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TZM Alloy Organization Structure

After observing TZM alloy SEM image found there uniformly distributed white spherical particles and the shape of the block material. Analysis element content found that the white spherical particles main element is Ti and matrix elements mainly is Mo, Zr and a small amount of Ti, from this we can see that small amount of Ti and Zr form Mo-Ti and Mo-Zr solid solution in TZM alloy with Mo. Bedsides, the solid solution ability of Zr is better than Ti. And this is because the solid solution of TZM alloy is mainly through Mo matrix to dissolve a small amount of Zr, Ti, C and other element making Mo lattice contorted. The size of the solute and solvent atoms greater the difference, the better the reinforcing effect, on one hand, the size difference factor of Zr and Mo is + 14.3. On the other hand, Ti and Mo size difference factor is + 4.4. So the solid solution ability of Zr is better than Ti. Although C and Mo size difference factor is -34.5 which is very large, but due to the C content is low in TZM alloy and most of C will work with Mo, Ti and Zr react generate carbide, at the same time C will be consumed when occurs reduction reaction. Therefore TZM alloy strengthen mainly Mo-Ti and Mo-Zr solid solution strengthening, as well as TiC and ZrC dispersion strengthened which was generated by Zr, Ti, and C. These organization structures not only improve the mechanical properties of the alloy also increases the alloy recrystallization temperature.

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