Transformation-superplasticity of metals and metal matrix composites
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2009
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| Online Access: | http://hdl.handle.net/1721.1/49665 |
| _version_ | 1826216726462726144 |
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| author | Zwigl, Peter, 1963- |
| author2 | David C. Dunand. |
| author_facet | David C. Dunand. Zwigl, Peter, 1963- |
| author_sort | Zwigl, Peter, 1963- |
| collection | MIT |
| description | Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998. |
| first_indexed | 2024-09-23T16:52:26Z |
| format | Thesis |
| id | mit-1721.1/49665 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:52:26Z |
| publishDate | 2009 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/496652020-08-25T14:45:43Z Transformation-superplasticity of metals and metal matrix composites Zwigl, Peter, 1963- David C. Dunand. Massachusetts Institute of Technology. Department of Materials Science and Engineering Materials Science and Engineering Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998. Includes bibliographical references (p. 156-162). The work covers transformation superplasticity of metals, alloys and metal matrix composites. Fundamental studies of transformation superplasticity in unreinforced metals, which either deform plastically or by creep, form the basis of further investigations in metal matrix composites. Experiments and analytical modeling are complemented by numerical analysis. The transformation superplastic behavior is related to microstructure and chemical composition. Based on an existing linear theory, a non-linear model is developed and applied to the experimental data. Numerical methods are used to model the stress-, strain and temperature evolution during the phase transformation. The results are in good agreement with the experiment and analytical predictions. First, transformation superplasticity of iron and iron-TiC composites is demonstrated with strains of 450% and 230% respectively. The reduction of the transformation superplasticity in the composites is attributed to the dissolution of TiC in iron and effect which is shown for iron-carbon alloys. Effects of transient primary creep, ratchetting and partial transformation through the ferrite-austenite phase field are examined. Second, transformation superplasticity of zirconium is demonstrated for the first time with a strain of 270% without fracture. Partial transformation resulting from high cycle frequencies is analyzed and related to material properties and cycle characteristics. Finally, nickel aluminide with unstabilized zirconia particulates shows significant higher strain rates upon thermal cycling as compared to the unreinforced matrix. Although, the fracture strain of 23% is below the superplastic limit, the composite shows a high strain rate sensitivity of m = 0.71, which is a necessary characteristic of transformation superplasticity. by Peter Zwigl. Ph.D. 2009-11-06T16:16:33Z 2009-11-06T16:16:33Z 1998 1998 Thesis http://hdl.handle.net/1721.1/49665 42078544 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 162 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Materials Science and Engineering Zwigl, Peter, 1963- Transformation-superplasticity of metals and metal matrix composites |
| title | Transformation-superplasticity of metals and metal matrix composites |
| title_full | Transformation-superplasticity of metals and metal matrix composites |
| title_fullStr | Transformation-superplasticity of metals and metal matrix composites |
| title_full_unstemmed | Transformation-superplasticity of metals and metal matrix composites |
| title_short | Transformation-superplasticity of metals and metal matrix composites |
| title_sort | transformation superplasticity of metals and metal matrix composites |
| topic | Materials Science and Engineering |
| url | http://hdl.handle.net/1721.1/49665 |
| work_keys_str_mv | AT zwiglpeter1963 transformationsuperplasticityofmetalsandmetalmatrixcomposites |