Effects of Rare Earth Doping on the Properties of γ-Fe_2O_3 Magnetic Powder

ＥｆｆｅｃｔｓｏｆＲａｒｅＥａｒｔｈＤｏｐｉｎｇｏｎｔｈｅＰｒｏｐｅｒｔｉｅｓｏｆγ－Ｆｅ_２Ｏ_３ＭａｇｎｅｔｉｃＰｏｗｄｅｒ￥ＺｅｎｇＨｕａｎ－Ｘｉｎｇ；ＲｅｎＦｕ－Ｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅ...     

Effect of CeCl_3 on the Photosynthetic Characteristics of Spirulina Platensis

ＥｆｆｅｃｔｏｆＣｅＣｌ_３ｏｎｔｈｅＰｈｏｔｏｓｙｎｔｈｅｔｉｃＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＳｐｉｒｕｌｉｎａＰｌａｔｅｎｓｉｓ￥ＣｈｕＺｈｏｎｇ－Ｘｉ；ＭｕＭｅｎｇ－Ｈｕａ；ＺｈａｎｇＨｅ－Ｍｉｎ；ＧａｏＤｅ－Ｌｕ；ＷｕＺｈａｏ－Ｍｉｎｇ（?..     

High T_c Superconductivity of Mixed Rare Earth Er-Ba-Cu-O System

ＨｉｇｈＴ_ｃＳｕｐｅｒｃｏｎｄｕｃｔｉｖｉｔｙｏｆＭｉｘｅｄＲａｒｅＥａｒｔｈＥｒ－Ｂａ－Ｃｕ－ＯＳｙｓｔｅｍＸｕＤｉ（徐涤）；ＬｉＸｉａｏ－Ｘｉａｎ（李晓贤）；ＹｕＺｈｉ－Ｄｏｎｇ（喻志东）（ＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓ，Ｊ?..     

Potentiostatic Etching and Etching Quantitative Analysis of Carbidesin Die Steel

ＰｏｔｅｎｔｉｏｓｔａｔｉｃＥｔｃｈｉｎｇａｎｄＥｔｃｈｉｎｇＱｕａｎｔｉｔａｔｉｖｅＡｎａｌｙｓｉｓｏｆＣａｒｂｉｄｅｓｉｎＤｉｅＳｔｅｅｌＭＡＸｉａｎｇ，ＬＵＯＳｕＪｕａｎＰｏｔｅｎｔｉｏｓｔａｔｉｃＥｔｃｈｉｎｇａｎｄＥｔｃｈｉｎｇＱｕａｎｔｉ...     

Hydrogen Storage Alloy Pair as a Bus Air Conditioner

ＨｙｄｒｏｇｅｎＳｔｏｒａｇｅＡｌｌｏｙＰａｉｒａｓａＢｕｓＡｉｒＣｏｎｄｉｔｉｏｎｅｒ￥ＷａｎｇＸｉｎ－Ｈｕａ；ＣｈｅｎＣｈａｎｇ－Ｐｉｎ；ＹａｎＭｉ；ＷｕＪｉｎｇ；ＷａｎｇＱｉ－Ｄｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａ...     

Scanning Analysis of REE in Bastnaesite with Synchrotron Radiation X－Ray Fluorescence Microprobe

ＳｃａｎｎｉｎｇＡｎａｌｙｓｉｓｏｆＲＥＥｉｎＢａｓｔｎａｅｓｉｔｅｗｉｔｈＳｙｎｃｈｒｏｔｒｏｎＲａｄｉａｔｉｏｎＸ－ＲａｙＦｌｕｏｒｅｓｃｅｎｃｅＭｉｃｒｏｐｒｏｂｅＡｎＱｉｎｇｘｉａｎｇ（安庆骧）；ＷａｎｇＲｕｉｂｉｎｇ（王锐兵）；ＤｅｎｇＳａ...     

Heterogeneous Nuclei of Intergrowth Eutectic in Austenite-Bainite Steel Modified by Ce and Al

ＨｅｔｅｒｏｇｅｎｅｏｕｓＮｕｃｌｅｉｏｆＩｎｔｅｒｇｒｏｗｔｈＥｕｔｅｃｔｉｃｉｎＡｕｓｔｅｎｉｔｅＢａｉｎｉｔｅＳｔｅｌＭｏｄｉｆｉｅｄｂｙＣｅａｎｄＡｌＸｕＺｈｅｎｍｉｎｇ（许振明）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＥｎｇｉｎｅｒ...     

Evaluation of Component Activities in C-Mn-Fe-Si with Model Self-SReM4

ＥｖａｌｕａｔｉｏｎｏｆＣｏｍｐｏｎｅｎｔＡｃｔｉｖｉｔｉｅｓｉｎＣ┐Ｍｎ┐Ｆｅ┐ＳｉｗｉｔｈＭｏｄｅｌＳｅｌｆ┐ＳＲｅＭ４ＺｈａｎｇＸｉａｏｂｉｎｇ，ＪｉａｎｇＧｕｏｃｈａｎｇ，ＤｉｎｇＷｅｉｚｈｏｎｇ，ＸｕＫｕａｎｇｄｉ①ＡＢＳＴＲＡＣＴＡｓｕｂ...     

