共查询到16条相似文献,搜索用时 15 毫秒
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采用直流磁控溅射法制备了Co1-xPtx合金薄膜,并详细研究了其结构和磁学性能随x变化的规律.通过XRD结构分析可知溅射态的薄膜当x≤28%时,为hcp结构;x=35%和40%时,为hcp和fcc的混合结构;x≥46%以后,为fcc结构.VSM测试结果表明随x的增大,溅射态薄膜的矫顽力先增大后减小,当x=23%时,矫顽力达到最大值2147×79.6
A/m,在x=46%处矫顽力急剧下降至100×79.6 A/m左右,x>46%以后,矫顽力随x的增大不再明显变化.退火后,hcp结构的薄膜矫顽力基本不变,而接近等原子比的fcc结构的CoPt薄膜,由于部分转变为fct结构,矫顽力有很大提高;fcc结构的CoPt3薄膜矫顽力有所增大,但是增大不多. 相似文献
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1IntroductionTernaryintermetaliccompoundscontainingrareearthmetalshavevariouscrystalstructuresandmanifestseveralinterestin... 相似文献
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采用直流磁控溅射法制备了Co1_(-x)Pt_x合金薄膜,并详细研究了其结构和磁学性能随x变化的规律。通过XRD结构分析可知:溅射态的薄膜当x≤28%时,为hcp结构;x=35%和40%时,为hcp和fcc的混合结构;x≥46%以后,为fcc结构。VSM测试结果表明:随x的增大,溅射态薄膜的矫顽力先增大后减小,当x=23%时,矫顽力达到最大值2147×79.6A/m,在x=46%处矫顽力急剧下降至100×79.6A/m左右,x>46%以后,矫顽力随x的增大不再明显变化。退火后,hcp结构的薄膜矫顽力基本不变,而接近等原子比的fcc结构的CoPt薄膜,由于部分转变为fct结构,矫顽力有很大提高;fcc结构的CoPt3薄膜矫顽力有所增大,但是增大不多。 相似文献
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O. Palumbo A. Paolone R. Cantelli C. Giannini A. Gagliardi P. Reale B. Scrosati S. Lo Russo A. Maddalena P. Palade G. Principi G. Schinteie 《Journal of Alloys and Compounds》2008,463(1-2):148-152
The effects of heating-induced crystallization on the structural and mechanical properties of Mg–Ni–Fe amorphous ribbons were studied by anelastic spectroscopy, differential scanning calorimetry (DSC) and X-ray diffraction. DSC results show that the crystallization occurs through several non-reversible steps, which correspond to significant changes in the Young's modulus and concomitant irreversible elastic energy loss peaks. Moreover, an anelastic peak is found at 215 K, which for the first time indicates the presence of some dynamical process related to the simultaneous presence of different phases. The formation of a metastable Mg6Ni phase is detected, which transforms into Mg and Mg2Ni stable phases. A quantitative analysis of the different phases present at the different steps was also carried out. 相似文献
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用X射线衍射(XRD)、中子衍射(NRD)和Rietveld全谱拟合方法分析和研究PuNi3型La0.67Mg0.33Ni2.5Co0.5合金及其充氘后的氘化物晶体结构。结果表明,退火合金La0.67Mg0.33Ni2.5Co0.5由主相(La,Mg)Ni3相(PuNi3-type)和少量LaMgNi4相(MgCu4Sn-type)及La2Ni7相(Ce2Ni7-type)组成;Co元素在(La,Mg)Ni3相中主要分布在AB5单元中6c和AB5/AB2单元共格处的18h位置上;合金充满氘后形成了La0.67Mg0.33Ni2.5Co0.5D4.0,D原子在(La,Mg)Ni3相中主要占据RM5单元中的36i2、18h5、6c4及RM2单元内的6c1、18h3和18h1位置上,其中RM5单元中的氘含量为6.5(1)D/f.u.,而RM2单元中吸纳的氘量为3.2(2)D/f.u.。充氘后La0.67Mg0.33Ni2.5Co0.5D4.0晶胞整体基本呈各向同性膨胀(δa/a=7.1%,δc/c=9.1%),但在RM2单元中其各向异性膨胀较大(δc/c=15.8%,δV/VRM2=32.8%),而在RM5单元中各... 相似文献
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由于操作者的失误,导致一批车厢底板纵梁总成的装配没有按照图纸进行,并且发现时已经焊接完毕,这批纵梁总成作为大型结构部件面临着报废的风险.分析车厢纵梁总成焊接结构、相关联尺寸,找出装配错误的纵梁总成存在的问题,认为此批纵梁总成能够通过补强进行补救而避免报废,通过补救方案修复的纵梁在运行一年多的时间后没有出现过开裂问题,证明补救方案是可行的,同时节省了一定的成本. 相似文献
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Abstract High-resolution solid-state nuclear magnetic resonance is an analytical tool complementary to X-ray crystallography and it provides useful structural information for studying molecular structures. As well as being a general review, this article treats topics of current interest, especially the application of carbon-13 cross-polarization magic-angle spinning (CP/MAS) techniques to a wide range of chemical substances. There are also sections on hydrogen-bonded structures and on NMR studies of nuclei other than carbon, such as hydrogen. aluminum, silicon, phosphorus and tin. 相似文献
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介绍了台湾引进的模具结构及工作过程,以及改进后的模具结构及工作过程,解决了制件在原来模具加工下产生的缺陷,制件质量完全符合顾客要求。 相似文献
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飞机蒙皮搭接结构的腐蚀问题直接危害飞机的使用寿命和结构强度,制约飞行安全。由于腐蚀发生位置隐蔽性高,常规无损检测的检测效果不理想。利用有限元分析方法,使用AN-SYS软件模拟检测环境,通过建立飞机蒙皮搭接结构模型,计算模型表面温度场分布。重点从腐蚀面积、腐蚀深度、表面划伤等问题对红外检测技术的可行性进行了分析,为其对蒙皮搭接结构检测的应用提供了理论依据。 相似文献
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将Co66Fe4Mo2Si16B12非品合金在460℃等温退火30~120min。合金在460℃等温退火过程中,相对起始磁导率μi随退火时间的延长先增大,在t≈45min时达到最大值,然后随着退火时间的延长快速下降。电子衍射花样的结果表明,合金此时仍保持非品态结构.同时发现,合金的饱和磁致伸缩系数λs随退火时间的延长由负值逐渐变为正值,当t=45min时,λs≈0,由此可知,合金在等温退火过程中相对起始磁导率的峰值与零磁致伸缩系数相对应。 相似文献
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Guoyan Huo Guanghui Rao Zhiyu Qiao Jingkui Liang Weihua Tang Baogen Shen 《Journal of Alloys and Compounds》1998,270(1-2)
Single-phase compounds Gd3(Fe1−xTix)29 (x=0.0110.034) have been synthesized. Gd3(Fe1−xTix)29 crystallises in a monoclinic lattice with space group P21/c, and the crystal structure is refined by the Rietveld technique based on X-ray powder diffraction data. Thermomagnetic analysis indicates that the Curie temperature of the compounds ranges from 517 K to 538 K. The saturation magnetizations of the Gd3(Fe1−xTix)29 (x=0.011, 0.022, 0.034) at 1.5 K are 103.6, 102.0 and 94.3 Am2/kg, and the anisotropy fields at 1.5 K are 6.0, 6.2 and 6.4T, respectively. 相似文献