Study on Annealing Embritlement of Fe-B-Si Amorphous Alloy

ＳｔｕｄｙｏｎＡｎｎｅａｌｉｎｇＥｍｂｒｉｔｌｅｍｅｎｔｏｆＦｅ┐Ｂ┐ＳｉＡｍｏｒｐｈｏｕｓＡｌｏｙＣａｏＸｉｎｇｇｕｏ①，ＧｕｏＺｅｃｈｅｎ①，ＣｈｅＸｉａｏｚｈｏｕ②，ＬｉｕＰｉｎｇ①，ＹｉｎＢｉａｏ①ＡＢＳＴＲＡＣＴＴｈｅｌａｗａｎｄａｃｔｉｖ...     

Effect of Cerium on the Properties of CuPNiSn Amorphous Alloys

CuPNiSn amorphous alloys are good brazing materials at medium temperature for replacementof silver bearing brazing materials.The crystallization temperature,wettability,tensile strength of Cu-Cujoints and the microstructure of joints for three compositional series are reported.Some rare earth elementswere added in two series.It has been found that grains are refined and the tensile strengths increase as in-creasing rare earth content.The results also show that the brittle fracture turns to plastic one for the jointswith reducing amount of(Ni+Sn),and the tensile strength is increased.     

Effect of Cerium on Microstructure and Electrochemical Performance of Ti-V-Cr-Ni Electrode Alloy

Effect of cerium on the microstructure and electrochemical performance of the Ti0.25V0.35-xCexCr0.1Ni0.3（x=0,0.005）electrode alloy was investigated by X-ray diffraction（XRD）,field emission scanning electron microscopy/energy dispersive X-ray spectrometry（FESEM-EDS）,and electrochemical impedance spectroscopy（EIS）measurements.On the basis of XRD and FESEM-EDS analysis,the alloy was mainly composed of V-based solid solution with body-centered-cubic structure and TiNi-based secondary phase.Ce did not exist in two phases,instead,it existed as Ce-rich small white particles,with irregular edges,distributed near the grain boundaries of the V-based solid solution phase.Discharge capacity,cycle stability,and high-rate discharge ability of the alloy electrode were effectively improved with the addition of Ce at 293 K.It was very surprising that the charge retention was abnormal with larger discharge capacity after standing at the open circuit for 24 h.EIS indicated that addition of Ce improved the dynamic performance,which caused the charge transfer resistance（RT）to decrease and exchange current density（I0）to increase markedly.The exchange current density of the electrochemical reaction on the alloy surface with Ce addition was about 2.07 and 3.10 times larger than that of the alloy without Ce at 303 and 343 K,respectively.The diffusion coefficient of hydrogen（D）in the bulk alloy electrode decreased with addition of Ce,but it did not decrease so much,and the apparent activation energy（△rH）was far higher than that of the AB5 type alloy.     

Effect of Cerium on the Viscosity of Liquid Fe-C Alloy of Eutectic Content

The viscosities of liquid Fe-4.30C and Fe-4.30C-Ce alloys were measured by oscillating crucible viscometer. The results show that viscosity of Fe-4.30C alloy changes from 5.50 to 8.30 MPa~s when the liquid is cooled from 1425℃ to the melting point. The abnormity of viscosity of Fe-4.30C alloy near the melting point is reasonable due to the formation of graphite. The addition of cerium especially with content higher than 0.21% causes an evidently decrease in viscosity for eutectic alloy resulting from increase of free volume and size decrease of atom cluster in the liquids. It can be concended that the existence of C-Ce compound contributes to the discontinuous of viscosity at 1340 ～ 1370 ℃ for the Fe-4.30C-Ce alloy by experinments with differential scanning calorimeter.     

Effects of Cerium Dopant on Ni-B Amorphous Alloy Catalysts Used in 2-Ethylanthraquinone Hydrogenation

A series of Ce-doped Ni-B amorphous alloy catalysts were prepared by a KBH4 reduction method, characterized by ICP, BET, XRD, H2-chemisorption, H2-TPD, etc., and tested in the hydrogenation of 2-ethylanthraquinone. The results of characterization show that with the addition of Ce the amount of H2-chemisorption and H2-TPD areas first increases markedly and then decreases with the maximum appears at the atomic ratio of Ce to Ni of 0.036. The hydrogenation activity also shows the same trend. The effects of Ce are attributed to its dispersion of Ni particles, resulting in the formation of more surface Ni centers. However, much higher Ce contents may result in the decrease of the surface Ni contents. After heat treatment at higher temperatures, the amorphous structure of Ni-B is destroyed.     

