AZ31镁合金表面超疏水涂层的制备及耐蚀性（英文）

为提高镁合金的耐蚀性,通过微弧氧化和硬脂酸乙醇溶液疏水处理两步法在镁合金表面制备超疏水涂层。考察微弧氧化电压、频率和时间对疏水处理试样接触角的影响。结果表明:随着微弧氧化电压、频率和时间的增加,疏水处理试样的接触角均先增大后减小,分别在350 V、1000 Hz和5 min时获得最大值。最佳超疏水涂层主要由MgO和Mg2Si O4相组成,其表面微孔直径为～900nm,厚度为～6.86μm,接触角高达156.96°。超疏水试样的腐蚀电流密度较基体降低3个数量级,而氢气析出量较基体降低94.77%。     

Ti-6Al-4V合金表面微弧氧化涂层的制取及其耐磨性能

研究了Ti-6Al-4V合金的阳极氧化处理工艺．在合金表面获得了耐磨性能优异的微弧氧化(MAO)涂层。     

热处理对β钛合金微弧氧化膜特性的影响

通过对Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe合金进行热处理,研究热处理工艺对该合金的相组成和电阻率的影响以及对氧化膜的厚度、粗糙度、微观形貌及相组成的影响。结果表明,通过热处理改变Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe合金的相组成,热处理后试样的电阻率小幅降低;经850℃固溶热处理后所获微弧氧化膜的厚度和粗糙度最小,分别为48.3和7.45μm;微弧氧化膜微观形貌显示,经750和850℃固溶热处理后的试样,在微弧氧化后,其膜层表面裂纹较少,并且致密;微弧氧化膜主要的组成相为金红石相TiO_2和锐钛矿相TiO_2。     

TC4钛合金体育器械的表面改性工艺研究

以微弧氧化电压和氧化时间为变化参量,考察了不同工艺参数下TC4合金表面涂层的厚度、表面粗糙度、孔隙率和平均孔径的变化规律,得到了TC4钛合金适宜的微弧氧化工艺,并探讨了表面涂层的沉积长大机理。结果表明,TC4钛合金涂层厚度在电压为450 V时达到最大值36.2μm,而表面粗糙度在电压为500 V时取得最大值3.3μm。涂层表面的孔隙率和平均孔径随着电压的增加而呈现逐渐增加的趋势。随着微弧氧化时间的增加,钛合金表面涂层厚度和表面粗糙度都呈现出逐渐增加的趋势。在微弧氧化前30 min内,钛合金涂层的表面孔隙率的增长速度较快,而当氧化时间超过30 min后,涂层表面孔隙率增长速度变缓,而平均孔径仍然以较快的速度增加。     

用热扩散方法在Ti-6Al-4V合金表面获得铝化物和硅化物涂层

采用固体粉末包装热扩散方法,对Ti-6Al-4V合金分别进行表面渗铝和渗硅处理,以提高该合金的抗高温氧化性能。结果表明:Ti-6Al-4V合金表面形成的铝化物涂层的金相组织为单层结构,其上有少量贯穿裂纹存在;主要相结构是TiAl_3。而硅化物涂层的金相组织则为双层结构,外层较厚,呈柱状晶,由TiSi_2相组成;内层则较薄,由Ti_5Si_4相组成。表面渗铝和渗硅处理都可以大大提高Ti-6Al-4V合金的抗高温氧化性能。     

钛合金与WC-17Co涂层界面结合性能分析

采用超音速火焰喷涂技术在Ti-6Al-4V合金表面制备WC-17Co涂层,从显微形貌、界面氧化行为、裂纹扩展形式等方面系统分析了WC-17Co涂层与Ti-6Al-4V基体界面断裂失效原因,并利用四点弯曲法测量了WC-17Co与Ti-6Al-4V合金的平均断裂能量释放率.结果表明,热喷涂过程使Ti-6Al-4V的表面氧化相含量显著提高.氧化后Ti-6Al-4V的表面显微硬度达到322.4 HV,熔融粒子撞击到Ti-6Al-4V表面很难对基体造成明显的塑性变形,不能形成有效咬合,使得钛合金与WC-17Co涂层的结合性能偏低.     

