PROCESS CHARACTERISTICS OF HoBa_2Cu_3O_（7－δ） AND EFFECT OF MAGNETIC FIELD ON SUPERCONDUCTIVITY OF REBa_2Cu_3O_（7－δ） （RE＝Y，Ho）

ＰＲＯＣＥＳＳＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＨｏＢａ_２Ｃｕ_３Ｏ_（７－δ）ＡＮＤＥＦＦＥＣＴＯＦＭＡＧＮＥＴＩＣＦＩＥＬＤＯＮＳＵＰＥＲＣＯＮＤＵＣＴＩＶＩＴＹＯＦＲＥＢａ_２Ｃｕ_３Ｏ_（７－δ）（ＲＥ＝Ｙ，Ｈｏ）￥Ｙｉ，Ｊｉａｎｈｏｎｇ；Ｐｅｎ...     

MAGNETOSTRICTIVE BEHAVIOUR OF R（Fe_（1－x）Al_x）_y ALLOYS（R＝Dy_（0．65）Tb_（0．25）Pr_（0．1））

ＭＡＧＮＥＴＯＳＴＲＩＣＴＩＶＥＢＥＨＡＶＩＯＵＲＯＦＲ（Ｆｅ_（１－ｘ）Ａｌ_ｘ）_ｙＡＬＬＯＹＳ（Ｒ＝Ｄｙ_（０．６５）Ｔｂ_（０．２５）Ｐｒ_（０．１））￥ＷＡＮＧＢｏｗｅｎ;ＷＵＣｈａｎｇｈｅｎｇ;ＺＨＵＡＮＧＹｕｚｈｉ;ＪＩＮＸｉｍｅｉ;ＬＩＪｉ...     

PHASE RELATIONSHIPS IN R－Fe PSEUDOBINARY SYSTEM （R＝Dy_（0．65）Tb_（0．25）Pr_（0．1））

ＰＨＡＳＥＲＥＬＡＴＩＯＮＳＨＩＰＳＩＮＲ－ＦｅＰＳＥＵＤＯＢＩＮＡＲＹＳＹＳＴＥＭ（Ｒ＝Ｄｙ_（０．６５）Ｔｂ_（０．２５）Ｐｒ_（０．１））￥ＷＡＮＧＢｏｗｅｎ;ＷＵＣｈａｎｇｈｅｎｇ;ＺＨＵＡＮＧＹｕｚｈｉ;ＪＩＮＸｉｍｅｉ（Ｉｎｓｔｉｔｕｔｅｏ?..     

MICROSTRUCTURE AND PROPERTIES OF Al_2O_3sf／Al－1．5Mg COMPOSTITE MANUFACTURED BY EXTRUSION DIRECTLY FOLLOWING LIQUID INFILTRATION

ＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＰＲＯＰＥＲＴＩＥＳＯＦＡｌ_２Ｏ_３ｓｆ／Ａｌ－１．５ＭｇＣＯＭＰＯＳＴＩＴＥＭＡＮＵＦＡＣＴＵＲＥＤＢＹＥＸＴＲＵＳＩＯＮＤＩＲＥＣＴＬＹＦＯＬＬＯＷＩＮＧＬＩＱＵＩＤＩＮＦＩＬＴＲＡＴＩＯＮＨｕＬｉａｎｘｉ；Ｌｕ...     

HEAT CAPACITIES OF Fe_（40）Ni_（40）B_（20） GLASSY ALLOY MEASURED BY ENTHALPY METHOD

ＨＥＡＴＣＡＰＡＣＩＴＩＥＳＯＦＦｅ_（４０）Ｎｉ_（４０）Ｂ_（２０）ＧＬＡＳＳＹＡＬＬＯＹＭＥＡＳＵＲＥＤＢＹＥＮＴＨＡＬＰＹＭＥＴＨＯＤ￥ＪＩＡＮＧＱｉｎｇ;ＺＨＡＯＭｉｎｇ;ＬＩＪｉａｎｃｈｅｎ（ＪｉｌｉｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌ?..     