Effect of Cerium on Lithium-Aluminium Anode

ＥｆｆｅｃｔｏｆＣｅｒｉｕｍｏｎＬｉｔｈｉｕｍ－ＡｌｕｍｉｎｉｕｍＡｎｏｄｅＧｕａｎＣｏｎｇｓｈｅｎｇ（管从胜），ＤｕａｎＳｈｕｚｈｅｎ（段淑贞），ＺｈａｏＧｕａｎｇｗｅｎ（招光文）（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃａｌＣｈｅｍｉｓｔｒｙ，Ｕｎｉ...     

Effect of External Electric Field on Phase Selection and Stability of Amorphous （Nd0. 1 Fe0.9 ）3 B Alloy

Anexternalelectricfieldiswidelyusedtocontrolthemicrostructureandpropertiesofvariousmaterials ,suchasliquid crystallinepolymers[1,2 ] ,oxideglass es[3～ 5] ,ferroelectricmaterials[6 ,7] .Thesufficientlystrongelectricfieldcaninduceacholesteric to nemat icphasetransformationinliquidcrystallinepolymers .Thephaseseparationkineticsduetotheappliedelec tricfieldwasfirstreportedforoxideglassesbydeVekeyandMajumdar[8] .Subsequently ,Liuetal.systematicallystudiedtheeffectofanelectricfieldonthephasesepara…     

Influence of Cerium on Corrosion of AZ91 Magnesium Alloy

Effect of cerium addition on corrosion resistance of AZ91 magnesium alloy was investigated using the static weight loss and polarization curve method as well as metallographical observation. The results indicate that a small amount of cerium （0.2% - 0.8%） in AZ91 magnesium alloy can significantly reduce the corrosion rate, enhance the electrode voltage and lower corrosion current density in 3.5%NaCl aqueous solution, and AZ91-0.8% Ce alloy has better corrosion resistant performance. The reason for increasing corrosion resistance is attributed to the addition of Ce, refining the α-Mg grain, reducing the segregation of element Al, and improving the morphologies of β-Mg17 Al12 phases.     

Effect of Cerium on Microstructures of Hard Alloys

Microstructures and crack extending characteristic of the YG8R,YT5R and YT14R hard alloysadding a trace cerium were studied by AEM and HVEM with a tensile holder.In the hard alloys addingcerium,the compounds of Ce_2O_3 or Ce_2O_2S could be formed,extending of stacking faults and transforma-tion from fcc Co to hcp Co were suppressed,volume fraction of fcc Co in the alloys was increased,andstrength of Co and(TiW)C phases and grain boundaries were raised.Plastic deformation in Co phase nearedges of the tensile cracks was more strong,and the tensile cracks could pass through some smaller WCgrains.     

Effect of Yttrium and Cerium Addition on Microstructure and Mechanical Properties of AM50 Magnesium Alloy

To develop magnesium alloy with low cost, high strength and excellent elevated temperature properties, effect of Y and Ce addition on microstructure and mechanical properties of AM50 magnesium alloy was studied. Result showed that addition of small amount of Y and Ce to AM50 alloys resulted in refinement of microstructure. Owing to the improvement of microstructure, the mechanical properties of alloys at both ambient and elevated temperature were increased. AM50 alloy containing 0.6 % Ce-0.3 % Y （mass fraction） had good refinement effect and relatively ideal mechanical properties.     

Effect of Cerium on Chemical Short-Range Order of Al-Fe-Ce Amorphous Alloy

Ｉｎｒｅｃｅｎｔｙｅａｒｓ,Ｈｅｅｔａｌ.[1]ａｎｄＩｎｏｕｅｅｔａｌ.[2]ｄｉｓｃｏｖｅｒｅｄａｇｒｏｕｐｏｆａｍｏｒｐｈｏｕｓａｌｌｏｙｓｗｉｔｈａｌｕｍｉｎｕｍｃｏｎｔｅｎｔｃｌｏｓｅｔｏ90%(ａｔｏｍｆｒａｃｔｉｏｎ),ｗｈｉｃｈｐｏｓｓｅｓｓｅｘｃｅｌｌｅｎｔｓｐｅｃｉｆｉｃｓｔｒｅｎｇｔｈｉｎＡｌＴＭＲＥ(ＴＭ=ｔｒａｎｓｉｔｉｏｎｍｅｔａｌ)ｓｙｓｔｅｍｓ.Ｔｈｅｙｈａｖｅｕｐｔｏ500～1100ＭＰａｉｎｓｔｒｅｎｇｔｈａｎｄｇｏｏｄｄｕｃｔｉｌｉｔｙ.Ｈｏｗｅｖｅｒ,ｔｈｅｏｒｉｇｉｎｏｆＡｌｂａｓ…     

