稀土铝合金制备方法的应用研究

本文叙述了稀土铝合金的制备方法,并运用这些方法分别制备出稀土铝合金。此外,对单一稀土化合物的铝热法还原制备稀土铝二元合金工艺进行了探索,成功地制备出La、Ce、Nd、Eu、Gd、Dy、Y 等铝的二元合金,获得了较高的稀土实收率。     

熔盐电解制备稀土铝合金的研究

铝中加入一定量的稀土金属后,铝合金的导电性、机械强度、耐腐蚀性和耐热性等方面都有明显的提高。稀土金属在铝合金中具有净化、细化和合金化效果。稀土铝合金因有上述的特点,而广泛地应用在电工铝的生产上。研究稀土铝合金的制取方法对稀土铝合金的广泛应用具有积极的推动作用。本实验使用熔盐电解法制备了稀土铝合金。     

稀土在废铝再生铸造铝合金中的应用

本文简述了稀土应用与废铝再生两者结合的重要意义和废杂铝再生铸造铝合金添加稀土新工艺的特点、技术关键操作要点及试验研究结论：分析探讨了稀土铸造铝合金的组成、结构和性能关系以及稀土加入的作用机理；扼要评述了瓣工艺的技术经济效果和推广应用前景。     

稀土泡沫铝合金的制备

以熔融ZAlSi7MgA铝合金(ZL101A)基体金属与稀土熔炼后制得稀土铝合金,加入合金增粘剂和发泡剂,制得稀土泡沫铝合金。实验在常压下制得的稀土泡沫铝合金气孔率12 8%～33 5%。     

稀土在铝及铝合金中的应用

本文综述了我国稀土铝合金的研究和应用现状，着重讨论了稀土在铝合金中的作用，并展望了稀土铝合金的发展前景。     

我国独具特色的稀土电工铝和铝稀土合金

中国稀土铝导体和铝稀土合金研究，开发和应用过程概况，稀土导电铝和稀土铝合金的特性；铝稀土合金应用领域逐步扩大，稀土消费量迅速增加；制取铝稀土合金系列的新思想和新工艺过程；稀土添加剂在铝和铝合金中的作用；某些值得注意的问题。     

稀土元素在铝合金转化膜中的应用

铝合金稀土转化膜具有优异的耐蚀性能和无毒无污染等优点,是最具希望代替铬酸盐有毒处理、有良好发展前景的转化膜之一.本文从成膜工艺、膜的组成、结构及形貌、成膜机理和耐蚀机理四个方面介绍了铝合金稀土转化膜技术在国内外的研究进展及现状,展示了稀土元素在铝合金转化膜中广阔的应用前景,并对这一技术未来的发展方向提出了展望.     

改善A356.2铝合金质量的措施

进行了提高A356.2铝合金质量的试验研究,结果表明：氮气不仅具有除气和除渣的作用,而且能够提高合金的强度,经过稀土变质处理后,共晶硅的形貌得到改善.     

稀土对6063铝合金导电、导热性能的影响

在实验基础上研究了稀土对6063铝合金导电、导热性能的影响及作用机理。实验研究表明，稀土可改善6063铝合金导电、导热性能，同时，还对镁，硅含量及热处理工艺对6063铝合金性能的影响做了分析和研究。     

AgLa1.0银合金组织与性能的研究

用纯主 99 99%的银和 99 5 %的镧在真空条件下熔化和精炼制备含 1 0 %镧的银合金 ,铸锭经过热轧开坯、冷拉拔及再结晶退火等工序 ,制备各种试样 观察铸态与退火态金相组织和电子探针扫描图像 ,进行合金性能试验和自然时效软化试验 结果发现 ,稀土镧可以显著细化银合金铸态组织和再结晶退火组织 ,稀土化合物成块状弥散分布在基体中 ,显著地提高了AgLa1 0合金的再结晶温度和热稳定性 ,稀土镧可以有效地抑制冷变形银的自然时效软化作用     

