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Alloy System (alloy + system)
Selected AbstractsChemInform Abstract: A Study of the Al-rich Region of the Al,Ni,Mo Alloy System.CHEMINFORM, Issue 16 2002B. Grushko Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] A Comparative Study of the Al,Co,Pd and Al,Co,Ni Alloy Systems.CHEMINFORM, Issue 24 2004M. Yurechko No abstract is available for this article. [source] Microstructure and Mechanical Properties of New AlCoxCrFeMo0.5Ni High-Entropy AlloysADVANCED ENGINEERING MATERIALS, Issue 1-2 2010Chin-You Hsu Effects of Co content on microstructures and hot hardness of a new high-entropy alloy system, AlCoxCrFeMo0.5Ni (x,=,0.5 to 2.0) were investigated. As cobalt content increases, the microstructure changes from dendrite to polygrain type and the constituent phases change from BCC,+,, at x,=,0.5 to BCC,+,FCC,+,, at x,=,2.0. The alloy hardness varies from Hv 788 at x,=,0.5 to Hv 596 at x,=,2.0. This can be explained with the relative amount of hard , phase, medium hard BCC phase and soft FCC phase. All the AlCoxCrFeMo0.5Ni alloys possess higher hardness level than that of Ni-based superalloys In 718/In 718 H from room temperature to 1273,K. They obey the Westbrook equation presenting the normal heating behavior. Both alloys of x,=,0.5 and 1.0 exhibit a transition temperature higher than that of Co-based alloy T-800 by about 200,K. They also have a high hot hardness of Hv 347 at 1273,K, which is higher than those of In 718 and In718 H by Hv 220. The strengthening mechanism for their superiority is proposed. The AlCoxCrFeMo0.5Ni alloy system has great potential in high-temperature applications. [source] Solid-State NMR Characterization of the Multiphase Structure of Polypropylene In-reactor AlloyMACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 10 2010Haijin Zhu Abstract A variety of solid-state NMR techniques were used to characterize the chain dynamics, miscibility and the micro-phase structure of a polypropylene (PP) in-reactor alloy system. The alloy was physically separated into three fractions, and the molecular dynamics and relaxation behavior of the pure fractions was then compared with the components in the alloy to achieve comprehensive understanding of the phase structure of the PP in-reactor alloy. The miscibility among different components of the alloy was studied by the rotational frame spin-lattice relaxation time. Proton spin-diffusion methods were used to quantify the domain thicknesses of different regions in the alloy. The results show that the alloy is composed of three phases, namely, a homo-polyethylene (HPE) matrix, a homo-polypropylene (HPP) dispersed phase, and a linear low-density polyethylene (LLDPE) interphase. The thickness of the LLDPE interphase is estimated to be 7.7,nm at room temperature, and changes dramatically with temperature. Finally, based on all the solid-state NMR results, a model for the micro-phase-structure of the PP in-reactor alloy is proposed, and a correlation between the micro-phase structure and the excellent mechanical property is established. [source] Polycrystalline sputtered Cd(Zn, Mn)Te films for top cells in PV tandem structuresPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 4 2004Sung Hyun Lee Abstract The CdTe-ZnTe or CdTe,MnTe alloy system is evaluated for application in high efficiency polycrystalline thin film multijunction solar cells. CdZnTe alloy films with 1.6 and 1.7 eV band gap and CdMnTe with 1.6 and 1.8 eV were deposited by RF magnetron sputtering from targets made of mixed powders of CdTe and ZnTe (25% and 40%) or MnTe (13% and 25%), respectively. Without postdeposition treatment, however, both of these alloy films exhibit quite low photovoltaic performance when used to make cells with CdS as the heterojunction partner. Therefore, we have searched for an appropriate postdeposition treatment to improve the efficiency of these alloy films. As-grown films have been postdeposition treated with vapors of chlorine-containing materials such as HCl gas, CdCl2, ZnCl2 or MnCl2 in dry air or H2+Ar atmosphere. When the CdCl2 + ZnCl2 or MnCl2 vapor was used, the ratio of CdCl2 to ZnCl2 or MnCl2 was adjusted to match the stoichiometry of alloy films. The temperature of the treatment was chosen to represent conditions employed for those alloy films/CdS structures. As a result, the postdeposition treated CdZnTe and CdMnTe cell efficiency can be improved by a factor of over 100. