稀土—铁系超磁致伸缩材料的应用研究

本文对稀土－铁系超磁致伸缩的基本特性及应用前景进行了回顾与总结，剖析了该材料应用器件原理及结构，系统地介绍了国外稀土铁系超磁致伸缩材料在各个领域的应用及开发情况。展示了作者研制的低频水声换能器。该换能器具有低频，宽频带及电流灵敏度高的特点。     

Fe-Ga合金及应用研究进展

Fe-Ga合金具有饱和磁场小、机械强度高、成本低等特点,这些特点优于稀土超磁致伸缩材料和传统磁致伸缩材料,具有潜在的应用价值,是磁致伸缩材料研究中的热点之一。从合金成分、制备方法、热处理、应用几部分阐述了Fe-Ga合金磁致伸缩材料的研究进展。     

巨磁致伸缩材料及应用研究进展

巨磁致伸缩材料是20世纪70年代发展起来的新型功能材料,具有应变大,能量转换效率高等优点,在功能转换、智能驱动、智能传感等高技术领域有重要应用。简要介绍了磁致伸缩及巨磁致伸缩材料的发展历史,从稀土巨磁致伸缩材料、非稀土巨磁致伸缩材料的合金化研究、制备技术和应用技术等方面综述了我国巨磁致伸缩材料的发展历程,介绍了我国的科研工作者在巨磁致伸缩材料研究领域所取得的重要研究成果,最后对巨磁致伸缩材料发展及应用进行了展望。     

超磁致伸缩材料的温度性能研究进展

本文综述了稀土-铁系超磁致伸缩材料温度性能的研究进展,指出了超磁致伸缩材料温度性能的可能影响因素,并讨论了提高超磁致伸缩材料温度性能的可能途径.     

稀土—铁大磁致伸缩材料

由于稀土—铁大磁致伸缩材料具有室温下大磁致应变，优良低场磁性能及较大的机电耦合系数，因而越来越受到人们的重视，并应用到许多高科技领域。本文通过对稀土—铁大磁致伸缩材料的回顾，及其室温下大磁致应变的产生机制的分析，具体讨论了该材料的制备工艺及其材料性能改善途径，并概述了稀土—铁大磁致伸缩材料的生产状况和应用。     

超磁致伸缩材料

超磁致伸缩材料自从美国海军战略研究所发现超磁致伸缩材料以来至今已有２０余年，并已商品化投入市场。当初采用布里奇曼法制造，而今几乎都已改用冶末冶金法生产，其制造工艺类似于稀土磁体的生产过程，控制Ｏ２含量（＜０．１５％）十分重要。超磁致伸缩材料是由磁矩和...     

稀土磁致伸缩材料的应用

稀土工业是第二次世界大战以后迅速发展并崛起的新兴产业。稀土产品作为一种特殊的功能材料,能够大幅度地提高其它产品的质量和性能,号称工业的“维生素”。本文着重介绍了稀土磁致伸缩材料的应用,包括稀土磁致伸缩材料的应用基础,研究现状和发展前景等。     

稀土超磁致伸缩材料在水下发射器中的应用

本文从稀土超磁致伸缩材料的独特性能入手,结合国内外一些新的换能器设计理念,针对宽频水声换能器的使用特点,给出了换能器的理论设计方法,同时还给出了其结构形式.测试结果和使用性能表明,达到了预期的目的,这也是该材料在国内首次应用于单只宽频水声换能器中,开创了稀土超磁致伸缩材料应用的又一个先例.     

RE-GMM致动器设计方法研究

分析了稀土超磁致伸缩材料TbDyFe合金的物理、机械性能，介绍了超磁致伸缩致动器的工作原理。根据TbDyFe合金的磁学性能要求，给出了励磁线圈及磁回路的设计方法。通过对样机测试结果的分析，归纳了RE-GMM致动器的一般设计方法，并验证了部分理论分析结果。     

“超磁致伸缩材料”及八五攻关“非晶”三项课题通过鉴定

“超磁致伸缩材料”及八五攻关“非晶”三项课题通过鉴定１９９４年１１月２５日冶金部军工办在北京钢铁研究总院主持召开了部级重点科技攻关项目“超磁致伸缩稀土合金换能材料及换能器”课题鉴定会。国家科委、冶金部利。技司、船总等单位的领导及用户代表参加了此次鉴定...     

中国搅拌摩擦焊技术的研究

综合评述了我国搅拌摩擦焊的研究成果和不足之处,包括接头的微观组织和力学性能、材料的流动行为、焊接热循环和温度场以及焊接设备等方面的内容。在此基础上,指出了进一步研究的方向,例如,微观组织研究应深入到沉淀相、织构和位错的尺度上,接头性能研究应从工程应用角度出发,材料流动行为和温度分布研究的重点应放在更深层次的理论研究和分析上。     

An evaluation of the statistics of steel material model parameters

In robustness studies, variations of material properties are often represented by simple assumptions, such as scaling of stress-strain relations, often due to lack of knowledge or deeper understanding of the material physics and the material model applied. By performing material characterisation tests on several batches of a DP600 steel and fitting a phenomenological material model to each batch, this paper studies the dispersion of material model parameters, as well as correlations between both experimental and model parameters. It is concluded that some of the characterisation tests may be omitted in the future, due to correlations found between parameters. The results may also be applied in a robustness study by inversely using the retrieved statistics to generate reasonable new sets of material model parameters. The methodology presented may be adopted for any other type of material characterisation process.     

