纳米晶Fe72.5Cu1Nb1.5Mo1.5V1Si13.5B9合金的磁性能

报道了新开发的纳米晶Fe725Cu1Nb15Mo15V1Si135B9合金的综合磁性能。新合金的直流起始磁导率和矫顽力水平分别达到13×104和064Am-1。在Bm=03T,f=100kHz和Bm=02T,f=200kHz条件下,铁损分别为578kW·m-3和884kW·m-3,这可与纳米晶Fe735Cu1Nb3Si135B9合金的相比,但比优良的功率MnZn铁氧体H7C4的低得多。在Bmf=(10～40)T·kHz条件下,在f=(20～6000)kHz范围内,描述了铁损、相应幅值磁导率和动态矫顽力的行为     

Fe76.9Cu0.6Nb2.5Si13B7合金结构和性能的研究

本文研究了Fe76．9Cu0．6Nb2．5Si1387纳米晶软磁合金的晶化过程及软磁性能。Fe76．9Cu0．6Nb2．5Si1387纳米晶软磁合金具有优良的软磁性能：高饱和磁感应强度、高初始磁导率、低矫顽力、低损耗。本文中对损耗P进行了拟合分析，当Bm=0．1～0．7T、f=10～300kHz时，损耗P可近似地表示为：P=0．63f^1.72B^2m。我们采用晶化过程中电阻测量及X射线衍射方法研究了该合金的晶化过程，研究表明该合金在很宽的温度范围内进行退火处理都只存在单一的α-Fe(Si)析出相。     

高导磁纳米晶Fe_(73.5)Cu_1Nb_2V_1Si_(13.5)B_9合金的低频损耗行为

在 f=1 0 ～ 1 0 0 0Hz及Bm =0 1～ 1 0T的范围内 ,测量了具有高起始磁导率的纳米晶Fe73 5 Cu1Nb2 V1Si13 5 B9合金的总铁损。将总铁损分离为磁滞损耗、经典涡流损耗和过剩损耗之和 ,我们仔细地考查了每周低频损耗的非线性行为。根据损耗的统计理论 ,仔细地计算了每周过剩损耗。结果表明 ,这一理论能很好地描述低频损耗的非线性行为。     

高导磁Fe_(73.5)Cu_1Nb_2V_1Si_(13.5)B_9合金的中、高频损耗行为

在 f=0 .3～ 10 3kHz和Bm =0 .0 5～ 1.0T的范围内 ,考查了具有高起始磁导率的纳米晶合金的每周损耗频率关系。结果表明 ,在 f =0 .3～ 30kHz和Bm ≤ 0 .8T的范围内 ,惯用的损耗分离原则是适用的 ,可用Bertotti的统计理论描述P/f—f行为 ;对于Bm =1T ,这种描述在直到150kHz的范围内都适用。大约在 30kHz的高频区和 Bm ≤ 0 .8T的范围内 ,不能采用惯用的损耗分离法 ,P/f—f行为可用线性方程P/f =Peh Keclf来描述。这种描述对于Bm =1T的行为也很好地适用     

FeSiB/FeCuNbSiB合金在NaOH溶液中耐腐蚀性能及其对软磁性能的影响（英文）

非晶Fe78Si9B13和纳米晶Fe73.5Cu1Nb3Si13.5B9合金由于具有低矫顽力、高磁导率和高饱和磁通密度等特点而受到广泛关注。研究了Fe78Si9B13及Fe73.5Cu1Nb3Si13.5B9合金在NaOH(pH=9~10)溶液中的耐腐蚀性能,及其对软磁性能的影响。分析了经腐蚀后合金的有效磁导率、矫顽力和饱和磁感应强度等软磁性能的改变。样品用X射线衍射和3D高景深显微镜进行表征。结果显示:腐蚀后溶液中有橙色铁的氧化物产生,合金结构保持不变。经腐蚀后Fe78Si9B13及Fe73.5Cu1Nb3Si13.5B9合金的软磁性能下降,且Fe78Si9B13非晶合金的有效磁导率ue和饱和磁感应强度Bs比Fe73.5Cu1Nb3Si13.5B9纳米晶合金下降快。     

Corrosion Resistance of FeSiB and FeCuNbSiB Alloys and Its Influence on Their Soft Magnetic Properties in NaOH Solution

非晶Fe78Si9B13和纳米晶Fe73.5Cu1Nb3Si13.5B9合金由于具有低矫顽力、高磁导率和高饱和磁通密度等特点而受到广泛关注。研究了Fe78Si9B13及Fe73.5Cu1Nb3Si13.5B9合金在NaOH(pH=9~10)溶液中的耐腐蚀性能,及其对软磁性能的影响。分析了经腐蚀后合金的有效磁导率、矫顽力和饱和磁感应强度等软磁性能的改变。样品用X射线衍射和3D高景深显微镜进行表征。结果显示:腐蚀后溶液中有橙色铁的氧化物产生,合金结构保持不变。经腐蚀后Fe78Si9B13及Fe73.5Cu1Nb3Si13.5B9合金的软磁性能下降,且Fe78Si9B13非晶合金的有效磁导率ue和饱和磁感应强度Bs比Fe73.5Cu1Nb3Si13.5B9纳米晶合金下降快。     

低B_r纳米晶Fe_(73.5)Cu_1Nb_2V_1Si_(13.5)B_9合金的低频损耗行为

在 f=10～ 10 0 0Hz和Bm=0 4～ 1 0T范围内 ,测量了低Br 纳米晶Fe73 5Cu1Nb2 V1Si13 5B9合金的总功率损耗。将总损耗分离为三部分后 ,仔细地考查了每周过剩损耗的非线性行为。结果表明 ,损耗统计理论能很好地描述这一非线性行为。与对高起始磁导率态所得的结果比较表明 ,导致低Br 态的横向场退火使过剩损耗明显降低 ,从而明显地降低了总损耗。     

低Br纳米晶Fe73.5Cu1Nb2V1Si13.5B9合金的低频损耗行为

在f=10～1000Hz和Bm=0.4～1.0T范围内，测量了低Br纳米晶Fe7.35Cu1Nb2V1Si13.5B9合金的总功率损耗，将总损耗分离为三部分后，仔细地老查了每周过剩损耗的非线性行为。结果表明，损耗统计理论能很好地描述这一非线性行为。与对高起始磁导率态所得的结果比较表明，导致低Br态的横向场退火使过剩损耗明显降低，从而明显地降低了总损耗。     

纳米晶Fe72.8Cu1Nb1.7V1.5Mn0.5Si13.5B9软磁合金的磁性能

本文报道了高导磁纳米晶Fe72．8Cu1Nb1．7V1．5Mn0．5Si13．5B9合金的直流和交流磁性能水平，磁导率频散行为以及高频铁损行为，给出了描述高频区频散行为和铁损行为的近似表达式。     

新型Nanoperm合金的软磁性能研究

观察了新开发的Nanoperm型纳米晶合金（Fe90Zr3.5Nb3.5B3）95Cu1Si4在500℃-600℃退火态的磁导率，饱和磁通密度和矫顽力行为，并初步分析了软磁性能变化的机理和原因。     

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.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

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).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

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.     

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.     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.