共查询到18条相似文献，搜索用时 500 毫秒
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采用机械合金化方法制备了Al82Fe5Zr5Ce8非晶态合金,用扫描电镜、X射线衍射、差热分析等方法分析了非晶态合金Al82Fe5Zr5Ce8的形貌、结构、热稳定性。结果表明：Al82Fe5Zr5Ce8混合粉末经过机械合金化球磨200h后达到了非晶状态。热分析表明非晶态Al82Fe5Zr5Ce8合金的晶化分两阶段进行,在723K和783K经8h的退火后,非晶态Al82Fe5Zr5Ce8合金达到了完全晶化状态,该状态下出现了很多种中间化合物相,经不同温度退火后晶化产物相基本相同。利用Kissinger方程分析了两个晶化过程的晶化激活能,对应过程的晶化激活能分别是475.6 k J/mol和408.8 k J/mol。 相似文献
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The hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass is studied from ambient temperature to the temperature over Tx （the onset crystallization temperature） using a hot macro-hardness tester and scanning electron microscopy （SEM）. The results show that the hot hardness behavior of Zr52.5Al10Ni10Cu15Be12.5 bulk metallic glass can be classified into 4 zones： the glassy zone in which the hardness almost linearly decreases with the increase of temperature, the viscoelastic zone in which the hardness is nearly unchanged, the viscous flow zone in which the hardness quickly tends towards near zero with temperature, and the crystallization zone in which the hardness sharply increases. The high temperature deformation behavior and the easy processable deformation region for bulk metallic glasses are also discussed on the basis of the hot marco-hardness. 相似文献
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研究了Cu掺杂对FeZrB非晶软磁合金薄膜的巨磁阻抗(GMI)效应的影响。研究发现，未掺Cu元素的Fe88Zr7B5非晶软磁合金薄膜和掺了4at％过量Cu的(Fe88Zr7B5)0．96Cu0.04非晶合金薄膜均无明显的GMI效应．掺了3at％适量cu的(Fe88Zr7B5)0．97Cu0.03非晶合金薄膜则具有显著的GMI效应，在13MHz的频率下，最大纵向巨磁阻抗比为17％，最大横向巨磁阻抗比11％． 相似文献
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采用磁控溅射方法在Si片沉积了Ti-50．9at％Ni形状记忆合金薄膜,并将薄膜分别在不同温度下进行退火．利用示差扫描量热方法（DSC）、X射线衍射仪（XRD）、透射电镜（TEM）研究了薄膜退火前后形貌、相变特征及应力随退火温度的变化．实验结果表明：溅射态薄膜为非晶态,其晶化温度范围为430℃-535℃,晶化同时伴随着Ti3Ni4相的析出;退火后的薄膜随着退火温度的升高,Rs、Af、Ms均呈上升趋势．薄膜的残余应力随着退火温度的增加而逐渐减少． 相似文献
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马云锐 《通化师范学院学报》2009,30(12):23-24
该文研究了采用机械合金化法制备Ni—Ti—Nb非晶态合金材料,用X射线衍射仪（XRD）、扫描电子显微镜（SEM）对经不同机械合金化时间得到的Ni—Ti—Nb混合粉末进行了分析,结果表明Ni—Ti—Nb混合粉末球磨10h后可实现机械合金化。随着球磨持续进行,Ni、Ti、Nb合金粉末之间相互扩散,当扩散速度增加到一定程度,来不及形成有序结构,而形成Ni—Ti—Nb系非晶合金． 相似文献
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利用较低纯度的原材料通过真空铜模吸铸法成功地制备了直径为2mm的（Fe0．5Co0．5）72B19．2Si4．8Nb4块体非晶合金。用X射线衍射（XRD）和示差扫描量热分析仪（DSC）研究了该非晶合金的晶化行为。结果表明,升温速率为10℃／min时,玻璃转变温度Tg为568．3℃,晶化起始温度Tx为598．6℃,晶化峰值温度Tp为608．0℃．随着升温速率的增加,特征温度Tg,Tx,Tp向高温区移动．用Kissinger法得到的玻璃转变激活能E。为272．3KJ／mo｜,晶化激活能E：为386．2KJ／too｜,晶化峰值激活能Ep为401．9KJ／mol,用Ozawa法得到的特征温度激活能与用Kissinger法得出的激活能变化趋势是一致的,都有Ep〉Ex〉Eg 此外,用Ozawa法分析了晶化激活能随晶化体积分数的关系,表明随着晶化体积分数的逐渐增加,激活能先增加,当晶化体积分数为14％时,激活能达到最大值379．4KJ／mol,然后随着晶化体积分数的逐渐增加,激活能减少。 相似文献
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采用分离式Hopkinson压杆装置(SHPB)和扫描电镜(SEM)技术研究了不同高应变率下Zr基非晶合金样品(Zr55Cu30Al10Ni5)的变形行为和断口形貌。研究发现与准静态压缩形变相比,高应变率水平(3400 s-1和1900 s-1)下,非晶合金样品断裂应力显著降低,最大降低约达40%。扫描电镜形貌观察表明,非晶合金的高速断裂发生在一条主剪切带上,主剪切面偏离45°最大切应力面。同时断口形貌为明显的脉络花样,并覆盖有大量液滴状和不规则形状熔融物,表明高应变率下断裂表面温升较准晶态断裂有所增加。 相似文献
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利用磁控溅射的方法在n型硅基底制备了Cu／CoN／Si（100）和Cu／CoSiN／Si（100）薄膜,并对它们进行了不同温度的退火．用原子力显微镜观察了它们的表面形貌．用扫描透射电镜能谱分析法得到了在不同退火温度下铜在上面两种薄膜中浓度与表面距离的分布,然后利用菲克第二定律对Cu／CoN／Si和Cu／CoSiN／Si体系中cu的扩散进行了计算和分析,得出中温条件（300℃-700℃）下Cu在CoN和CoSiN两种薄膜中的扩散系数表达式分别为8．98×10^-13exp（-0．45eV／kT）cHf／s和5．39×10^-11exp（-0．49eV／kT）Cm2／s． 相似文献
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《中学生理科月刊》1999,(12)
物质组成与分类（一）1．A2．C3．D4．B5．C6．C7．B8．A、C9．B、D10．Bll．D12．C13．C14．B15．A16．D17．A（二）1、氧2．碱碱、氧化物3．（）⑤（2）6（3）＠（4）＠4．0＠＠＠＠＠＠＠＠＠＠＠＠③③②①③②③②②①5．铝川对。6（从左到右、从上到下依次为）FeoHCINaHCO3KOHMgCI。Cu。（OH）人037．NaNO。和NH。HSO。NH4NO。和NaHSO。8．（）Mg（2）HCI（3）CO。（4）Cu（0）2（5）Cllo（6）CllC12物质的性质与变化（－）1．D2．B3C4．B5．A6．A、D7RRDoR］OC11C‘D17A13A、C（二）1．（l）硬度小… 相似文献
11.
