LATERAL STABILITY OF ALTERNATIVE HORIZONTAL LEVITATION ELECTROMAGNETIC CONTINUOUS CASTING OF ALUMINIUM SHEET

１ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｔｅｒｎａｔｉｖｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｉｓａｈｉｇｈｌｉｇｈｔｅｄｎｅｗｔｅｃｈｎｉｑｕｅ．Ｉｎｔｈｉｓｔｅｃｈｎｉｑｕｅｔｈｅｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｃｅｐｒ...     

FORMING PROCESS OF HOT-EXTRUDED SiCw/6061Al COMPOSITES(Ⅰ)

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｙｅａｒｓ，ｍｏｒｅａｎｄｍｏｒｅｃｏｎｔｉｎｕｏｕｓｌｙｏｒｄｉｓｃｏｎｔｉｎｕｏｕｓｌｙｒｅｉｎｆｏｒｃｅｄｍｅｔａｌｍａｔｒｉｘｃｏｍｐｏｓｉｔｅｓ（ＭＭＣｓ）ｈａｖｅｂｅｅｎｕｓｅｄｔｏｍａｋｅｓｔ...     

A STUDY OF CONTINUOUS EXTRUSION CLADDING PROCESSFOR PRODUCTION OF ALUMINUM CLADDING STEEL WIRE

１．ＩｎｔｒｏｄｕｃｔｉｏｎＤｅｖｅｌｏｐｍｅｎｔａｃｔｉｖｉｔｙｏｆｃｏｎｔｉｎｕｏｕｓｅｘｔｒｕｓｉｏｎｐｒｏｃｅｓｓｌｅａｄｓｔｏｔｈｅｉｎｔｒｏｄｕｃｔｉｏｎｏｆｃｏｎｔｉｎｕｏｕｓｅｘｔｒｕｓｉｏｎｃｌａｄｄｉｎｇｐｒｏｃｅｓｓｆｏｒｔｈｅｃｌａｄｄｉｎｇｏｆｓｔｅｅｌｗｉｒｅ（ＡＳｗｉｒｅ）ａｎｄｔｈｅｓｈｅａｔｈｉｎｇｏｆｓｏｆｔｃｏｒｅｓ（ｆｉｂｅｒｏｐｔｉｃｓａｎｄＣＡＴＶ）ｗｉｔｈａｌｕｍｉｎｕｍ．Ｔｈｅｃｏｎｔｉｎｕｏｕｓｅｘｔｒｕｓｉｏｎｃｌａｄｄｉｎｇｐｒｏｃｅｓ…     

Hot top electromagnetic casting research of Al thin slab

１　ＩＮＴＲＯＤＵＣＴＩＯＮＥｌｅｃｔｒｏｍａｇｎｅｔｉｃｃａｓｔｉｎｇ（ＥＭＣ）ｉｓａｍｏｕｌｄｌｅｓｓｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｔｅｃｈｎｏｌｏｇｙｗｉｔｈｗｈｉｃｈｌｉｑｕｉｄｍｅｔａｌｉｓｓｈａｐｅｄｂｙｅｌｅｃｔｒｏｍａｇｎｅｔｉｃｆｏｒｃｅａｎｄｉｔｈａｓａｄｖａｎｔａｇｅｓｓｕｃｈａｓ：ｓｍｏｏｔｈｉｎｇｏｔｓｕｒｆａｃｅ，ｃｏｍｐａｃｔ，ｈｏｍｏｇｅｎｅｏｕｓｔｉｓｓｕｅａｎｄｈｉｇｈｅｒｃａｓｔｉｎｇｖｅｌｏｃｉｔｙ．ＥＭＣｔｅｃｈｎｏｌｏｇｙｈａｓｂｅｅｎｄｅｖ…     