Effect of Rare Earth Elements on Austenite Growth Dynamics of Steel 9Cr2Mo

ＥｆｆｅｃｔｏｆＲａｒｅＥａｒｔｈＥｌｅｍｅｎｔｓｏｎＡｕｓｔｅｎｉｔｅＧｒｏｗｔｈＤｙｎａｍｉｃｓｏｆＳｔｅｅｌ９Ｃｒ２ＭｏＹａｎｇＱｉｎｇｘｉａｎｇ；ＷａｎｇＡｉｒｏｎｇ；ＧａｏＭｉｎｇ；ＷｕＨａｏｑｕａｎ；ＧｕｏＴｉｅｂｏＧａｏＭｉing;Ａｂｓｔ...     

Studies on Rare Earth Complexes with Ethylene-1,2-Dioxydiacetic Acid

ＳｔｕｄｉｅｓｏｎＲａｒｅＥａｒｔｈＣｏｍｐｌｅｘｅｓｗｉｔｈＥｔｈｙｌｅｎｅ－１，２－ＤｉｏｘｙｄｉａｃｅｔｉｃＡｃｉｄＸｕｅＷｅｎ－Ｍｅｉ；（薛文梅）；ＣｕｉＹｕ－Ｘｉｎ；（崔育新）；ＹａｎｇＲｕ－Ｄｏｎｇ；（杨汝栋）（ＤｅｐａｒｔｍｅｎｔｏｆＣ...     

稀土Y与喷射沉积技术对铝铁合金组织和性能的影响

普通凝固条件下得到的铸造Al-Fe合金中存在粗大的针状或片状初生富铁相,严重割裂基体,引起应力集中,恶化合金性能。利用稀土Y对Al-6Fe合金进行微合金化处理,结合快速凝固技术,并辅以热挤压技术,获得较常规凝固条件下更加细小均匀的显微组织,以解决铝铁合金中粗大的针片状富铁相割裂基体的问题。实验结果表明,稀土元素Y抑制了初生富铁相生长的趋势,将粗大针片状富铁相细化为菱形和短棒状,一定程度上减小了合金的第二相尺寸;稀土Y微合金化结合快速凝固技术,使得铝铁合金中形成了细小弥散的三元Al-Fe-Y金属间化合物,极大细化了第二相,在改善组织形貌的同时提升了合金的硬度和屈服强度。      

高能球磨稀土高硅铝合金粉末性能表征

对快速凝固法制备得到的Al-20Si-0.35RE合金进行不同时间的高能球磨, 然后对球磨后的粉末进行多次热压变形, 采用XRD, ESEM以及TEM等表征变形前后合金粉末的显微组织, 并对变形后合金的导电性能进行了研究. 研究发现快速凝固Al-20Si-0.35RE合金粉末的显微组织主要由细小的Al-Si固溶体(0.3～0.5 μm)、初晶硅、稀土铝硅化合物(0.16～0.3 μm)组成; 随着球磨时间延长, 颗粒粒径显著减小; 经过多次热压变形后合金晶粒显著细化, 晶格畸变减小, 位错钉扎稀土化合物, 形成类似表面渗流效应, 合金导电率提高至70%IACS.     

Study on Improving Solidification Structure of Rare Earth Al-Si Alloys with Electropulse Acting on Liquid Alloy

Electropulse modification (EPM) process, a new physical field method for improving the solidification structure of metals was introduced.Different from other research, EPM is only acting pulse current on melt under liquid state.The solidification structure of Al-Si alloys, A1-Cu alloys,cast iron and steel can be modified obviously with this method: the solidification structure of ZL101 alloy presented the Na and Sr modification and the mechanical properties were enhanced; a large number of primary silicon appeared in the microstructure of ZL109 alloy; the equiaxed grain zone was expanded and the grains were fined in Al-5.0wt% Cu alloy; the graphitization took place in solidification process of molten cast iron; the grain sizes of solidification structure of T8 steel were reduced significantly and the shape of steel pearlites also changed; the equiaxed grain zone increased to 88% from original untreated 19%, the equiaxed grains were fined and the intercrystalline crack was avoided in concasting billet by continuously treating liquid electrical sheet steel in tundish.Effects of rare earths on casting Al-Si alloys were also summarized.The method of modifying the solidification structure of rare earth Al-Si alloys with EPM in producing the alloys was proposed.     