微弧氧化工艺参数对Ti-6Al-4V钛合金表面氧化膜厚度及表面形态的影响

为了提高Ti-6Al-4V钛合金表面的生物活性,在乙酸钙和磷酸二氢钠溶液中对Ti-6Al-4V钛合金进行微弧氧化,研究氧化时间,电压,占空比等对氧化膜厚度及其表面形态的影响。结果表明,在一定条件下,随氧化时间的增加,氧化膜厚度以指数关系增加,而膜层表面孔洞逐渐变小,最终封闭;随着电压的提高,膜层厚度增加平缓,但电压过大时,膜层反而变薄,氧化膜表面微孔的数量减少,但微孔的孔径逐渐增大;占空比的提高使得膜层厚度增加,同时伴随有膜层孔洞分布的均匀性变差,表面粗糙度增加。     

微弧氧化工艺对Ti-6Al-4V钛合金表面氧化膜厚度及表面形态的影响

为了提高Ti-6Al-4V钛合金表面的生物活性,在乙酸钙和磷酸二氢钠溶液中对Ti-6Al-4V钛合金进行微弧氧化,研究氧化时间、电压、占空比等对氧化膜厚度及其表面形态的影响。结果表明,在一定条件下,随氧化时间的增加,氧化膜厚度以指数关系增加,而膜层表面孔洞逐渐变小,最终封闭;随着电压的提高,膜层厚度增加平缓,但电压过大时,膜层反而变薄,氧化膜表面微孔的数量减少,但微孔的孔径逐渐增大;占空比的提高使得膜层厚度增加,同时伴随有膜层孔洞分布的均匀性变差,表面粗糙度增加。     

双电极微弧氧化陶瓷膜层的制备

在铝酸盐体系中,在Ti-6Al-4V合金表面利用微弧氧化双脉冲电源在2个电极上同时制备了含Al2TiO5相的陶瓷膜层。通过XRD,SEM和EDS等技术,分析了相组成、表面形貌和元素含量的变化。讨论了2个电极试样面积比对微弧氧化陶瓷膜组成、形貌和元素含量的影响。结果表明:2个反应电极试样面积比越接近,膜层中Al2TiO5含量就越高;当面积比为1:1时,膜层几乎都是Al2TiO5相;随2个电极面积比的增大,膜层Al元素含量呈先增大后减小,Ti和V元素含量是先减小后增大,而P元素含量则一直在增加。     

TiO2/Al2O3微弧氧化复合涂层的制备及耐磨性研究

本文主要利用微弧氧化方法在Ti-6Al-4V合金表面制备TiO2/Al2O3复合涂层,并揭示了O2-、AlO2-,和Ti4 在涂层生长过程中的作用机制。在高温高电压条件下,Ti-6Al-4V合金表面首先生成TiO2、Al2O3和Al2TiO5,不断放电引起的高热能导致Al2TiO5进一步分解成TiO2和Al2O3,且XRD分析表明涂层的物相组成主要是A-TiO2、R-TiO2和α-Al2O3。耐磨性测试结果表明,与基体相比TiO2/Al2O3复合涂层的显微硬度提高到1100HV,且耐磨性显著提高,磨损量降低了9.5倍。     

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.     

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.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

正~~     

Antimony Induced Crystallization of Amorphous Silicon

Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony.     

A CUMULATIVE FATIGUE DAMAGE RULE UNDER THE ALTERNATIVE OF CORROSION OR CYCLIC LOADING

Fatigue damage increases with the applied loading cycles in a cumulative manner and the material deteriorates with the corrosion time. A cumulative fatigue damage rule under the alternative of corrosion or cyclic loading was proposed. The specimens of aluminum alloy LY12-CZ soaked in corrosive liquid for different times were tested under the constant amplitude cyclic loading to obtain S-N curves. The test was carried out to verify the proposed cumulative fatigue damage rule under the different combinations among corrosion time, loading level, and the cycle numbers. It was shown that the predicted residual fatigue lives showed a good agreement with the experimental results and the proposed rule was simple and can be easily adopted.