DRAWING OF ALUMINUM CLAD STEEL WIRE BY FORCE FEED LUBRICATION

１．ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅｃｏｎｔｉｎｕｏｕｓｅｘｔｒｕｓｉｏｎｐｒｏｃｅｓｓｒｅｓｕｌｔｓｉｎｔｈｅｃｈａｎｇｅｏｆｔｈｅｔｅｃｈｎｉｑｕｅｉｎｐｒｏｄｕｃｔｉｏｎｏｆａｌｕｍｉｎｕｍｃｌａｄｓｔｅｅｌｗｉｒｅ〔１〕．Ｂｙｔｈｅｍｅａｎｓｏｆｔｈｅｃｏｎｔｉｎｕｏｕｓｅｘｔｒｕｓｉｏｎｐｒｏｃｅｓｓ,ａｌｕｍｉｎｕｍｃｌａｄｓｓｔｅｅｌｃｏｒｅ,ａｎｄｔｈｅｎｔｈｅｓｔｅｅｌｃｏｒｅｃｌａｄｗｉｔｈａｌｕｍｉｎｕｍｉｓｄｒａｗｎｉｎｔｏａｆｉｎｉｓｈ…     

Numerical simulation of temperature field of copper and copper alloy in horizontal continuous casting

１ＩｎｔｒｏｄｕｃｔｉｏｎＢｅｃａｕｓｅｏｆｔｈｅｈｉｇｈｅｆｆｉｃｉｅｎｃｙａｎｄｅｎｅｒｇｙｓａｖｉｎｇｓ，ｔｈｅｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｔｅｃｈｎｏｌｏｇｙｉｓｗｉｄｅｌｙａｐｐｌｉｅｄ．Ｃｏｎｔｉｎｕｏｕｓｃａｓｔｉｎｇｉｓｄｉｆｆｅｒｅｎｔｆｒｏｍｏｒｄｉｎａｒｙｃａｓｔｉｎｇｉｎｗｈｉｃｈｔｈｅｍｅｔａｌｌｉｑｕｉｄｉｓｎｏｔｃａｓｔｉｎｔｏａｓｉｎｇｌｅｍｏｌｄ，ｂｕｔｓｔｅａｄｉｌｙｉｎｔｏａｍｏｌｄｃｏｏｌｅｄｂｙｗａｔｅｒ，ａｎｄｔｈｅｓｏｌｉｄｉｆｉｅｄｍｅ…     

STUDY ON C FIBER REINFORCED CELSIAN MATRIX COMPOSITES

１．ＩｎｔｒｏｄｕｃｔｉｏｎＶａｒｉｏｕｓｇｌａｓｓｃｅｒａｍｉｃｍａｔｒｉｘｒｅｉｎｆｏｒｃｅｄｗｉｔｈｃｏｎｔｉｎｕｏｕｓｃｅｒａｍｉｃｆｉｂｅｒｓｈａｖｅｂｅｅｎｄｅｖｅｌｏｐｅｄａｓｃａｎｄｉｄａｔｅｍａｔｅｒｉａｌｓｆｏｒｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｕｃｔｕｒａｌａｐｐｌｉｃａｔｉｏｎｓｉｎａｅｒｏｓｐａｃｅｕｔｉｌｉｔｉｅｓａｎｄｔｒａｎｓｐｏｒｔａｔｉｏｎｉｎｄｕｓｔｒｉｅｓｏｖｅｒｔｈｅｌａｓｔｔｗｏｄｅｃａｄｅｓ〔１,２〕．Ｂａｒｉｕｍａｌｕｍｉｎｏｓｉｌｉｃａｔ…     

