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The age hardening characteristics of Nb-Base alloys containing carbon and/or silicon as interstitiels: Part II. (Nb-33 At. Pct Hf)

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Abstract

A study was made to investigate the solutioning and aging reactions and their effects on microstructure and microhardness in nine experimental Nb-base alloys involving Nb-33 Hf, Nb-33Hf-C, Nb-33Hf-Si, and Nb-33Hf-C-Si* systems. Alloys were solution treated, quenched, *Alloy compositions are in atomic percent. then aged for 2 h at temperatures ranging from 800 to 1600°C to examine the effect of temperature, and aged at 900 to 1100°C isothermally for times varying from 2 to 20 h. Microstructural changes were determined by optical and electron microscopy, the phases were chemically extracted and identified by X-ray diffraction, and hardness provided the means of evaluating structural effects.

The Nb-33Hf-Si and Nb-33Hf-C-Si alloys exhibited age hardening characteristics, which appear to be due to the precipitation of complex monocarbide (Nb, Hf) (C, O, N), while Nb-33HÍ-C alloys showed separation of Nb2C phase from (Nb, Hf) (C, O, N) on aging.

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Authors and Affiliations

  1. University of Cincinnati, 45433, Wright Patterson AFB, Dayton, OH

    N. C. Birla (Research Associate)

  2. Dept. of Materials Science and Metallurgical Engineering, University of Cincinnati, 45221, Cincinnati, OH

    M. Hoch (Professor of Materials Science)

Authors
  1. N. C. Birla
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  2. M. Hoch
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Birla, N.C., Hoch, M. The age hardening characteristics of Nb-Base alloys containing carbon and/or silicon as interstitiels: Part II. (Nb-33 At. Pct Hf). Metall Trans A 6, 1645 (1975). https://doi.org/10.1007/BF02641978

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  • DOI: https://doi.org/10.1007/BF02641978

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