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Correlating microstructure and texture in cold-rolled Ta ingot

  • Tantalum
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Abstract

An analysis of tantalum ingot cold-rolled and annealed under different conditions reveals several correlations between the microstructure, developed textures and thermomechanical processing parameters. For example, the hardness of rolled sheet is not significantly affected by the amount of reduction prior to the final anneal, while the final grain size decreases with an increasing number of intermediate annealing steps. Four classes of texture are found in the cold-rolled tantalum, but the finer-grained classes can only be produced via a 70 percent reduction in thickness prior to the final anneal. Although ample dislocation debris is produced by the rolling operation, clearly defined line dislocations and dislocation networks are absent, indicating that full recrystallization is not achieved in the finished sheets. A large concentration of ledge dislocations at the grain boundary regions is considered an important contributor to the good formability of tantalum.

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Authors and Affiliations

  1. ARDEC Picatinny Arsenal, New Jersey

    C. Feng Ph.D. (metallurgist)

  2. Cabot Corporation, USA

    P. Kumar Ph.D. (senior scientist, member of TMS)

Authors
  1. C. Feng Ph.D.
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  2. P. Kumar Ph.D.
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Feng, C., Kumar, P. Correlating microstructure and texture in cold-rolled Ta ingot. JOM 41, 40–45 (1989). https://doi.org/10.1007/BF03220361

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