For the Co-free MlNi4.0Al0.3Si0.1Fe0.6 alloys, prepared by conventional casting (as-cast) and melt-spinning with different cooling rates(5,10,15,20m/s), the phase structure and electrochemical properties of these alloys were comparatively studied.
The differential scanning calorimeter (DSC ) analysis indicats that the melting point temperature and separating out temperature of eutectic are 345 ℃ and 328.7 ℃ respectively at heating and cooling rates of 15 K/min and 10 K/min.
Comparing with eutectoid steel,the microstructure of F+P+B was observed when the cooling rates down to 2.5 ℃/s,while the microstructure of F+B was obtained when the cooling rates ranging from 2.5 ℃/s to 25 ℃/s.
The Gibbs free energy differences between the supercooled liquid and the crystal for Co_(43)Fe_(18)Ta_(5.5)Sn_2B_(30)Si_(1.5) bulk amorphous alloys with different diameters and the amorphous ribbon indicate the increase in solidification cooling rates leads to the easiness of glass forming and a decrease in free energy, which is close to that of the crystal.
By using radial distribution function (RDF) and pair analysis (PA) methods, the structure and glass forming ability of this alloy is studied by quenching from the liquid at different cooling rates (1×1011, 1×1012, 5×1012, 1×1013 and 1×1014 K/s).
In order to examine the effects of water contents and heating/cooling rates on the glass transition and the structure relaxation parameters of glycerol/water mixtures, five aqueous solutions (60%, 70%, 80%, 90% and 100%) were investigated using the differential scanning calorimetry.
A parameterized radiation and cloud model developed by the University of Utah U S A has been used to compute the atmospheric radiative properties in Zhangye area in January,April,August and October,1991 during HEIFE period For cloudless atmosphere,the effects of atmospheric condition,surface albedo and emissivity on the solar radiation budget,solar heating and IR cooling rates of the earth-atmosphere system are discussed;
It is shown that the relative differences of up and down radiative fluxes and the absolute differences of atmospheric cooling rates between them in the longwave region are less than 3.1% and 0.13 K·d -1 for the whole atmosphere, respectively. These differences are within the scope from ICRCCM (Intercomparison of Radiation Codes Used in Climate Models).
Analysis shows that the result of this paper reflected the solar heating and infrared cooling rates correctly in summer in east part of China, and the relation between the changing factors and local solar heating and infrared cooling.