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A Grain Boundary Engineering Approach to Materials Reliability

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Abstract

Intergranular degradation processes, (e.g., corrosion, stress corrosion, cracking, creep cracking) are a frequent cause of premature and unpredictable service failure of engineering components. Recent advances in (1) understanding structure-property relationships for grain boundaries, and (2) characterization techniques for grain boundaries in polycrystalline materials, have provided the means for improved component lifetime prediction, and the opportunity to engineer intergranular-degradation resistant microstructures.

In this work, we present our previously developed geometric models for grain boundary structure and grain size effects on intergranular degradation susceptibility. Specific examples are presented of the successful application of the s'grain boundary engineerings' approach to the prediction and mitigation of intergranular corrosion, stress corrosion cracking, and creep cracking in Ni-based materials.

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Acknowledgements

The authors would like to thank A.M. Brennenstuhl, F. Gonzalez, D. Limoges, A. Robertson and F. Smith for their contributions to this work. Financial support from Ontario Hydro Technologies and the Natural Sciences and Engineering Research Council of Canada is gratefully acknowledged.

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Authors and Affiliations

  1. Materials Technology Department, Ontario Hydro Technologies, 800 Kipling Avenue, KR270, Toronto, Canada, M8Z 5S4, USA

    G. Palumbo, E. M. Lehockey, P. Lin & U. Erb

  2. Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Canada, M5S 1A4, USA

    P. Lin & K. T. Aust

  3. Dept. of Materials and Metallurgical Engineering, Queen's University, Kingston, Canada, K7L, 3N6, USA

    U. Erb

Authors
  1. G. Palumbo
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  2. E. M. Lehockey
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  3. P. Lin
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  4. U. Erb
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  5. K. T. Aust
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Palumbo, G., Lehockey, E.M., Lin, P. et al. A Grain Boundary Engineering Approach to Materials Reliability. MRS Online Proceedings Library 458, 273–282 (1996). https://doi.org/10.1557/PROC-458-273

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  • DOI: https://doi.org/10.1557/PROC-458-273

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