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The Nanocrystalline Alloys: The Structure and Properties

  • N. I. Noskova
Part of the NATO ASI Series book series (ASHT, volume 50)

Abstract

We were interested in studying the strength and, plasticity, the structure of nanograins and their boudaries for nanocrystalline polyphases alloys. We have investigated nanocrystalline, Fe73.5Nb3Cu1Si13.5B9, Fe73Ni0.5Nb3Cu1Si13.5B9, Fe5Co70Si15B10, Pd77.5Cu6Si16.5 and Pd81Cu7Si12 ribbons produced by superfast quenching from the melt followed by fast heating to 723–923 K, in vacuum. The annealing time was from 10 s to 1 h. The alloy Pd81Cu7Si12 was produced by rapid quenching of melt and crystallized during creep tests in the temperature’s range between 623 and 823 K and the stresses between 0.7 and 39 MPa. Under creep at 723 K at stress of 2.1 MPa, the resulting alloy had a nanocrystalline structure with a grain size of <10 nm. Under these conditions the alloy exhibited an elevated plasticity. Also reported are the results of dynamic experiments on the compaction with temperature of nanocrystalline TiN and A12O3 powder in die ranging 573–873 K. Phase composition and the microstructure of alloys were studied using the transmission electron microscopy method. The microstructure of the nanocrystalline Fe73.5Nb3Cu1Si13.5B9 alloy was studied in situ at different stages of crystallization of the amorphous ribbons in the column of an electron microscopy. High-resolution transmission electron mocroscopy (HRTEM) was used to study the structure of nanophase crystals and their interfaces in nanophase alloys. It was shown that the interfaces between chemically similar nanophases may have different structure. The tensile strength of the alloys was determined by stretching ribbon specimens to failure at a rate of 1.6×10-3 -7×10-5 s-1 at 293–723 K.

Keywords

Metallic Glass Amorphous Alloy Creep Test Coercive Force Creep Condition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • N. I. Noskova
    • 1
  1. 1.Ural Division of Russian Academy of SciencesInstitute of Metal PhysicsEkaterinburgRussia

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