Glassy Metals III: Amorphization Techniques, Catalysis, by H. Beck, H. J. Guntherodt

By H. Beck, H. J. Guntherodt

The current quantity summarizes a number of the very important contemporary advancements within the box of metal glasses. a number of new "amorphization" tools equivalent to hydrogen absorption, thermal interdiffusion reactions, irradiation and mechanical alloying are offered and numerous thermodynamic and experimental elements of those recommendations are mentioned intimately. A bankruptcy is dedicated to glassy metals used as catalyst precursors yielding steel catalysts with strange chemical and structural homes. The interrelation among digital and ionic constructions in glassy and liquid metals provides interesting insights within the easy houses of the non-crystalline country of subject.

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Additional resources for Glassy Metals III: Amorphization Techniques, Catalysis, Electronic and Ionic Structure

Example text

Upon heating, the amorphous phase forms along the interface(s) separating the individual metal layers. As mentioned above, the amorphous phase frequently appears as a uniform planar interlayer suggesting that the initial nucleation of the amorphous phase at points along the interface is quickly followed by rapid spreading along the interface. In this, the common case, growth of the amorphous phase along the interface seems much more rapid than in the direction normal to the interface. 4 gives a summary of binary metal/metal systems in which SSAR has been reported in thin-film diffusion couples.

102 Simple metal/transition metal systems AI-Mo AI-Mn AI-Pt Sn-Co Ni-Mg B M M M M activation energy for self diffusion of matrix atoms. F o r m o s t A D F systems, the solute a t o m has an atomic radius which is at least 10% smaller than the atomic radius of the host atom. It is currently accepted that the fast diffusing solute tends to o c c u p y interstitial sites in the host matrix. The small activation energy is then associated with the existence of easily accessible excited configurations of the interstitial atom.

Further, the dominant diffusing species of a binary pair of metals is inwtriably that which exhibits ADF behavior as discussed above. The non moving species is that which serves as the non moving host metal in ADF. Naturally, ADF involves diffusion in the crystalline state, whereas the growth of an amorphous interlayer during SSAR inw)lvcs diffusion within the growing amorphous phase. The relationship between ADF and SSAR will be laken up again later. Associated with the existence of a dominant moving species in SSAR is the formation of Kirkendall voids along the interface of the ditTusion couple.

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