DESIGN AND PREPARATION OF SILICON NITRIDE COMPOSITE WITH HIGH FRACTURE TOUGHNESS AND NACRE STRUCTURE

ＤＥＳＩＧＮＡＮＤＰＲＥＰＡＲＡＴＩＯＮＯＦＳＩＬＩＣＯＮＮＩＴＲＩＤＥＣＯＭＰＯＳＩＴＥＷＩＴＨＨＩＧＨＦＲＡＣＴＵＲＥＴＯＵＧＨＮＥＳＳＡＮＤＮＡＣＲＥＳＴＲＵＣＴＵＲＥＹＨｕａｎｇ；Ｈ．ＮＨａｏ；Ｙ．Ｌ．ＣｈｅｎａｎｄＢ．Ｌ．Ｚｈｏｕ（１）Ｄｅ...     

DEPENDENCE OF SINTERABILITY ON STATE OF AGGLOMERATION OF ULTRAFINE ZrO_2，（Y_2O_3） POWDERS

ＤＥＲＳＤＥＰＥＮＤＥＮＣＥＯＦＳＩＮＴＥＲＡＢＩＬＩＴＹＯＮＳＴＡＴＥＯＦＡＧＧＬＯＭＥＲＡＴＩＯＮＯＦＵＬＴＲＡＦＩＮＥＺｒＯ_２，（Ｙ_２Ｏ_３）ＰＯＷＤＥＲＳ￥Ｇｅ，Ｒｏｎｇｄｅ；Ｌｉｕ，Ｚｈｉｈｏｎｇ；Ｃｈｅｎ，Ｈｕｉｇｕａｎｇ；Ｚｈａｎｇ，...     

ACTIVATION MECHANISM OF AMORPHOUS Ni_（63）Zr_（32）La_5 ALLOY HYDROGENATION CATALYST

ＡＣＴＩＶＡＴＩＯＮＭＥＣＨＡＮＩＳＭＯＦＡＭＯＲＰＨＯＵＳＮｉ_（６３）Ｚｒ_（３２）Ｌａ_５ＡＬＬＯＹＨＹＤＲＯＧＥＮＡＴＩＯＮＣＡＴＡＬＹＳＴ￥Ｘ．Ｋ．Ｗａｎｇ．Ｎ．Ｆ．ＳｈｅｎａｎｄＧ．ＪＬｅｉ（Ｄｅｐｔ．ｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａ?..     

THE EFFECT OF SILICON ADDITIVE ON THESTRUCTURE AND PROPERTIES OFC－B_4C－SiC COMPOSITE

ＴＨＥＥＦＦＥＣＴＯＦＳＩＬＩＣＯＮＡＤＤＩＴＩＶＥＯＮＴＨＥＳＴＲＵＣＴＵＲＥ　ＡＮＤＰＲＯＰＥＲＴＩＥＳＯＦＣ－Ｂ_４Ｃ－ＳｉＣＣＯＭＰＯＳＩＴＥＨＵＡＮＧＱｉｚｈｏｎｇ;ＹＡＮＧＱｚａｏｑｉｎａｎｄＷＵＬｉｊｕｎ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇ?..     

DIFFUSION PHENOMENA AND MICROSTRUCTURE STABILITY OF Ni－Cr－Al－Y－Si COATING ON THENi_3Al BASED ALLOY SUBSTRATE

ＤＩＦＦＵＳＩＯＮＰＨＥＮＯＭＥＮＡＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＴＡＢＩＬＩＴＹＯＦＮｉ－Ｃｒ－Ａｌ－Ｙ－ＳｉＣＯＡＴＩＮＧＯＮＴＨＥＮｉ_３ＡｌＢＡＳＥＤＡＬＬＯＹＳＵＢＳＴＲＡＴＥＺ．Ｐ．Ｘｉｎｇ;Ｙ．Ｆ．Ｈａｎ;Ｙ．Ｌ．ＪｉａｎｄＭ．Ｇ?..     

