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The milling of tin bronze with a Cu-24.6wt%Sn composition
Includes bibliographies.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Centre for Materials Engineering
2014
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| _version_ | 1867613299435110400 |
|---|---|
| access_status_str | Open Access |
| author | Williams, Garth |
| author2 | Lang, Candy |
| author_browse | Lang, Candy Williams, Garth |
| author_facet | Lang, Candy Williams, Garth |
| author_sort | Williams, Garth |
| collection | Thesis |
| description | Includes bibliographies. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/8280 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:55.830Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Centre for Materials Engineering |
| publisherStr | Centre for Materials Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/8280 The milling of tin bronze with a Cu-24.6wt%Sn composition Williams, Garth Lang, Candy Materials Engineering Includes bibliographies. The effects of high energy milling on tin bronze with the composition Cu-24.6wtSn have been examined using hardness testing, optical microscopy, scanning electron microscopy, transmission electron microscopy and x-ray diffraction. High energy milling has caused mechanical alloying of an elemental copper and tin powder blend, and mechanical milling of a cast powder and a melt quenched powder. Nanocrystalline grains with a size between 5 nm and 50 nm have been directly observed in the final milled powder. The powder consist of the a phase and 8 phase and is partially amorphous. An extension of the solid solution solubility has also been detected due to milling. The formation of the metastable tin-rich 11 phase has been observed in the intermediate stage of mechanical alloying of the elemental powder blend due to the higher diffusivity of tin in copper over copper in tin. The formation of the 11 phase during mechanical alloying of tin bronze with the composition Cu-24.6wtSn has not been reported before. The morphological development of the three initial powders has proceeded by different mechanisms during milling due to the different hardness and toughness of the starting powders. Milling of the elemental powder blend and the cast powder proceeds via classic mechanisms for milling of ductile powders and brittle powders respectively, while milling of the tougher melt quenched powder proceeds via a combination of the two mechanisms. An attempt to process the milled powder into a bulk state using various thermomechanical techniques while still retaining a nanocrystalline grain size has not succeeded. The high diffusivity of the material at elevated temperatures has led to grain growth into the micrometer range even at relatively low thermo-mechanical processing temperatures. The milled powders have poor compaction properties due to the highly deformed structure and therefore the processed material has poor properties compared to a cast material. 2014-10-11T11:34:25Z 2014-10-11T11:34:25Z 1997 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/8280 eng application/pdf Centre for Materials Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Materials Engineering Williams, Garth The milling of tin bronze with a Cu-24.6wt%Sn composition |
| thesis_degree_str | Doctoral |
| title | The milling of tin bronze with a Cu-24.6wt%Sn composition |
| title_full | The milling of tin bronze with a Cu-24.6wt%Sn composition |
| title_fullStr | The milling of tin bronze with a Cu-24.6wt%Sn composition |
| title_full_unstemmed | The milling of tin bronze with a Cu-24.6wt%Sn composition |
| title_short | The milling of tin bronze with a Cu-24.6wt%Sn composition |
| title_sort | milling of tin bronze with a cu 24 6wt sn composition |
| topic | Materials Engineering |
| url | http://hdl.handle.net/11427/8280 |
| work_keys_str_mv | AT williamsgarth themillingoftinbronzewithacu246wtsncomposition AT williamsgarth millingoftinbronzewithacu246wtsncomposition |