LI Jun TIAN Rui XIAO Xue-shan School of Materials Science Engineering Shanghai University Shanghai P.R.China 《上海大学学报(英文版)》2007,(5)
The hot hardness behavior of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) bulk metallic glass is studied from ambient temperature to the temperature over T_x (the onset crystallization temperature) using a hot macro-hardness tester and scanning electron microscopy (SEM).The results show that the hot hardness behavior of Zr_(52.5)Al_(10)Ni_(10)Cu_(15)Be_(12.5) bulk metallic glass can be classified into 4 zones:the glassy zone in which the hardness almost linearly decreases with the increase of temperature,the viscoelastic zone in which the hardness is nearly unchanged,the viscous flow zone in which the hardness quickly tends towards near zero with temperature,and the crystallization zone in which the hardness sharply increases.The high temperature deformation behavior and the easy processable deformation region for bulk metallic glasses are also discussed on the basis of the hot marco-hardness. 相似文献
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1IntroductionSince a non-noble bulk metallic glassy alloy was dis-covered byInoue ,et al.[1]in 1988 , many stable amor-phous alloy systems with higher glass-forming abilityand lower critical cooling rates have been developed .Among them, Zr-based metallic glassy alloys are in-tenselyinvestigated because of their wider supercooledliquid region and other favorable thermodynamic andmechanical properties .In general ,surface morphologyof amorphous alloy parts is veryi mportant forindustri-al and … 相似文献
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Zr65Al10Ni10Cu15, Zr52.5Al10Ni10Cu15Be12.5 and Zr52.5Al10Ni14.6 Cu17.9Ti5bulk amorphous alloys were prepared by copper mould casting. The crystallization kinetics was measured by differential scanning calorimeter(DSC) with different heating rates, and the activation energy was calculated using Kissinger equation. The relationship between thermal stability and rate constant of crystallization reaction is discussed on the view of crystallization kinetics, and the effect of small atom Beryllium on thermal stability of bulk amorphous alloys is also studied. 相似文献
14.
采用射频溅射法在单晶硅基片上沉积了(FE88ZR7B5)0.97CU0.03软磁薄膜样品,对制备态样品进行了直流电流退火处理。结果表明,最佳退火电流为800 MA,在13 MHZ频率下,最大纵向巨磁阻抗比从制备态的8%上升到最佳退火态的17%,明显提高了巨磁阻抗效应和磁场响应灵敏度。详细分析和讨论了样品的巨磁阻抗效应随退火电流变化的特性和机理。 相似文献
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Zr65 Al10 Ni10 Cu15, Zr52.5 Al10 Ni10 Cu15 Be12.5 and Zr52.5 Al10 Ni14.6 Cu17.9 Ti5 bulk amorphous alloys were prepared by copper mould casting. The crystallization kinetics was measured by differential scanning calorimeter(DSC) with different heating rates, and the activation energy was calculated using Kissinger equation. The relationship between thermal stability and rate constant of crystallization reaction is discussed on the view of crystallization kinetics, and the effect of small atom Beryllium on thermal stability of bulk amorphous alloys is also studied. 相似文献
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1IntroductionNickel-based alloys containing 20 -30 wt % Mo isknown to be essential for corrosion resistance in re-ducing media[1],especially for resistance to HCl at alltemperatures and concentrations[2]. However , uponexposure to elevated temperatures in the range of600 -800 ℃,these alloys suffer an al most completeloss of roomtemperature ductility as a result of long-range ordering (LRO) to Ni4Mo .It is considered thatthe loss of ductility mainly results from the environ-mental embrittle… 相似文献
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采用可见光谱（ＶＩＳ）及酶活性测定等方法,研究铜锌超氧化歧化酶 （Ｃｕ_２Ｚｎ_２ＳＯＤ）与精氨酸钴（Ⅱ）（Ｃｏ（Ａｒｇ）ｎ）的直接相互作用以及外加精氨酸钻（Ⅱ）的量、溶液ｐＨ值对此类相互作用的影响．结果发现：在水溶液中原酶活性中心处的Ｚｎ（Ⅱ）离子可被外加的精氨酸钻（Ⅱ）部分诱导、交换出来,而溶液中外加的 Ｃｏ（Ａｒｇ）ｎ中的 Ｃｏ（ Ⅱ）进入酶的活性中心,形成“Ｃｏ－ＳＯＤ”酶衍生物,并相应影响了酶的催化活性．与此同时,外加精氨酸钴（Ⅱ）的量、溶液ｐＨ值对此类相互作用进行有重要的影响． 相似文献