Fe73.5Cu1Nb3-xTixSi13.5B9 (x=0, 1, 2, 3)合金粉的结构与磁性

将Fe73.5Cu1Nb3-xTixSi13.5B9(x=0,1,2,3)合金快淬带进行高能球磨制成粉末样品,在550℃真空退火1h,研究了磁粉的相结构及磁性。结果表明,随球磨时间延长,不添加Ti的Fe73.5Cu1Nb3Si13.5B9合金中析出晶化相的晶格常数增大。添加Ti的Fe73.5Cu1Nb3-xTixSi13.5B9(x=0,1,2,3)合金在球磨60h后再退火,可以得到单一α-Fe(Si)软磁相,且随Ti含量增大,析出晶化相的晶格常数减小,饱和磁化强度增大、矫顽力降低。     

Fe基非晶及纳米晶合金的制备和电化学腐蚀行为

分别采用单辊甩带法和非晶晶化退火法制备出非晶及纳米晶合金Fe73.5Si13.5B9Nb3Cu1;利用DSC、XRD和TEM对该非晶合金的晶化行为进行了分析;并用电化学极化曲线的方法和电化学阻抗技术研究了该非晶合金经不同温度退火后在1mol/LHCl溶液里的电化学腐蚀行为。结果表明,该非晶合金的晶化过程出现2个阶段。当退火温度为500℃时,合金尚未晶化,仍保持非晶态;当温度达到550℃时,出现了晶化衍射峰,晶粒平均直径约13nm;当温度达到600℃时,晶粒平均直径约为15nm。经过退火得到的纳米晶合金的腐蚀电位大于未退火的非晶,且阳极电流密度变得更低,表明纳米晶状态时的耐腐蚀性能比非晶状态的更好。该非晶合金未退火、550℃退火和600℃退火时的EIS均由单一容抗弧构成,具有一时间常数;且随着退火温度升高,电化学反应电荷转移电阻在增大。     

FeCuMoSiB合金穆斯堡尔谱研究

用Ｘ射线衍射技术和穆斯堡尔谱技术，研究了Ｆｅ７３．５ＣｕＭｏ３Ｓｉ１３．５Ｂ９合金的结构和超业细相互作用。该合金的相组成为α－Ｆｅ（Ｓｉ）纳米晶和边界相即五余非晶相。典型纳米晶状态下的穆斯堡尔谱由５条亚谱构成，其中４条亚谱为６峰谱，对应α－Ｆｅ（Ｓｉ）相中的４种不同环境的Ｆｅ原子。另１条亚谱对应边界处的非晶相，研究了非晶带材经５００－６００℃不同温度晶化处理后的穆斯堡尔谱特性。     

Effect of preannealing on crystallization process of amorphous Sm5Fe80Cu1Si5B3C2.5Zr3.5 alloy

In the view of crystallization activation energy of amorphous alloy,the mechanism of coarse grain in annealed Sm5Fe80Cu1Si5B3C2.5ZR3.5 amorphous alloy was analyzed.It reveals the e4ffect of preannealing on the process crystallization.The results show that preannealing can be used to change the crystallization behavior of the α-Fe phase in the Sm5Fe80Cu1Si5B3C2.5Zr3.5 amorphous alloy,whick is helpful for forming α-Fe phase grains;and it is not large for Sm2Fe17Cx phase.     

预退火对Fe73.5Cu1Mo3Si13.5B9非晶合金的晶化及磁性的影响

本文研究了预退火温度和时间对Ｆｅ(７３．５)Ｃｕ１Ｍｏ３Ｓｉ(１３．５)Ｂ９非晶合金在最后退火过程中发生的 晶化及软磁性能的影响。结果表明：在较低温度下预退火能有效地控制合金的晶化过程,降低了最 后退火时所放出的晶化潜热。该合金在４５０℃进行１ｈ预退火发生部分晶化,释放约３２％的晶化 潜热,再经５１０℃保温１ｈ最后退火其磁性能与制备态样品经５１０℃退火后的磁性能相比,最大磁 导率ｍ显著提高,矫顽力Ｈｃ明显下降,Ｂｓ和Ｂｒ无明显变化。     

ATOMIC SCALE MECHANISM OF RESTRAINED EMBRITTLEMENT IN AMORPHOUS Fe_(78)B_(13)Si_9 ALLOY BY ELECTRIC PULSE RAPID ANNEALING