A Materiomics Approach to Spider Silk: Protein Molecules to Webs

The exceptional mechanical properties of hierarchical self-assembling silk biopolymers have been extensively studied experimentally and in computational investigations. A series of recent studies has been conducted to examine structure–function relationships across different length scales in silk, ranging from atomistic models of protein constituents to the spider web architecture. Silk is an exemplary natural material because its superior properties stem intrinsically from the synergistic cooperativity of hierarchically organized components, rather than from the superior properties of the building blocks themselves. It is composed of beta-sheet nanocrystals interspersed within less orderly amorphous domains, where the underlying molecular structure is dominated by weak hydrogen bonding. Protein chains are organized into fibrils, which pack together to form threads of a spider web. In this article we survey multiscale studies spanning length scales from angstroms to centimeters, from the amino acid sequence defining silk components to an atomistically derived spider web model, with the aim to bridge varying levels of hierarchy to elucidate the mechanisms by which structure at each composite level contributes to organization and material phenomena at subsequent levels. The work demonstrates that the web is a highly adapted system where both material and hierarchical structure across all length scales is critical for its functional properties.     

钛硅共晶金属陶瓷的发展与展望

从钛硅二元相图及金属间化合物-Ti5si3的性能出发,分析钛硅共晶金属陶瓷优良的铸造性能、机械性能及存在的问题;报导国外对钛硅合金研究的最新成果以及该合金的应用前景。     

Effect of Friction Stir Welding on Pitting and Stress Corrosion Cracking Behavior of AFNOR7020-T6 Aluminium Alloy

Present work mainly focused on the pitting and stress corrosion cracking behavior of AFNOR7020 aluminium alloy friction stir welds and compared those results with the base material. Initially, microstructural studies, TEM, microhardness tests, tensile tests and general corrosion properties of the welds were investigated. The elongated grains present in the base material have been transformed into superfine grains in the weld nugget. Transmission electron micrographs obtained from various regions of the weld indicated that almost all strengthening precipitates dissolved in the nugget region while partial dissolution of precipitates occurred in the thermo-mechanically affected zone and coarsening occurred in heat affected zone. Hardness in the weld nugget was found to be very nearer to the base material without considerable difference. The welds showed superior joint efficiency of 85% in terms of the yield strength and 95% in terms of ultimate tensile strength. General corrosion resistance of the welds was better than that of the base material at different pH value and spraying time. Pitting corrosion studies revealed that less significant difference in pitting corrosion resistance has been observed between the weld nugget and the base material. It was found that the susceptibility towards stress corrosion cracking is relatively more in base metal compared to welded joints. It has been concluded that friction stir welding plays a very important role in corrosion properties of the AFNOR7020 aluminium alloy.     

马氏体钢的焊接工艺

基于钢板的化学性能及热处理交货条件,分析了该材料的焊接特点,研究了其焊接工艺,并针对其实船运用出现的问题,提出了修补措施.     

超疏水表面技术在腐蚀防护领域中的研究进展

提高材料表面疏水性有利于降低其与水分等腐蚀性介质的相互作用,从而增强材料的耐腐蚀性。近年来,超疏水表面由于其非润湿性、自清洁性等特殊表面性质而受到广泛的关注,并且越来越多的研究已经将超疏水表面应用于腐蚀防护领域。材料表面的浸润性主要取决于表面化学性质及表面微观结构,因此提高材料表面的疏水性也往往通过降低材料的表面能、改变表面微观结构这两个方面入手。阐述了超疏水表面的浸润性机理,介绍了不同建立表面微观粗糙结构,增强材料疏水/超疏水性的方法,总结了超疏水表面技术在腐蚀防护领域的最新进展和存在的一些问题,并展望了超疏水防腐表面技术的未来发展方向。     

气化炉用SA-387Gr11CL2钢国产焊材试验研究

针对煤化工设备中气化炉主壳体用SA-387Gr11CL2钢,进行了不同厂家相应国产焊接材料力学性能的试验研究,并与日本神户制钢同等级焊接材料进行对比分析,发现通过与焊材厂家合作改变焊材配方,添加对机械性能有益的合金元素,能够使国产焊材满足生产要求,并展望了国产焊材未来的研究方向和应用前景。     

Fe-Si-B非晶粉末及其磁粉芯研制进展概述

本文概述了带材破碎制备Fe78Si9B13非晶合金粉末及其磁粉芯的制备与性能研究;铁硅硼合金是制备磁粉芯的理想原料;球磨气流复合破碎法是带材破碎制粉的有效途径之一;通过不同磁导率非晶磁粉芯产品的磁性能测试,证明Fe78Si9B13非晶磁粉芯是综合性能良好的一种新型磁粉芯.     

海洋钻井平台升降腿焊接工艺及抗层状撕裂性能的研究

针对屈服强度为690 MPa的Z向钢制造的海洋平台升降腿,研究了二氧化碳气体保护焊和焊条电弧焊这两种不同焊接方法焊接工艺及焊接变形、焊接接头的组织及力学性能、母材的层状撕裂敏感性等.通过试验对比,选择合理的焊接方法和焊接材料,制订合理的焊接工艺,为海洋平台升降腿的制造提供了理论和试验依据.