THE STRUCTURE AND PERFORMANCES OF THE LARGE DIMEMENSION STEEL BALL MADEOF 45 STEEL QUENCHED AFTER FORGING

１．Ｉｎｔｒｏｄｕｃｔｉｏｎ４５ｓｔｅｅｌｉｓｕｓｅｄｗｉｄｅｌｙｉｎＣｈｉｎａ．Ｔｈｅｐｒｏｃｅｓｓｉｓａｓｕｓｕａｌｔｈｅｆｏｌｌｏｗ：ｆｏｒｇｉｎｇｍａｃｈｉｎｉｎｇｒｏｕｇｈｌｙｑｕｅｎｃｈｉｎｇｔｅｍｐｅｒｉｎｇａｔｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｍａｃｈｉｎｉｎｇｆｉｎｅｌｙ．Ｃｏｎｓｕｍｉｎｇｅｎｅｒｇｙａｎｄｂａｄｓｕｒｆａｃｅｃｏｎｄｉｔｉｏｎａｒｅｔｈｅｍａｊｏｒｄｅｆｅｃｔｓｏｆｔｈｉｓｐｒｏｃｅｓｓ．Ｓｏｍｅｔｉｍｅｓｔｈｅｆｉｎｅ,ｈｏｍｏｇｅｎｅｏｕｓａｕｓｔ…     

VALENCE ELECTRON STRUCTURE OF HIGH PROPERTY HIGH SPEED RESISTANCE STEEL AND ITS COMPOSITION DESIGN

１．ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｍａｉｎｐｒｏｐｅｒｔｙｒｅｑｕｉｒｅｍｅｎｔｔｏｈｉｇｈｓｐｅｅｄｉｍｐａｃｔｒｅｓｉｓｔａｎｃｅ（ＨＳＩＲ）ｓｔｅｅｌｉｓｂｏｔｈｈｉｇｈｓｔｒｅｎｇｔｈａｎｄｒｅｌａｔｉｖｅｈｉｇｈｔｏｕｇｈｎｅｓｓ．Ｔｈｅａｃｔｕａｌｒｅｑｕｉｒｅｍｅｎｔｓａｄｖａｎｃｅｄａｃｃｏｒｄｉｎｇｔｏａｐｐｌｉｃａｔｉｏｎｃｏｎｄｉｔｉｏｎｓａｒｅ：σｂ１６００ＭＰａ,σｓ１３００ＭＰａ,δ５８％,ＡＫＶ（ａｔ４０℃,ｃｒｏｓｓｄｉｒｅｃｔｉｏｎ）１４Ｊ．Ｉｎ…     

Continuous recrystallization in pure Al 1.3% Mn investigated by local orientation analysis

１　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃｌａｓｓｉｃａｌｗｏｒｋｓｏｎｃｏｎｔｉｎｕｏｕｓｒｅｃｒｙｓｔａｌｌｉｚａｔｉｏｎ（ｏｒｒｅｃｒｙｓｔａｌｌｉｚａｔｉｏｎｉｎｓｉｔｕｏｒｅｘｔｅｎｄｅｄｒｅｃｏｖｅｒｙ）ａｒｅｔｈｏｓｅｏｆＨｏｒｎｂｏｇｅｎａｎｄＫ¨ｏｓｔｅｒ［１～３］ｏｎＡｌＦｅａｎｄＡｌＣｕ．ＩｔｉｓｔａｋｅｎｆｏｒｇｒａｎｔｅｄｔｈａｔｔｈｅＺｅｎｅｒｐｉｎｎｉｎｇｄｕｅｔｏｓｅｃｏｎｄａｒｙｐｒｅｃｉｐｉｔａｔｉｏｎｉｓｔｈｅｍａｉｎｒｅａｓｏｎｆｏｒｔｈｅｏｃｃｕｒｒｅ…     

Al2O3/Cu复合材料强化机理研究

采用内氧化法制备了Al2O3／Cu复合材料，进行了高温电子拉伸实验，并通过微观组织观察，分析了该复合材料的强化机理。拉伸实验结果显示：Al2O3／Cu复合材料不仅室温强度很高，而且高温时仍保持较高的强度。微观组织观察分析表明：细小的Al2O3颗粒的弥散分布是该复合材料具有高强度的主要原因，表现在：Al2O3颗粒存在能够抑制Cu基再结晶的进行；Al2O3颗粒的存在阻碍晶界亚晶界运动，从而阻碍晶粒长大；Al2O3颗粒的阻碍位错运动，增加位错密度；Al2O3颗粒的存在提高材料的蠕变抗力。     

