Oxidation of Intermetallics by Edited by: Michael Schutze, Hans Jurgen Grabke, Hans Jürgen

By Edited by: Michael Schutze, Hans Jurgen Grabke, Hans Jürgen Grabke, Michael Sch?tze

During the last ten years titanic efforts have been made within the examine and improvement of intermetallic compounds to realize stronger hot temperature energy and occasional temperature ductility. those new structural fabrics are utilized in a number of high-temperature purposes like engines and generators. Oxidation and corrosion resistance are as vital for the present functions of those fabrics as mechanical properties.

This e-book provides a legitimate evaluate of the current wisdom of the oxidation kinetics and mechanisms of intermetallics. specially Ti-, Ni- and Fe-aluminides are taken care of intimately by way of specialists from Europe, united states and Japan. the knowledge supplied could be of wealth for any engineer and scientist- fabrics scientist, physicist or chemist - interested in the advance of latest intermetallic fabrics and their purposes.

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Oxidation a continuous y-Al,O, had formed between the internal oxidation zone (IOZ) and the y’ single crystal. Oxidation for 30 min. resulted in a microstructure similar to the 6min. oxidation but the Ni in the two-phase zone was oxidized to NiO. The spinel was presumed to have formed by a solid state reaction between NiO and y-Al,O,. A crystallographic orientation relationship was found between the a and y alumina whereby (OOOl)[lTOO], I1 (11I)[lTO],. i. e. close packed planes and close packed directions of c1 arc parallel to close packed planes and directions in y.

And the others were two-phase Cllb+C40. Theoxidation kinetics for MoSi, and the Al-;ra-, and --containing alloys were parabolic with MoSi, and MoSi,+-Ta having the slowest rates and MoSi,+Al having a rate constant more than a factor of ten larger. The MoSi,+Ti had rates similar to MoSi, at temperatures below the eutectic temperature in the'I'i0,SiO, system (1550'C) and rates similar to MoSiz+Al above this temperature. The alloys containing Y and Zr exhibited non-parabolic kinetics and oxidation rates which were much greater than for the other alloys.

The early work by Choirdhirry et al. [50] indicated that Nb and W additions promoted the formation of continuous alumina on y at 950°C independent of surface preparation or exposure environment (air or 0,)while Hf had a minimal effect and Y and Ga were detrimental. Unpublished activity data are quoted as indicating that Nb and W additions increase the a,,/a, ratio and promote alumina stability. Unfortunately, comparison of much of the more recent work is difficult because experiments have been performed at different temperatures and in different atmospheres and various surface finishes (which are sometimes not clearly specified) have been used.

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