Ce对Al4.5Cu合金流动性和热裂倾向的影响

研究加入稀土Ce对Al4.5Cu合金流动性、凝固收缩、微观组织和热裂倾向的影响。结果表明,适量稀土Ce的加入,降低金属液的黏度,提高合金流动性,减少金属在凝固过程中的收缩,抑制合金枝晶化的趋势,改善铸造合金的微观组织,净化合金,提高合金的导热率,明显地减少合金的热裂倾向。稀土Ce加入量为4%时,Al4.5Cu合金流动性最佳、凝固收缩量最小、合金晶粒组织细化圆整,同时其热裂倾向最小。     

稀土对Al-Mg合金铸态组织的影响

将混合稀土和La加入Al—Mg合金中。研究混合稀土和La在Al—Mg合金中的作用。结果表明，混合稀土和La对A1-Mg合金都起细化晶粒作用，其主要机理是稀土的加入引起凝固过程中溶质再分配造成固液界面前沿成分过冷度增大，但La的细化效果更明显。     

稀土钡镁硅铁合金物相和显微组织分析

在成分（ｗｔ％）为ＲＥ２．９１、Ｂａ３．８５、Ｍｇ９．７０：Ｃａ２．２、Ａｌ１．５，余量为Ｆｅ的范围内，运用Ｘ－射线衍射分析及电子探针分析手段对ＲＥＢａＭｇＳｉＦｅ合金的物相和显微组织进行了分析。发现了稀土和碱土金属之间在硅基中的互溶现象并对其进行了初步鉴别。     

Effect of Rare Earth on Microstructure of γ-TiAl Intermetallics

The rare earth (RE) elements (Ce, La) were added to binary Ti-47% Al alloys (atomic fraction) by Induction Skull Melting. The element Ce of 1.0 atomic percent was added individually, and La of 0.2 atomic percent was added individually. This article studied the influences of rare earth metal (Ce, La) on microstructure of as-cast TiA1 based alloy by XRD, SEM, EMPA and TEM measurement methodology. The results show that most of rare earth-rich phases (AlCe, Al-La) are uniformly distributed in grain boundary in the shape of discontinuous network, and some particles of rare earthrich phases within the grains are mainly ellipsoids. In addition, rare earth element can obviously refine the grain size and the lamellar thickness of as-cast TiAl based alloy samples. The grain size of Ti-47Al-1.0Ce-0.2La alloy reaches about 30～80μm, and the lameUar thickness of its γ phase and α2 phase are less than 200 and 20nm, respectively.     

Modification of Cast Al-Mg<Subscript>2</Subscript>Si Metal Matrix Composite by Li

The effects of both Li modification and cooling rate on the microstructure and tensile properties of an in-situ prepared Al-15 pct Mg₂Si composite were investigated. Adding 0.3 pct Li reduced the average size of Mg₂Si primary particles from ~30 to ~6 μm. The effect of cooling rate was investigated by the use of a mold with different section thicknesses from 3 to 9 mm. The results show a refinement of primary particle size as a result of both Li additions and cooling rate increases, and their effects are additive. Similarly, both effects increased ultimate tensile stress (UTS) and elongation values. The thin sections show somewhat unexpectedly low and scattered tensile results attributed to the casting defects observed in fracture surfaces. The Li-modified alloy displays serrated yielding behavior that is not fully explained here. The refinement by Li and enhanced cooling rate is explained in terms of an analogy with the effect of Sr and cooling rate in Al-Si alloys, and is ultimately attributed to the effect of the alkali and alkaline earth metals deactivating oxide double films (bifilms) suspended in Al melts as favored substrates for intermetallics.     

稀土在汽车用先进高强钢中的研究现状

成分设计与优化是先进高强钢增强、增塑以及增韧的关键技术之一。随着钢质高纯化装备和技术的进步与发展,稀土元素在钢中的应用已由净化、夹杂物改性逐步向微合金化过渡。从第一代铁素体基软钢和高强低合金钢向第二代奥氏体基超高强钢,再到多相、亚稳和多尺度组织调控的第三代高强韧性钢,先进高强钢的微合金化技术一直是控制组织和性能的有效举措。稀土原子具备较大原子半径以及与O、S的高亲和力等优异特性,可从控制凝固与固态相变,影响碳元素与合金元素的扩散等多方面影响先进高强钢的组织结构,从而对其力学性能、成形性能以及耐腐蚀等服役性能产生显著影响。本文阐述了稀土元素分别在第一代、第二代和第三代典型先进高强钢中的作用机理,并展望了稀土元素在未来汽车钢中的应用前景。      

Influence of Ti and C on the Solidification Microstructure of Fe-10Al-5Cr Alloys

The influence of Ti and C on the solidification microstructure of Fe-10Al-5Cr (all composition values in weight percent) alloys was examined with solidification modeling and a variety of experimental techniques. Several Fe-10Al-5Cr-Ti-C alloys were fabricated using the arc button melting process and characterized using quantitative image analysis and electron microscopy techniques. The experimental alloys exhibited primary ferrite dendrites with an interdendritic ferrite/TiC eutectic constituent, and the amount of eutectic was affected by the Ti and C concentrations. A liquidus projection and primary solidification paths were calculated for the Fe-10Al-5Cr-Ti-C system in order to estimate the amount of TiC that is expected to form during solidification. The range in the calculated amount of TiC-containing eutectic matched the experimentally measured values reasonably well. The ability to control the amount of TiC that forms during solidification of an Fe-10Al-5Cr-Ti-C-based alloy shows promise for developing corrosion-resistant weld overlay claddings with resistance to hydrogen cracking.