نتایج جستجو برای: amorphous alloy

تعداد نتایج: 76796  

Journal: :Langmuir : the ACS journal of surfaces and colloids 2005
D M Rampulla C M Mancinelli I F Brunell A J Gellman

The origins of the tribological properties and corrosion resistance of amorphous and quasicrystalline approximant alloys have been studied by comparing their properties in thin Al-Cu-Fe alloy films with compositions lying near the quasicrystalline region of the ternary compositional phase diagram. Six sputtered thin films of an Al-Cu-Fe alloy were studied using X-ray diffraction, X-ray photoemi...

Journal: :Biomedical materials 2008
Yufeng Zheng Dong Liu Xiliang Liu Li Li

Ti-TiC-TiC/diamond-like carbon (DLC) gradient nano-composite films have been prepared on NiTi alloy substrates by the technique of plasma immersion ion implantation and deposition (PIIID) combined with plasma-enhanced chemical vapor deposition (PECVD). The influence of negative bias voltage applied to the substrate (from -100 V to -500 V) on the chemical structure, microstructure, mechanical pr...

Journal: :Nano letters 2015
Dongwoo Lee Gi-dong Sim Kejie Zhao Joost J Vlassak

Reactive nanolaminates afford a promising route for the low-temperature synthesis of zirconium diboride, an ultrahigh-temperature ceramic with metallic properties. Although the addition of carbon is known to facilitate sintering of ZrB2, its effect on the kinetics of the formation reaction has not been elucidated. We have employed a combined approach of nanocalorimetry and first-principles theo...

2006
Xi Wang Joost J. Vlassak

The temperature dependence of the crystallite nucleation and growth rates is measured for amorphous NiTi thin films. Using transmission electron microscopy, crystallites are shown to nucleate homogeneously in the film and to grow in a channeling mode. A mechanism that suppresses heterogeneous nucleation is proposed. By manipulating nucleation and growth rates, grains as large as 60 lm can be ob...

2012
A. I. Figueroa F. Bartolomé J. Bartolomé A. Rogalev

We present x-ray absorption near edge structure (XANES) and x-ray magnetic circular dichroism (XMCD) measurements performed at the Co K and W L2,3 edges, on amorphous Co-W alloy nanoparticles, and a comparison with those on a bulk Co3W alloy. A strong hybridization between the 4p and 3d orbitals in Co and the 5d band in W are observed, resulting in an induced magnetic moment in the W atoms. The...

1998
Tahir Çağın Jianwei Che Yue Qi Yanhua Zhou Ersan Demiralp Guanghua Gao William A. Goddard

In order to illustrate how atomistic modeling is being used to determine the structure, physical, and chemical properties of materials at the nanoscale, we present here the results of molecular dynamics (MD) simulations on nanoscale assemblies of such materials as carbon nanotubes, diamond surfaces, metal alloy nanowires, and ceramics. We also include here the results of nonequilibrium MD simul...

2002
M. L. Lee Y. Li

Influence of different microstructure of La-based fully amorphous samples and its composites on the impact fracture energy were investigated and discussed. Results showed improvement in fracture energy of glassy metals with the presence intermetallic phases, but deteriorated in the presence of dendrite phases and high volume % of crystalline phases.

2016
R. Guimaraes P. Viccaro W. Schreiner M. Vasconcellos M. Baibich M. N. Baibich

We have seen, by Mossbauer spectroscopy, magnetization and resistivity, changes on the physical properties of the aFe20Ni6oB20 alloy induced by thermal relaxation, notedly increases in T, and resistivity. These changes can be explained by modifications of the chemical short range order around Fe favouring the formation of Fe-Ni pairs.

2006
S. Penner B. Jenewein H. Gabasch B. Klötzer D. Wang A. Knop-Gericke R. Schlögl K. Hayek

Despite many recent attempts to unravel the structure of novel PdZn alloys, promising catalysts in methanol steam reforming, a detailed study on the formation of Pd-Zn alloy particles and of their structural and thermal stability is still missing. We take advantage of the unique properties of epitaxially grown Pd particles embedded in layers of amorphous ZnO and mechanically stabilized by SiO2,...

Journal: :Journal of the American Chemical Society 2015
Wei Tang Yanpeng Liu Chengxin Peng Mary Y Hu Xuchu Deng Ming Lin Jian Zhi Hu Kian Ping Loh

Lithium alloys of group IV elements such as silicon and germanium are attractive candidates for use as anodes in high-energy-density lithium-ion batteries. However, the poor capacity retention arising from volume swing during lithium cycling restricts their widespread application. Herein, we report high reversible capacity and superior rate capability from core-shell structure consisting of ger...

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