Thus it may be summarised that work hardening behaviour of the alloy superni 263 can not be analysed using the simple power law equation. The work hardening behaviour is satisfactorily analysed using the modified power law equation (Ludwigson equation). There is systematic variation in the different work hardening parameters K1, n1, K2, n2 and C with the period of ageing at 800 °C. The drastic lowering of the parameters n1 and eup, from ageing even for a short duration, suggests that this material should be formed in fully solution treated condition and any precipitation of γ′ must be avoided for good formability. 相似文献
Silicon - In this paper, a compact 2D analytical modelling of surface potential and simulation of Si-Ge hetero-junction Dual Material Gate Vertical t-shape T-FET is presented. In the proposed... 相似文献
Silicon - In this treatise, we have proposed a Single Material Gate–Dual Gate Impact Ionization Metal Oxide Semiconductor (SMG DG-IMOS) based Pressure Sensor. The pressure sensor has the most... 相似文献
Journal of Inorganic and Organometallic Polymers and Materials - Different concentrations of ZnFe2O4 and manganese substituted ZnFe2O4 nanoparticles (10%, 20% and 30%) dispersed... 相似文献
Metallurgical and Materials Transactions A - The design of high entropy alloys (HEAs) can be accelerated using machine learning (ML) algorithms. In the current study, the design parameter’s... 相似文献
The impact of micro-alloying on tensile behavior at strain rates in various ranges is examined using five types of extruded Mg-0.3 at. pct Mn–0.1 at. pct X ternary alloys, where X is selected as a common element, Al, Li, Sn, Y or Zn. Microstructural observations reveal that the average grain size of these extruded alloys is between 1 and 3 μm, and these micro-alloying elements segregate at grain boundaries. In room temperature tensile and compression tests, these results show that the mechanical properties and deformation behavior are influenced by the micro-alloying element, even as a small addition of 0.1 at. pct. Mg–Mn–Y and Mg–Mn-Zn alloys show higher strength and smaller strain rate sensitivity (m-value) among the present alloys, owing to the rate-controlling mechanism as dislocation slip. On the other hand, the Mg–Mn–Li alloy exhibits the largest elongation to failure in tension and the highest strain rate sensitivity, associated with high contribution of grain boundary sliding to deformation. These differences are due to the grain boundary segregation of the micro-alloying elements. Compared to the common Mg alloys, the present ternary alloys also show a trade-off relationship between strength and ductility, which is similar to that of the well-known Mg alloys; however, these properties of the Mg–Mn system ternary alloys could be controlled via the type of micro-alloying elements with a chemical content of 0.1 at. pct.
Two AlMnZn alloys in melt-spun condition have been studied by transmission electron microscopy. The Al24Mn5Zn alloy was found to be fully icosahedral, while the Al12Mn2.9Zn alloy gave rise to decagonal quasicrystal. The decagonal phase grew in clusters with an orientation relationship between the grains suggesting nucleation on an icosahedral seed. On annealing at 500–600°C, the quasicrystalline phase transformed to a body centered orthorhombic phase L (a = 1.24, b = 1.26 andc = 3.05nm) with a high density of planar defects. This phase transforms to an ordered and defect free monoclinic phase M, a superlattice structure of L (a = c = 1.77, b = 3.05nm and β = 89.1°). The L phase is shown to be a rational approximant of the icosahedral phase. The interrelationship among quasicrystalline phases and their rational approximants in AlMnZn system are highlighted. 相似文献
Fabrication of cost-effective, nano-grained net-shaped components has brought considerable interest to Department of Defense,
National Aeronautics and Space Administration, and Department of Energy. The objective of this paper is to demonstrate the
versatility of electron beam-physical vapor deposition (EB-PVD) technology in engineering new nanostructured materials with
controlled microstructure and microchemistry in the form of coatings and net-shaped components for many applications including
the space, turbine, optical, biomedical, and auto industries. Coatings are often applied on components to extent their performance
and life under severe environmental conditions including thermal, corrosion, wear, and oxidation. Performance and properties
of the coatings depend upon their composition, microstructure, and deposition condition. Simultaneous co-evaporation of multiple
ingots of different compositions in the high energy EB-PVD chamber has brought considerable interest in the architecture of
functional graded coatings, nano-laminated coatings, and design of new structural materials that could not be produced economically
by conventional methods. In addition, high evaporation and condensate rates allowed fabricating precision net-shaped components
with nanograined microstructure for various applications. Using EB-PVD, nano-grained rhenium (Re) coatings and net-shaped
components with tailored microstructure and properties were fabricated in the form of tubes, plates, and Re-coated spherical
graphite cores. This paper will also present the results of various metallic and ceramic coatings including chromium, titanium
carbide (TiC), titanium diboride (TiB2), hafnium nitride (HfN), titanium-boron-carbonitride (TiBCN), and partially yttria stabilized zirconia (YSZ) TBC coatings
deposited by EB-PVD for various applications.
This paper was presented at the International Symposium on Manufacturing, Properties, and Applications of Nanocrystalline
Materials sponsored by the ASM International Nanotechnology Task Force and TMS Powder Materials Committee, October 18–20,
2004, Columbus, OH. 相似文献
ABSTRACTNano-composite polymer gel electrolytes (NPGEs) based on polymer poly(vinylidene fluoride-co-hexafluoropropylene) PVdF-HFP, ionic liquid, 1-butyl-3- methylimidazolium bis(trifluoromethanesulfonyl)imide BMIMTFSI, Li-salt along with the addition of SiO2 nanoparticles have been synthesized and characterized by various techniques. Prepared NPGEs show high room temperature ionic conductivity (~10?3 S/cm) and have a wide electrochemical window (ECW) (~3.3–3.5 V). The galvanostatic charge/discharge profile was studied by sandwiching best performing NPGEs between a LiFePO4 cathode and lithium metal anode. The specific discharge capacity of the cell (Li/NPGE/LiFePO4) room temperature at 0.1C rate is found to be 138 mAh/g. 相似文献
Summary Over the past few years, the challenges of globalisation, consolidation and economical point of view have meant that manufacturers
of epoxy formulations have to constantly improve their capability to meet the needs of customers. An active area for advancement
is that of epoxy and polyamide resin with castor oil. Generally, people working in the coating industries are familiar with
castor oil, but this paper provides information on the new use of castor oil in epoxy and polyamide resin. This novel product
(castor oil-modified epoxy resin/castor oil-modified polyamide) provides a previously unattainable combination and improved
flexibility and toughness to a variety of ambient cure applications. This communication will review the performance of these
castor oil-modified epoxy and polyamide resin surface coatings and adhesives. Based on the results of this study, these systems
offer some advantages without much affecting the traditional properties of epoxy and polyamide resin in a variety of applications. 相似文献