Yazan, Khaddam (2021) How Plastic Deformation Effects the Precipitation Hardening Process in Al-Cu Alloys. UNSPECIFIED thesis, UNSPECIFIED.
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Yazan Khaddam-M.Sc. in Mechanical Engineering-Thesis-2021.pdf - Accepted Version Restricted to Repository staff only Download (4MB) |
Abstract
This thesis deals with the concept of equal channel angular pressing (ECAP), as a severe plastic deformation (SPD) of metal alloy, and some types of heat treatments applied to a heat treatable wrought Al-Cu-Mg alloy (Al2026). The aim of this thesis is: study the effect of the technological ways to the strength and microstructure of Al2026. The effects on the degree of formability on the microstructure, hardness and on the process of artificial aging was investigated. The different deformation rate was simulated by ECAP process, where we applied 1 to 4 passes, and measured the effect of work hardening by Brinell Hardness method and microstructure analyses. The grains became more and more elongated with increasing the number of ECAP steps. After annealed the deform structures the grains got back their nearly rounded shape, but their sizes became smaller and smaller with increasing degree of formability. I also analyzed the deformation rate effects on the artificial aging by using different aging temperatures. The aim was to find the optimal aging process for getting the maximum strength. For this I investigated, how effected the hardness values by using natural aging before artificial aging, and how effected if not. For artificial aging I tried 2 different temperatures, like 160°C and 180°C with 2 soaking times – 6 and 10 hours / each. The highest strength was reached by using 4 passes ECAP on each temperature/time combinations, which means, that by increasing the work hardening effect the strength increases also. In case of the natural aging process implementation to the technology before artificial aging is a good idea, because in both temperatures/times combinations where I used this step, resulted higher strength than without natural aging. In summary, I can say that 180°C/ 6h artificial aging process after 7 days natural aging resulted the highest strength on the 4passed ECAP samples. 160°C/ 10 h sample has a bit lower strength under the same circumstances. 180°C /10 h sample a bit overaged and 160°C /6h sample a bit under aged. After we finished the whole processes and compared the findings, we select which technological route is the best to reach the maximum strength. Furthermore, when we know the hardness of the samples deformed by different technological routes, we can calculate the indicator which shows the complexity of all measurements.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Uncontrolled Keywords: | precipitation hardening, Al-Cu alloy, homogenization, equal channel angular pressing (ECAP), solid solution heat treatment, aging |
| Divisions: | Műszaki Intézet |
| Depositing User: | Gergely Beregi |
| Date Deposited: | 24 May 2022 07:49 |
| Last Modified: | 24 May 2022 07:49 |
| URI: | http://szakdolgozat.repo.uniduna.hu/id/eprint/308 |
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