| 1. |
- Jaradeh, Majed, et al.
(författare)
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Analysis of solidification in a Bridgman furnace as a simulation of DC casting of aluminium alloy slabs
- 2007
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Ingår i: Materials Science and Technology. - 0267-0836 .- 1743-2847. ; 23:4, s. 475-482
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Tidskriftsartikel (refereegranskat)abstract
- The vertical Bridgman directional solidification equipment has been used in several investigations to simulate direct chill casting of wrought aluminium alloys. As a basis for such investigations and alloy developments, it is important to have an understanding of the performance of the furnace used during simulation of the casting conditions. In this investigation the thermal conditions in the furnace have been analysed in detail, both by measurements and by mathematical modelling. The growth characteristics of the furnace, such as gradient, growth rates and cooling rates have been compared to conditions in large ingots. The direct chill casting conditions, which the simulations have been compared to, are casting of slabs of 330 and 600 mm thickness of an aluminium AA3003 type alloy. The results show that the experiments are able to simulate the cooling conditions in the ingots except from the surface zone. Comparisons of the microstructures have been made and a good agreement has been obtained for structure parameters such as grain size and DAS.
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| 2. |
- Jaradeh, Majed, et al.
(författare)
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DTA and DSC Studies of Aluminium 3003 Alloys with Zn and Cu Additions
- 2007
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Ingår i: Metallurgical and Materials Transactions. A. - New York : Springer. - 1073-5623 .- 1543-1940. ; 38A, s. 2138-2147
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Tidskriftsartikel (refereegranskat)abstract
- The effect of Zn additions in the range of 0-5wt.% and Cu contents of 0.15-1.0 wt.%, on the solidification and precipitation behaviour of aluminium alloys of AA 3003 type was investigated with differential thermal analysis (DTA), differential scanning calorimetry (DSC), optical microscopy (OM), and scanning electron microscopy (SEM/EDX). The results show that the additions of varying Zn and Cu have significant effects on the crystallization process, phase precipitation and microstructure formation of the alloys. Phases formed have been identified and morphological differences have been discussed.
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| 3. |
- Jaradeh, Majed, et al.
(författare)
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Method Developed for Quantitative Assessment of Inclusions in Aluminium Billets
- 2007
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Ingår i: LIGHT METALS 2007. - : Minerals, Metals & Materials Society. - 9780873396592 ; , s. 679-684
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Konferensbidrag (refereegranskat)abstract
- A technique, based on sodium hydroxide hot macro etching, has been developed to deep etch non-metallic inclusions in a way that makes them visible on a macro scale. The distribution of inclusions in transverse sections along DC-cast aluminium billets could thus be studied. The technique has obvious advantages over other common analysis methods in giving a macroscopic spatial distribution of inclusions in a relatively simple way. The paper describes the development of the new technique and some applications. An analysis was made of how different inclusions behave during prolonged strong etching. Light optical microscopy, TEM and SEM/EDX have been used to identify specific inclusions.
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| 4. |
- Jaradeh, Majed, et al.
(författare)
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Solidification studies of 6xxx alloys with different Mg and Si contents
- 2005
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Ingår i: LIGHT METALS 2005. - : Minerals, Metals & Materials Society. - 0873395808 ; , s. 1039-1044
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Konferensbidrag (refereegranskat)abstract
- Directional solidification studies, simulating billet casting, have been made off alloys with balanced and not balanced Mg and Si additions, and with different alloying levels ranging from 6063 to 6082. The effects of growth rate, grain refinement, temperature gradient and composition on structure formation have been investigated. Increased alloy content strongly influence the solidification structure, but during cooling the coarsening process decrease the differences, and relatively similar structures are obtained at room temperature. Segregation to the surface zone is proposed to have an effect on surface defect formation.
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| 5. |
- Jaradeh, Majed, et al.
(författare)
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Solidification Studies of Automotive Heat Exchanger Materials
- 2006
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Ingår i: JOM. - : Springer Science and Business Media LLC. - 1047-4838 .- 1543-1851. ; 58:11, s. 56-61
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Tidskriftsartikel (refereegranskat)abstract
- Modifications of the aluminum alloy AA 3003 have been studied to improve and tailor its properties for applications in automotive heat exchangers. Laboratory techniques have been applied to simulate industrial direct-chill casting, and some basic solidification studies have been conducted. The results are coupled to structures observed in industrial-size ingots and discussed in terms of structure-property relations.
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