1.IntroductionTheiron-basedamorphousalloysproducedviarapidquenchingtechniquepossessgoodmechanicalproperties.However,toacquiredesirablesoftmagneticproperties,alongperiodofconventionalfurnaceannealing(CFA)(1-2h)isrequired.Unfortunately,theannealingembrittlementoccursinevitablytocreatemanydifficultiesinpractice.Flashannealingorelectricpulserapidannealing(EPRA)isbasedonthejouleheatingeffectsofatransientcurrentpulseflowinginanamorphousribbon.RecentlyithasbeenprovedthatEPRAisasuitablemethodfori…     

HIGH-TEMPERATURE AC MAGNETIC PROPERTIES OF NANOCRYSTALINE FINEMET ALLOYS WITH Co ADDITION

High-temperature AC magnetic properties for (Fe0.5Co0.5)73.5Cu1Nb3Si13.5B9 alloy annealed at various temperatures have been investigated using an impedance analyzer. Annealing temperature Ta has obvious effects on high-temperature AC magnetic properties of the alloy. The Hopkinson peak appears only in the amorphous alloy when Ta ≤ 703K. As Ta increases above 733K, the real part of the complex initial permeability μi' descends gradually, μi' decreases more slowly with temperature in the high temperature range. The high-temperature (about 750K) AC initial permeability for the alloy annealed at Ta=763K has been found to maintain a stable high value of 950 up toa frequency of～ 1 × 105Hz Partial substitution of Co for Fe in the Fe73.5Cu1Nb3Si13.5B9 alloy leads to an increase of around 110K of the Curie temperature of the amorphous phase, much higher than Ge-containing Finemet alloy.     

HIGH-TEMPERATURE AC MAGNETIC PROPERTIES OF NANOCRYSTALLINE FINEMET ALLOYS WITH Co ADDITION

High-temperature AC magnetic properties for (Fe0.5Co0.5)73.5Cu1Nb3Si13.5B9 alloy annealed at various temperatures have been investigated using an impedance analyzer. Annealing temperature Ta has obvious effects on high-temperature AC magnetic properties of the alloy. The Hopkinson peak appears only in the amorphous alloy when Ta ≤ 703K. As Ta increases above 733K, the real part of the complex initial permeability μi' descends gradually, μi' decreases more slowly with temperature in the high temperature range. The high-temperature (about 750K) AC initial permeability for the alloy annealed at Ta=763K has been found to maintain a stable high value of 950 up to a frequency of ~ 1 × 105Hz. Partial substitution of Co for Fe in the Fe73.5Cu1Nb3Si13.5B9 alloy leads to an increase of around 110K of the Curie temperature of the amorphous phase, much higher than Ge-containing Finemet alloy.     

Effects of Zr on crystallization kinetics of Pr—Fe—B amorphous alloys

The effects of Zr on crystallization kinetics of Pr-Fe-B amorphous alloys have been investigated by DTA and XRD methods.It was found that for Pr8Fe86-xZrxB6(x=0,1,2)amorphous alloys,the final crystallized mixture is α-Fe and Pr2Fe14B,and the metastable Pr2Fe23B3 phase occurs during crystallization of Pr8Fe86B6 amorphous alloy,not during crystallization of Pr8Fe86-xZrxB6(x=1,2)amorphous alloys,By analyzing the activation energy of crystallization,the formation of an α-Fe/Pr2Fe14B composite microstructure with a coarse grain size in annealed Pr8Fe86B6 alloy,is attributed to a difficult nucleation and an easy growth for both the α-Fe and Pr2Fe14B in the alloy.The addition of Zr can be used to change the crystallization behavior of the α-Fe phase in Pr-Fe-B amorphous alloy,which is helpful to reduce the grain size for the α-Fe phase.     

测量非晶合金激活能的新方法

介绍了一种测量非晶晶化激活能的新方法－MTGA法。分别用DSC和MTGA研究了Fe73.5Cu1Nb3Si13.5B9非晶合金的晶化动力学。结果表明,MTGA法不但比DSC法能更加详细反映出晶化动力学和相变的过程,而且用DSC和MTGA测量的α－Fe(Si)相的晶化激活能基本一致。