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] A New Way to Improve Glass-Forming Ability by Controlling the Preparation Conditions of Bulk Metallic GlassADVANCED ENGINEERING MATERIALS, Issue 3 2010Jie Mao Abstract The effects of mold preheating temperature on the glass-forming ability of Zr64.9Al7.9Ni10.7Cu16.5 and Zr47Cu37.5Ag7.5Al8 alloys are investigated using traditional copper mold casting. It is found that there exists an optimum mold temperature for glass-forming alloy systems. For the two Zr-based alloy systems studied the optimum mold temperature is 353,K. This is explained from the perspectives of heat transfer efficiency and the wettability between liquid alloy and copper mold. [source] Identification of Quaternary Shape Memory Alloys with Near-Zero Thermal Hysteresis and Unprecedented Functional StabilityADVANCED FUNCTIONAL MATERIALS, Issue 12 2010Robert Zarnetta Abstract Improving the functional stability of shape memory alloys (SMAs), which undergo a reversible martensitic transformation, is critical for their applications and remains a central research theme driving advances in shape memory technology. By using a thin-film composition-spread technique and high-throughput characterization methods, the lattice parameters of quaternary Ti,Ni,Cu,Pd SMAs and the thermal hysteresis are tailored. Novel alloys with near-zero thermal hysteresis, as predicted by the geometric non-linear theory of martensite, are identified. The thin-film results are successfully transferred to bulk materials and near-zero thermal hysteresis is observed for the phase transformation in bulk alloys using the temperature-dependent alternating current potential drop method. A universal behavior of hysteresis versus the middle eigenvalue of the transformation stretch matrix is observed for different alloy systems. Furthermore, significantly improved functional stability, investigated by thermal cycling using differential scanning calorimetry, is found for the quaternary bulk alloy Ti50.2Ni34.4Cu12.3Pd3.1. [source] Studies on the rheological properties and compatibility of low molecular weightPC and PS polymer alloy,POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 3-5 2003Jun Liu Abstract The rheological properties and compatibility of PC/PS containing SMA are determined and the possibility of the alloy being used as a new disc material is also discussed in this paper. The results showed that the ,a of the alloy decreased markedly on increasing the temperature, shear rate and PS content in the alloy. In addition, it was confirmed by DSC that PC was partly compatible with PS. The influence of SMA added into PC/PS on the compatibility was also studied. The results showed that SMA has compatibilization, apparent viscosity ,a of the systems could be lowered by the addition of the compatibilizer, and the results of DSC showed that the Tg of the PC phase got closer to the Tg of the PS phase, until it has only one Tg. Using SEM, the microstructure of the polymer alloy was studied. It indicated compatibilization was better, consistent with the result of DSC. Finally, it is discussed whether the PC/PS alloy systems with the compatibilizer could be used as the substrate material for optical disks. Copyright © 2003 John Wiley & Sons, Ltd. [source] Growth, structure and thermal properties of CuAlxGa1-xSe2 alloysCRYSTAL RESEARCH AND TECHNOLOGY, Issue 10 2006J. Castro Abstract Ingots of the CuAlxGa1-xSe2 (0 , x , 1) alloys system were prepared by direct fusion of the stoichiometric mixture of the elements. The analysis of X-ray Powder Diffraction data showed the presence of one single phase with chalcopyrite tetragonal structure at room temperature for all the studied compositions. The lattice parameters, a and c, and the bond lengths were calculated. The phase transition temperatures were obtained by the onset method from Differential Thermal Analysis measurements performed on samples sealed in evacuated quartz ampoules. Fusion or transition enthalpies were determined from the area of the corresponding DTA peak. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] | |||||||||||||