Study of corrosion protection of the composite films on A356 aluminum alloy

Composite films were fabricated on A356 aluminum alloy by combined anodizing and rare earth deposition.The corrosion protection effect and corrosion behavior of the composite films in 3.5% NaCl solution were studied by electrochemical impedance spectroscopy(EIS).SEM observation indicated that the rare earth Ce film completely sealed the porous structure of the anodic film,and the compositefilms composed of anodic film and Ce film were compact and integrated.According to the characteristics of EIS,the EIS plots of the composite films at different immersion times were simulated using the equivalent circuits of Rsol(QceRce)(QaRa),Rsol(QceRce)(QpRp)(QbRb) andRsol(QpRp)(QbRb) models,respectively.The test results showed that the Ce film at the outer layer of the composite films had good protectioneffect at the initial stage of the immersion corrosion.It effectively helped the anodic film at the inner layer to prevent chloride irons frompenetrating the aluminum alloy matrix.After 18 days,the Ce film lost its anticorrosive property,and the anodic film took the leading role ofthe corrosion protection.When the corrosion time was up to 42 days,the aluminum matrix was not corroded yet.Thus,the higher protectiondegree of the composite films for A356 aluminum alloy was attributed to the synergism effects of anodic film and rare earth Ce film.     

稀土在铝及其合金中的作用和应用

稀土元素作为微量元素加入铝及其合金中,不仅有细化晶粒的变质作用,还有净化熔体、减少气体含量及氧化夹杂的精炼效果,从而可显著改善和提高铝及其合金的综合性能。讨论了稀土在铝及其合金中的作用机理。论述了稀土在铝及其合金中的应用现状及发展前景。     

Effect of homogenization on microstructure and properties of WE91 alloys

The microstructure and properties of the Mg-9Y-1MM-0.6Zr alloy were studied by scanning electron microscopy, optical microscopy, transmission electron microscopy, hardness and tensile testing. Homogeni...     

Electrochemical performance of Gd-Co-Mn alloys

The Gd-Co-Mn alloys with compositions of Gd33.3Co66.7,Gd33.3Mn66.7,Gd22.2Co74.8Mn3 and Gd25Co70Mn5 were prepared and examined by X-ray diffractometer.The electrochemical properties of these alloys such as discharge capacity,cycling performance and high rate dischargeability were investigated by battery testing instruments in alkaline electrolyte.The discharge capacity of Gd22.2Co74.8Mn3 was the highest among these alloys at the same discharge current density,and the maximum value was 376.7 mAh/g discharged at 150 mA/g.The discharge capacities of the alloys Gd33.3Co66.7 and Gd33.3Mn66.7 reached their maxima(about 225 and 325 mAh/g)at discharge current density of 150 mA/g.A comparison of the electrochemical performance of the Gd-Co-Mn alloys revealed that the alloy Gd22.2Co74.8Mn3 possessed better electrochemical performance and had better discharge capacity,cycle stability,while the alloy Gd25Co70Mn5 had a better high rate discharge ability.In general,the electrochemical performance of ternary alloys was better than binary alloys in this case.     

钇对Al-Cu-Mg-Mn合金组织与性能的影响

采用金相显微镜、X射线衍射仪及扫描电镜等研究手段,研究了质量分数为0%～0.4%的Y在Al-Cu-Mg-Mn合金中存在形式及对其组织性能的影响,研究结果表明：Y含量在低于0.3%范围时,随含量增加合金细化效果逐渐增加;当Y含量为0.3%时,铸态组织中晶粒细化与组织均匀化效果明显;当Y含量大于0.3%时,合金的铸态组织中晶粒随着其含量的增加又逐渐粗化;Y加入合金中主要形成Cu4Al8Y,合金组织性能得到改善.     

稀土元素对热镀铝锌镀层的影响研究

针对铝锌热镀板存在的问题,通过试验研究了添加稀土元素对热镀铝锌合金镀层的影响,结果表明:添加稀土后提高了铝锌镀板的总体性能,为该类镀板质量的改进和应用领域的延伸提供了途径。