Al-Si/Al_2O_3 in situ composite prepared by displacement reaction of CuO/Al system

Al2O3 particle-reinforced ZL109 composite was prepared by in situ reaction between CuO and Al.The microstructure was observed by means of OM,SEM and TEM.The Al2O3 particles in sub-micron sizes distribute uniformly in the matrix,and the Cu displaced from the in situ reaction forms net-like alloy phases with other alloy elements.The hardness and the tensile strength of the composites at room temperature have a slight increase as compared to that of the matrix.However,the tensile strength at 350 ℃ has reached 90.23 MPa,or 16.92 MPa higher than that of the matrix.The mechanism of the reaction in the CuO/Al system was studied by using of differential scanning calorimetry(DSC) and thermodynamic calculation.The reaction between CuO and Al involves two steps.First,CuO reacts with Al to form Cu2O and Al2O3 at the melting temperature of the matrix alloy,and second,Cu2O reacts with Al to form Cu and Al2O3 at a higher temperature.At ZL109 casting temperature of 750-780 ℃,the second step can also take place because of the effect of exothermic reaction of the first step.     

稀土La对Al2O3/Cu复合材料组织与性能的影响

利用机械合金化法结合放电等离子烧结制备Al2O3/Cu铜基复合材料,采用XRD、SEM、硬度、抗拉强度和电导率等测试研究La含量对Al2O3/Cu复合粉末和烧结材料组织及性能的影响。结果表明:添加0.05%的稀土La有利于机械合金化过程中Cu晶粒的细化和Al2O3颗粒的弥散分布,从而提高烧结材料的显微硬度和抗拉强度。烧结材料的导电率随着La含量的增加先升后降,当La的质量分数为0.10%时,Al2O3/Cu复合材料的导电率提高11.3%IACS。     

颗粒增强铝合金叠层复合材料的制备与强度和耐磨性

介绍了ＳｉＣ颗粒增强ＡｌＣｕ合金叠层复合材料的制备方法，研究了叠层复合材料的抗弯强度和增强层的耐磨性与ＳｉＣ颗粒含量的关系。结果表明，ＳｉＣ颗粒体积分数为２０％时该材料的抗弯强度最大，磨损量最小；ＳｉＣ颗粒与基体结合强度及层间宏观应力影响材料的强度性能     

Abrasive wear characteristics and mechanisms of Al2O3／PA1010 composite coatings

The abrasive wear characteristics of Al2O3/PA1010 composite coatings on the surface of quenched and low-temperature temper steel 45 were tested on the tumplate abrasive wear testing machine and the same uncoated steel 45 was used as a reference material. Experimental results showed that the abrasive wear resistance of Al2O3/PA 1010 composite coatings has a good linear relationship with the volume fraction of Al2O3 particles in Al2O3/PA1010 composite coatings, and the linear correlative coefficient is 0.979. Under the experimental conditions, the size of Al2O3 particles (40.5-161.0μm) has little influence on the abrasive wear resistance of Al2O3/PA1010 composite coatings. By treating the surface of Al2O3 parti-cles with a suitable bonding agent, the distribution of Al2O3 particles in matrix PA1010 is more homogeneous and the bonding state between Al2O3 particles and matrix PA1010 is better. Therefore, the Al2O3 particles in Al2O3/PA1010 compos-ite coatings make the Al2O3/PA1010 composite coatings have better abrasive wear resistance than PA1010 coatings. The wear resistance of Al2O3/PA1010 composite coatings is about 45% compared with that of steel 45.     

