Metal elasticity index

A bright white metal soft and ductile body-centered cubic structure index of refraction 3.03 density 5.96 g/cm melts at 1,910°C vaporizes at 3,407°C electrical resistivity, 18.1 microhm-cm at 0°C and 20.1 microhm-cm at 25°C magnetic susceptibility 1.4x10 cgs units modulus of elasticity 18-19x10 psi shear modulus 6.73xl0 psi Poisson s ratio 0.36 thermal neutron absorption cross section 5 barns/atom insoluble in water, dilute sulfuric acid, and hydrochloric acid at all concentrations soluble in nitric acid, aqua regia, and concentrated sulfuric acid insoluble in alkalies. 

Aqueous soap solutions can be obtained in three distinct forms, the sol form containing the ionic micelle, a clear gel, and a white opaque solid the curd. The sol and gel forms of various soaps have been examined by McBain and his co-workers and shown to differ only in elasticity and rigidity, whilst the electrical conductivity, refractive index, concentration of metallic ion and lowering of the vapour pressure are all identical, results to be anticipated on the fibrillar theory. The gel as we have seen is fibrillar in nature and the conversion of a gel into a curd is brought about by the removal of soap fi om solutions in the form of relatively coarse fibres, a process similar to crystallisation. The experiments of Laing and McBain... 

Tantalum is a gray, very hard, malleable, and ductile metal, with an atomic mass of 180.95 and atomic number 73 (Merck Index Online 2002). The boiling point of 5429°C and a melting point of 2996 °C are exceeded only by those of rhenium and tungsten (Hammond 1986, Merck Index Online 2002). Numerous forms of tantalum exist, including pentachloride, pentafluoride, and pent-oxide salts, which are insoluble in water. The most stable oxidation state is + 5. Tantalum is almost twice as dense as iron (density 16.6 gcm ) and about 90% as stiff, with a modulus of elasticity value, E = 2.7x10 psi (Taylor 1969, Merck Index Online 2002). 

Introduction.—The possibility of allotropy in vanadium metal at sub-ambient temperatures has been investigated by measuring the electrical resistivity in the [110] direction of a single crystal, the elastic constants, and by. Y-ray diffraction studies. The results were consistent with no allotropy. The information available on vanadium chemistry has been indexed and the organometallic chemistry of this element reported during 1971 has been reviewed. Dicyclopentadienylpentacarbonyldivanadium has been shown... 

Shark-skin occttrs when the melt index and the coefficient n are small. This may happen when a larger amount of plasticizer is used Die swell is caused by elastic deformation in flow. It resrrlts from material expansion after it leaves the die. Increase in shear rate increases die swell. Parison sagging is caused by a decrease in pseudoplastic properties (coefficient n becoming closer to unity) and decreased friction between metal and melt. 

This ratio shows competition between plastic and brittle deformation modes. Notably, this index shows no dependence on the elastic deformation mode (dependence on Young s modulus see Section 8.4). B values calculated for different glasses and one metal are shown in Table 8.2. 

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