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Structure-Composition-Property Relationships In 5xxx Series Aluminum Alloys
| Title: | Structure-Composition-Property Relationships In 5xxx Series Aluminum Alloys |
| Author: | Unocic, Kinga Angelika |
| Description: | Al-Mg alloys are well suited for marine applications due to their low density, ease of fabrication, structural durability, and most notably resistance to corrosion. The purpose of this study is to investigate the effects of alloying additions, mechanical processing and heat treatments on the development of grain boundary phases that have an effect on intergranular corrosion resistance (IGC). Through modification of the standard AA5083 composition with extra additions of Cu and Zn and in conjunction with a long sensitization heat treatment (in excess of 1000 hrs at 165ºC) it is possible to form a corrosion resistance modified τ-phase along grain boundaries. From an economical standpoint it is too costly to heat treat an alloy for such a long period of time and therefore an alternative method of producing a corrosion resistant alloy has been explored. Cu, Zn, and Si modified compositions were produced and were subjected to a high degree of cold work and shorter sensitization times. Following ASTM G67 intergranular corrosion testing and a detailed microstructural characterization, an optimal composition and processing condition that yielded the best intergranular corrosion resistance was determined. The microstructural development that led to these findings and issues with TEM sample preparation will be discussed in detail. |
| Permanent Link: |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1218473077
http://hdl.handle.net/2374.OX/106149 |
| Date: | 2008 |
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