机械合金化结合内氧化法制备Al2O3/Cu复合材料

Al2O3/Cu复合材料具有高的强度和高的导电性及优良的抗电弧性能,广泛应用于电子封装材料、电极和电触头材料。采用机械合金化制备亚稳态的Cu-Al-Cu2O合金粉末,经压制成型后,采用新型内氧化工艺进行烧结处理,得到高强度高导电的Cu/Al2O3复合材料。结果表明:机械球磨96h,Al原子已完全固溶于Cu的晶格中。经1183K内氧化处理4h试样组织均匀致密,Al2O3颗粒弥散分布在铜基体上,其硬度高,电导率高。     

添加NH_4AlO（OH）HCO_3原位生成Al_2O_3/Al复合材料的制备及其性能

碳酸铝铵与熔融的铝液反应原位生成颗粒增强铝基复合材料,对复合材料的力学性能和摩擦磨损行为进行研究。结果表明：在搅拌的铝熔体中碳酸铝铵发生分解反应生成γ-Al2O3;该原位反应的增强颗粒比直接添加的Al2O3在铝熔体中分布得更均匀;复合材料的密度和硬度随着增强相加入量的增加而提高,而强度则随着增强相加入量的增加而降低;磨损率随着增强相加入量的增加和载荷的增加而提高;原位反应生成的复合材料的力学性能和耐磨性明显优于直接添加Al2O3颗粒形成的复合材料的。     

Microstructures and properties of graphite and Al2O3 short fibers reinforced Mg-Al-Zn alloy hybrid composites

Graphite and Al2O3 short fibers reinforced Mg-Al-Zn alloy hybrid composites were fabricated by perform squeeze-infiltration route. The effects of the volume of graphite particles on the microstructure, mechanical properties and tr/bological behavior were investigated under the conditions of constant size of graphite particle and volume of Al2O3 short fiber. The results reveal that the uniform distribution of the reinforced graphite particles and Al2O3 short fiber can be obtained by this technique, and they have strong bonding with the metal matrix. Increasing graphite volume results in decrease in hardness, the ultimate tensile strength whereas the Al2O3 short fiber makes contribution to the increase in hardness of the composite. The composite exhibits good wear resistance, small wear mass loss and low coefficient of friction as compared with the metal matrix. The wear mechanisms transit from oxidation wear, abrasion wear into delamination wear as the applied load is increased, and a film of lubricant covering almost entire surface of specimen, is found to be formed, which separates the wear surfaces from metal to metal contact and thus improves the tribological properties.     

Ti_2AlN-La_2O_3/Cu复合材料的界面反应与性能

采用粉末冶金法制备了以Ti2AlN和La2O3为增强相的新型铜基复合材料。研究了Ti2AlN与Cu界面反应及其对复合材料性能的影响。结果表明:Ti2AlN颗粒化学镀铜后改善了铜与Ti2AlN的界面结合情况,形成了宽度为20 nm左右的过渡区。在880~940℃的烧结温度范围内,增强相与基体的界面发生化学反应,生成了Cu(Al)固溶体与TiNx,在显著提高复合材料强度的同时,降低材料的导电性。另外,La2O3纳米颗粒分布在铜基体内,对材料起到弥散强化的作用。     

Properties of Fe-based Amorphous Alloy Coatings with Al2O3-13% TiO2 Deposited by Plasma Spraying

采用大气等离子喷涂技术成功在Fe普碳钢基材上制备了含有不同质量分数Al2O3-13%Ti O2颗粒的Fe基非晶复合涂层,其中Fe基非晶相成分为Fe71Cr5B4Si4Ni3Mo3W10(wt%),并对涂层的微观结构、显微硬度和耐蚀性能进行了研究。在Fe基非晶相与Al2O3-13%Ti O2陶瓷相界面观察到Fe、Ti、W、Al和O元素的互扩散现象,这种微区冶金结合减少了由于第二相的加入导致的涂层孔隙并增加了相间的结合强度。当加入的Al2O3-13%Ti O2质量分数≥16 wt%时,涂层的显微硬度升高≥20%;复合非晶涂层在10 wt%Na OH溶液中的耐腐蚀性能高于1Cr18Ni9Ti不锈钢。