749 Result(s)
within
Xu** Song
Characterization and Evaluation of Materials
Surfaces and Interfaces, Thin Films
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Article
A model for the design of gas-solid reactors
An approximate equation enabling the prediction of the extent of reaction of a porous particle with a gas has recently been published. The equation, which is sufficiently accurate for engineering purposes, is ...
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Article
The kinetics of nickel oxide reduction by hydrogen; measurements in a fluidized bed and in a gravimetric apparatus
The suitability of a batch fluidized bed laboratory reactor for measuring the rates of gas-solid reactions was investigated. Experiments were carried out on the reduction of Falconbridge nickel oxide by hydrog...
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Article
The free energies of mixing of melts in the systems 2FeO-SiO2-2MnO-SiO2 and 2.33FeO-TiO2-2.33MnOTiO2
The free energies of mixing in melts in the system 2FeO · SiO2-2MnO · SiO2 at 1450°C and the system 2.33FeO · TiO2-2.33MnO · TiO2 at 1475°C have been obtained from measurement of the equilibrium Mn + FeO = Fe + M...
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Article
The driving force for chemically induced migration of molten ni films between w grains
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Article
Interparticle spacings and undercoolings in Al-Si eutectic microstructures
Modified methods for the measurement of interparticle spacing and undercooling of the Al-Si eutectic have been applied in an attempt to test the applicability to this system of the accepted equation for diffus...
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Article
The effect of varying AI, Ti,and Nb content on the phase stability of INCONEL 718
The effects of varying the strengthening alloying elements on the microstructural stability of the superalloy INCONEL 718 have been investigated using scanning electron microscopy, transmission electron micros...
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Article
The growth of tubular or vermicular structures in organic monotectic systems
Growth fronts have been examined for several transparent organic monotectic alloys based on succinnonitrile (SCN), using a temperature gradient stage. The systems include SCN with water, glycerol, benzene, and...
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Article
Nonlinear oscillations and chaotic behavior due to impact lonization of shallow donors in InSb
Both nonlinear oscillations and chaotic behavior in n-InSb are experimentally investigated for the case of impact ionization of shallow donors at low temperatures. Complex behavior including a simple periodic ...
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Article
Shear band formation in heavily cold rolled 70-30 brass
Blocks of 70 μm grain size 70-30 brass have been cold rolled up to a strain of 2.4. Polished parallelepiped samples have been prepared from the cold rolled strips and deformed in plane strain in a well-lubrica...
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Article
Solidification in the system Al-Ge-Si: The phase diagram, coring patterns, eutectic growth, and modification
In the ternary system Al-Ge-Si, the binary eutectic reactions, L (liquid) ⇔ (Al) + (Si) and L ⇔ (Al) + (Ge) are connected by a monovariant valley, L ⇔ (Al) + (SiGe), falling from 578 °C at 12.7 wt pct Si to 42...
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Article
Shock-induced chemical reactions and synthesis of nickel aluminides
Chemical reactions in Ni and Al powder mixtures, initiated by the passage of shock waves, are used for the synthesis of nickel aluminides. Mechanistic investigations reveal that the extent of these shock-induc...
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Article
Matrix Penetration of W/W Grain Boundaries and Its Effect on Mechanical Properties of 93W-5.6Ni-1.4Fe Heavy Alloy
The matrix phase of 93W-5.6Ni-l.4Fe heavy alloy has penetrated into W/W grain boundaries during a newly developed heat treatment which consists of repeated isothermal holdings at 1150 °C and water quenching be...
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Article
Effect of magnetic field on the microstructure and macrosegregation in directionally solidified Pb-Sn alloys
An investigation into the influence of a transverse magnetic field (0.45 T) on the mushy zone morphology and macrosegregation in directionally solidified hypoeutectic Pb-Sn alloy shows that the field has no in...
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Article
The liquid film migration in a sintered Fe-Cr-C base alloy
In an Fe-5Cr-lMo-2Cu-0.5P-3C (wt pct) alloy prepared by liquid-phase sintering at 1120 °C, the intergranular liquid films migrate during cooling and isothermal heat treatment at temperatures where the solid an...
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Article
Effects of self-accommodation and plastic accommodation in martensitic transformations and morphology of martensites
The effects of self-accommodation and plastic accommodation in martensitic transformations and the displacement vector for lattice deformation are discussed. The authors propose that the formation of an invari...
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Article
Influence of temperature and strain rate on slip and twinning behavior of zr
The stress-strain behavior of pure Zr was studied systematically at various temperatures and strain rates. At 76 K, Zr deforms predominantly by twinning, whereas above room temperature (RT), slip is the contro...
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Article
Stacking faults in sic particles and their effect on the fracture behavior of a 15 Vol Pct SiC/6061-AI matrix composite
Mechanical tests and microstructural examinations performed on a SiC-particle-reinforced 6061-A1 matrix composite indicate that particle cracking during mechanical testing significantly affects the failure mec...
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Article
Variation of contact angles with temperature and time in the Al-Al2O3 system
The contact angles of liquid Al on polycrystalline Al2O3 determined by the conventional sessile drop method were obtuse (∼120 deg) up to 900 °C but decreased rapidly at 1000 °C. When the molten Al was squeezed th...
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Article
Time dependence of tip morphology during cellular/dendritic arrayed growth
Succinonitrile-1.9 wt pct acetone has been directionally solidified in 0.7 X 0.7-cm-square cross section pyrex ampoules in order to observe the cell/dendrite tip morphologies, not influenced by the “wall effec...
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Article
Convection during thermally unstable solidification of Pb-Sn in a magnetic field
Convection and macrosegregation in directionally solidified hypoeutectic Pb-38 wt pct Sn and hypereutectic Pb-64.5 wt pct Sn have been examined during upward and downward growth. Temperature fluctuations are o...
