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SOLID STATE PROPERTIES AND LEACHING OF MECHANICALLY ACTIVATED TETRAHEDRITE

BAL■ P , ACHIMOVI■OV M , SEPLAK VInstitute of Geotechnics of Slovak Academy of Sciences , Kosice , SlovakiaBASTLZJ.Heyrovsky Institute of Physical Chemistry , Academy of Sciences of the Czech Republic , Prague , C. R. LIPAKJSlovak Technical University , Electrotechnical Faculty , Bratislava , Slovakia Manuscript received 22 February , 1994

金属学报(英文版)

The mechanical activation of tetrahedrite Cu_(12)Sb_(4)S_(13) was carried out in a planetary mill. The changes in the surface and bulk properties produced in mineral by mechanical activation were detected by infrared, photoelectron and Mossbauer spectroscopy. The rate and selectivity of tetrahedrite acid leaching depends on conditions of mechanical activation.

关键词: mechanical activation , null , null

Structural Dependence of Creep/Fatigue Behaviour of Single Crystal Ni-base Superalloy

J. Zrnik and M.Hazlinger(Faculty of Metallurgy , Technical University , Kosice , Slovakia)M.Zitnansky(Material- Technological Faculty , Trnava , STU Bratislava , Slovakia)Zhongguang WANG(State Key Labratory for Faigue and Fracture of Materials , Institute of Meta

材料科学技术（英文）

The effect of different initial microstructures deftned by γ' precipitate morphology has been investigated at the creep/fatigue conditions of 900℃ and 500 MPa. The wave form of stress as a function of time for cyclic load was of trapezoidal shape with a hold time of 10s at the upper stress level. The TEM was employed to examine the deformation process in strengthened γ' matrix in dependence of γ' precipitate morphology. The fracture lifetime and cycle number up to fracture were the criteria to evaluate the additional cyclic component efFect on the course of deformation

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