成分对非晶态Fe—B—Si合金退火脆化行为的影响

本文研究了Ｂ和Ｓｉ的含量及Ｆｅ／（Ｂ＋Ｓｉ）相对含量对非晶态Ｆｅ－Ｂ－Ｓｉ合金退火脆化行为的影响；分析了在常规热处理条件下，利用成分的变化，获得延性与磁性综合性能的可能性。实验结果表明，非晶态Ｆｅ－Ｂ－Ｓｉ合金的退火脆化行为具有较大的成分依赖性，位于Ｆｅ７９ａｔ％－８１ａｔ％，Ｂ１１ａｔ％，Ｓｉ８ａｔ％－９ａｔ％成分范围内的Ｆｅ－Ｂ－Ｓｉ非晶态合金的退火脆化敏感性最小，脆化仍发生于晶化开始之前...     

Effect of Cerium on Mechanical Properties and Morphology of ZZn4-1 Alloy

ＺＡａｌｌｏｙｓｂｅｌｏｎｇｔｏｃａｓｔｚｉｎｃａｌｌｏｙｆａｍｉｌｙｄｅｖｅｌｏｐｅｄｂｙＣａｎａｄｉａｎａｎｄＡｍｅｒｉｃａｎｒｅｓｅａｒｃｈｅｒｓｉｎｍｉｄ1970ｓ.ＺＡａｌｌｏｙｓａｒｅｏｆｇｏｏｄｃａｓｔｉｎｇａｎｄｐｒｏｃｅｓｓｉｎｇｐｒｏｐｅｒｔｉｅｓａｎｄａｒｅｗｉｄｅｌｙｕｓｅｄｉｎｄｉｆｆｅｒｅｎｔｆｉｅｌｄｓ[1].ＨｙｐｏｅｕｔｅｃｔｉｃＺＺｎ41ａｌｌｏｙ,ａｓａｎｉｍｐｏｒｔａｎｔｍｅｍｂｅｒｏｆＺＡａｌｌｏｙｆａｍｉｌｙ,ｉｓｏｆｇｏｏｄｃａｓｔａｂｉｌｉｔｙａｎｄｔｈｕｓｉ…     

非晶态合金的脆化

本文综合论述了非晶态合金的脆化，尤其是非晶态软磁合金的退火脆化；分析了非晶合金退火脆化的起因和影响因素；并对解决合金退火脆化问题的途径进行了探讨。     

FeSiB非晶态合金的抗脆性研究

通过实验测定ＦｅＳｉＢ非晶态合金抗脆性与成分的关系,详细分析了合金产生脆性的原因,认为合金脆性受Ｓｉ、Ｂ含量及分布所控制,合理控制合金中的Ｓｉ、Ｂ含量,可使合金的抗脆性显著提高。     

Effect of Boron and Cerium on Microstructures and Properties of Cu-Fe-P Alloy

The effects of B and Ce on the removal of inclusions, microstructures, and properties of Cu-Fe-P alloys were studied. Certain impurity elements and the microstructures, mechanical properties, and conductivity of four experimental alloys, Cu-0.22Fe-0.06P, Cu-0.22Fe-0.06P-0.05Ce, Cu-0.22Fe-0.06P-0.02B, and Cu-0.22Fe-0.06P-0.05Ce-0. 02B （ %, mass fraction）, were tested and analyzed. Results show that on one hand, B and Ce have a remarkable function of removing S, Pb, and Bi from copper alloys ; on the other hand, the recrystallization temperature of the Cu-Fe-P alloy is considerably increased by adding trace B and Ce, resulting in the combined strengthening effect of precipitation hardening and cold work hardening after cold working and aging, while the negative effect of B and Ce on conductivity is slight. Therefore, a good combination of high strength and conductivity is achieved.