小的球形夹杂物能够钉扎位错;连铸薄带内析出粒子的直径20～100 nm,这种微小析出能够产生沉淀强化作用;薄带组织中大量位错、层错和孪晶的存在一定程度提高了连铸薄带力学性能.     

镀银铜箔平行微隙电阻焊接头组织与性能

研究了0.1 mm厚镀银铜箔与纯铜箔平行微隙电阻焊接头的微观组织和力学性能,分析了不同参数对接头力学性能的影响,利用扫描电子显微镜对典型接头界面处的微观组织特征进行了分析. 结果表明,焊点连接面处组织致密;连接面由富银相和富铜相组成的两相区和只有富铜相的单相区组成,焊接温度达到了银的熔点,其连接机理与钎焊类似;试验所用参数范围内,焊点的最大剪切抗力达到了59 N,焊接功率和焊接时间对焊点性能的影响较大,而电极压力的影响较小.     

Nanocrystalline electrodeposited Ni: microstructure and tensile properties

The microstructure of commercially available nanocrystalline (nc) electroplated Ni foils is studied by means of X-ray diffraction and transmission electron microscopy. It is shown that the microstructure is inhomogeneous and batch-dependent. Tensile properties at strain rates between 10⁻⁵ and 10³ s⁻¹ are studied and compared with the results of coarse-grained Ni. Data on strength, strain-rate sensitivity and work hardening are presented. At the highest strain rates, shear banding with local grain growth is observed in the nc structure. It is also suggested that the differences found in nc Ni for 3 and 20 mm tensile specimens are the size effects related to the inhomogeneous microstructure.     

Changes in the tensile strength and fracture mode with thickness of electrodeposited copper foil

The tensile strength and fracture mode changed with thickness of copper foil obtained from an acid copper sulfate bath under a same electrodeposition condition. The tensile strength decreased with increasing foil thickness due to an increase in average grain size of the foil. The tensile fracture mode changed from fractures normal to tensile axis to inclined fractures with increasing film thickness. The phenomena have been discussed based on a hardness distribution along the thickness and the local necking and fracture strains.     

Structure and mechanical properties of iron foil electrodeposited in super gravity field

The effects of super gravity field on the structure and the mechanical properties of iron foils electrodeposited were investigated by scanning electronic microscopy (SEM), X-ray diffraction (XRD) and atomic force microscopy (AFM). The results showed that the iron foils with finer grains and smoother surfaces were obtained in the super gravity field. The roughness was reduced from 21 nm to 6 nm with the increasing gravity coefficient (G) from 1 to 354. The preferred orientation of (110) plane was inhibited by the super gravity field, which may be due to the effect of the enhanced hydrogen evolution reaction on the surface energy of the iron's various crystal planes in the super gravity field. Consequently, both hardness and tensile strength were improved for the iron foils deposited in the super gravity field. The tensile strength was increased from 264 MPa to 719 MPa, and the hardness was increased from 176 Hv to 478 Hv when G value increased from 1 to 354.     

海因环氧树脂固化铜尾矿的力学性能及微观结构演变（英文）

基于强度和微观试验,系统研究海因环氧树脂掺量和养护龄期对铜尾矿试样力学性能及微观结构的影响规律。结果表明,当海因环氧树脂掺量为30%(质量分数)时,固化体试样强度达到20.84 MPa。当海因环氧树脂掺量为10%(质量分数)的固化体的养护龄期为7和14 d时,其强度分别为6.33和6.67 MPa,均满足其作为基础填料和建筑材料的要求。微观试验结果表明,随着海因环氧树脂掺量的增加,团粒化作用加强,固化体孔隙减少,从而大大提高了固化体强度。     

EB-PVD制备的Ni-Cr-Al-Y高温合金箔力学性能

采用一种新型的制备工艺--电子束物理气相沉积(EB-PVD),制备厚度为0.2 mm的Ni-Cr-Al-Y高温合金箔材,并采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)等测试手段研究了Ni-Cr-Al-Y高温合金的微观组织.结果表明,制备态的样品中存在柱状晶,这是由于制备过程中晶粒长大方式所导致的.经过760℃,16 h真空热处理后,柱状晶转变为等轴晶,并析出γ＇相.拉伸断口的SEM形貌表明,由于柱状晶之间组织疏松,结合较差,制备态样品沿柱状晶晶界发生脆性断裂,而热处理态样品的断口为典型的韧性断口.力学性能的测试结果表明,经过适当的热处理后,Ni-Cr-Al-Y高温合金的室温和高温力学性能同制备态时相比,有明显的改善.在700℃时,热处理态样品抗拉强度为587.6 MPa,应变为11.3%.     

电化学沉积Nd掺杂ZnO薄膜的结构和光学性质的研究

用电化学沉积方法制备出了Nd掺杂的ZnO薄膜,并研究其结构和光学性质。X-射线衍射谱的结果表明Nd3 替代Zn2 进入到ZnO晶格中,并没有引起杂相的出现。吸收谱的分析表明,随着掺杂浓度的增大,吸收峰向短波长方向移动 ,即发生蓝移。光致发光谱的结果表明随着Nd3 掺杂浓度的增大,紫外峰强度减小,可见光部分强度增大了。     

