Aluminum and Zinc oxide powder were blended by friction stir processing (FSP) with threaded pin of 6mm in diameter under conditions of traverse speed, 1mm/sec and rotation speed, 1500rpm. Different thermal analysis (DTA) was conducted to reveal that the melting point of the stir zone decreased to 592oC from 660oC of the green compact specimen containing 20wt%ZnO. X-ray diffraction (XRD) identified that Zn from ZnO dissolved into Al matrix, and did not resolve redox products, alomina. Scanning electron microscopy (SEM) with filed emission gun was employed with EDS analysis. It is interesting to note that many redoxed products with oxygen concentration higher than that of the matrix can be seen as dark and gray phases in BSE images.
Evidently, a chemical reaction in Al/ZnO system is possible during FSP and results of the reduced Zn dissolving into the Al matrix and the expected but not detectable nanoscale alumina uniformly being dispersed into the matrix can be attributed to the excellent 22% elongation, and 350 MPa tensile strength in the stir zone from stirred Al-25wt% ZnO.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0830107-021340 |
| Date | 30 August 2007 |
| Creators | Sung, Chien-te |
| Contributors | Po-We Kao, New-Jin Ho, Liuwen Chang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0830107-021340 |
| Rights | not_available, Copyright information available at source archive |
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