A STUDY OF PRECIPITATION IN INTERSTITIAL ALLOYS. I. PRECIPITATION SEQUENCE IN Ta-C ALLOYS

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A systematic transmission electron microscopy study of carbide precipitation in quenched-aged tantalum-carbon alloys has clarified the mechanism of precipitation in refractory BCC metal-carbon alloys. Diffraction contrast analysis shows that the precipitate platelets lie on {l_brace}310{r_brace} planes of the matrix, are interstitial in nature, and fully coherent before they thicken further and lose coherency. The precipitation sequence is continuous and involves no renucleation during the formation of the non-coherent phase. Thus, the final orientation relationship of the precipitate with the matrix already is found at the earliest stage at which it is possible to detect it. The interpretation of the results ... continued below

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26 p.

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Dahmen, U.; Westmacott, K.H. & Thomas, G. August 1, 1980.

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A systematic transmission electron microscopy study of carbide precipitation in quenched-aged tantalum-carbon alloys has clarified the mechanism of precipitation in refractory BCC metal-carbon alloys. Diffraction contrast analysis shows that the precipitate platelets lie on {l_brace}310{r_brace} planes of the matrix, are interstitial in nature, and fully coherent before they thicken further and lose coherency. The precipitation sequence is continuous and involves no renucleation during the formation of the non-coherent phase. Thus, the final orientation relationship of the precipitate with the matrix already is found at the earliest stage at which it is possible to detect it. The interpretation of the results indicates that, as in FCC alloys, vacancies play an important role in the precipitation process during the nucleation and early growth stages and permit the formation of the hexagonal equilibrium M{sub 2}C structure early in the sequence. The model proposed to explain the observations is also consistent with the multistage hardening observed in quenched-aged refractory metal interstitial alloys.

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26 p.

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  • Journal Name: Acta Metallurgica

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  • Report No.: LBL-11244
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 993842
  • Archival Resource Key: ark:/67531/metadc1015311

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  • August 1, 1980

Added to The UNT Digital Library

  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 17, 2017, 6:59 p.m.

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Dahmen, U.; Westmacott, K.H. & Thomas, G. A STUDY OF PRECIPITATION IN INTERSTITIAL ALLOYS. I. PRECIPITATION SEQUENCE IN Ta-C ALLOYS, article, August 1, 1980; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1015311/: accessed January 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.