热轧带状组织对冷轧双相钢组织性能的影响

研究了不同热轧卷取温度下带状组织的变化对冷轧连退双相钢组织性能的影响,分析了热轧组织的遗传性对连退后马氏体组织的影响,以及弥散分布的马氏体与连续分布的马氏体对成品力学性能的影响。结果表明,热轧卷取温度为550 ℃时,带状组织比其他卷取温度下的带状组织有所改善,得到的冷轧连退组织中的马氏体比较弥散,弥散分布的马氏体要比连续分布的马氏体具有更好的塑性指标。     

Mechanical properties of hot rolled 2519 aluminum alloy plate

1　INTRODUCTIONThemainadvantageof 2 5 19aluminumalloyisitsspecificstrengthandthereforeitisconsideredasagoodchoiceforaviationandshippingindustry .How ever,theseapplicationsmayberestrictedby poorcharacteristicssuchasresistancetostresscorrosioncracking ,strengthandplasticity .Thesecharacteris ticsdependintensivelyonthedistributionofthesec ondphaseparticleandthesizeandshapeofgrainsthataredeterminedby proces sing andheattreat ment.Stresscorrosioncrackingisthetypeofattackinwhichatensileandacorr…     

V、N、Nb微合金化对薄板坯连轧带钢组织和性能的影响

在试验室模拟薄板坯连铸连轧过程，板坯均热后被轧制到7mm厚并通过控冷来模拟辊道冷却和带钢的缓慢卷取过程。本文选用低碳钢，研究了V、N、Nb微合金化对其组织和性能的影响。通过试验证明在V-N钢中加入Nb对钢的强化机制有较大影响，使V-N-Nb钢中的析出强化增大，这表明V-N-Nb微合金化可充分地发挥微合金元素在钢中的析出强化作用，析出强化对屈服强度的贡献比V-N微合金化提高17MPa。     

V、N、Nb微合金化对薄板坯连轧带钢组织和性能的影响

在试验室模拟薄板坯连铸连轧过程,板坯均热后被轧制到7mm厚并通过控冷来模拟辊道冷却和带钢的缓慢卷取过程.本文选用低碳钢,研究了V、N、Nb微合金化对其组织和性能的影响.通过试验证明在V-N钢中加入Nb对钢的强化机制有较大影响,使V-N-Nb钢中的析出强化增大,这表明V-N-Nb微合金化可充分地发挥微合金元素在钢中的析出强化作用,析出强化对屈服强度的贡献比V-N微合金化提高17MPa.     

退火工艺对1100铝箔组织及性能的影响

采用显微硬度计、大型偏光显微镜、MTS力学性能试验机和BCS-30D通用板料成形性试验机等设备，研究了成品退火工艺对冷轧1100铝箔再结晶过程中显微组织、力学性能和成形性能的影响规律。结果表明，无中间退火工艺的冷轧1100铝箔的再结晶起始温度为220℃，终止温度为320℃，铝箔在成品退火温度为350℃时，获得稳定的最佳综合性能，σb≥110MPa，δa≥25％，n≥035，IE≥8mm，并据此对现场生产工艺进行了调整。同时对退火过程中的强韧化机理进行了探讨。     

Effect of annealing temperature on microstructure,texture and properties of molybdenum foil

The microstructure, texture and mechanical properties of 0.06 mm thick molybdenum foil after annealing at different temperatures were studied by micrograph and EBSD analysis. The results show that the grains of the cold-rolled molybdenum foil along the rolling direction are fibrous. As the annealing temperature increasing from 750 °C to 1000 °C, the average layer thickness of these fibrous grains gradually grows. And the relative frequency of low-angle grain boundaries increases, while the relative frequency of high-angle grain boundaries decreases. Also, the main texture of the unidirectional-rolled and annealed molybdenum foils is {112}〈110〉 which content continuously increase to 62% till 1000 °C. Therefore, the strength of RD, TD and 45°RD direction decreases but the elongation increases. During these processes, the mechanism includes classical nucleation and coarsening of subgrain and with annealing temperature rising, the latter dominates the recrystallization process. After annealing at 1050 °C, the molybdenum foil undergoes secondary recrystallization. The grain boundary distribution becomes diffused and the main texture changes into {001}〈110〉, which the fraction is as high as 96%, thus, the mechanical properties of RD, TD and 45°RD exhibit sharp decrease simultaneously.     

冷却工艺对热轧V微合金化钢板组织性能的影响

本文通过热模拟试验, 分析了不同加热温度对V微合金化510 MPa级钢板原始奥氏体晶粒度的影响规律, 并通过工业试验分析了冷却工艺和奥氏体晶粒尺寸对钢板组织和性能的影响。试验结果表明: 当加热温度为1 230 ℃, 卷取温度一定时, 可以通过控制中间温度得到等轴铁素体或针状铁素体组织。当加热温度为1 160 ℃时, 随着终轧温度、中间温度和卷取温度的变化, 钢板组织和性能变化不明显。     

Mn含量对热轧TWIP钢组织性能的影响

利用室温冲击试验、拉伸试验、扫描电镜和透射电镜等研究了Mn含量对热轧孪生诱发塑性(TWIP)钢显微组织和力学性能的影响.结果 表明:随着Mn含量的增加,试验钢的冲击吸收能量增加,抗拉强度逐渐降低,伸长率有所增加,孪晶的尺寸也得到细化.     

3003铝合金双零箔的研发

对3003铝合金熔体彻底除气、除渣,控制铸轧坯料的冶金质量;采取610℃36 h均匀化处理,控制坯料的内部组织;在箔轧过程中合理安排轧制道次和退火工艺,控制箔料的加工硬化程度。生产出了力学性能优于1235铝双零箔的3003铝合金双零箔。