Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy
The present research was conducted on thin-walled castings with 5 mm wall thicknesses. This study addresses the effect of the influence of different master alloys, namely: (1) Al-5%Ti-1%B, (2) Al-5%Ti and (3) Al-3%B, respectively on the structure and the degree of undercooling (ΔTα = Tα−Tmin, where...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2016-09-01
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| Series: | Archives of Foundry Engineering |
| Subjects: | |
| Online Access: | http://www.degruyter.com/view/j/afe.2016.16.issue-3/afe-2016-0045/afe-2016-0045.xml?format=INT |
| _version_ | 1797714841359613952 |
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| author | Górny M. Sikora G. Kawalec M. |
| author_facet | Górny M. Sikora G. Kawalec M. |
| author_sort | Górny M. |
| collection | DOAJ |
| description | The present research was conducted on thin-walled castings with 5 mm wall thicknesses. This study addresses the effect of the influence of different master alloys, namely: (1) Al-5%Ti-1%B, (2) Al-5%Ti and (3) Al-3%B, respectively on the structure and the degree of undercooling (ΔTα = Tα−Tmin, where Tα - the equilibrium solidification temperature, Tmin - the minimum temperature at the beginning of α(Al) solidification) of an Al-Cu alloy. The process of fading has been investigated at different times spent on the refinement treatment ie. from 3, 20, 45 and 90 minutes respectively, from the dissolution of master alloys. A thermal analysis was performed (using a type-S thermocouple) to determine cooling curves. The degree of undercooling and recalescence were determined from cooling and solidification curves, whereas macrostructure characteristics were conducted based on a metallographic examination. The fading effect of the refinement of the primary structure is accompanied by a significant change in the number (dimension) of primary grains, which is strongly correlated to solidification parameters, determined by thermal analysis. In addition to that, the analysis of grain refinement stability has been shown with relation to different grain refinements and initial titanium concentration in Al-Cu base alloy. Finally, it has been shown that the refinement process of the primary structure is unstable and requires strict metallurgical control. |
| first_indexed | 2024-03-12T07:57:57Z |
| format | Article |
| id | doaj.art-8d92bdc528484039823bbe08a1442737 |
| institution | Directory Open Access Journal |
| issn | 2299-2944 |
| language | English |
| last_indexed | 2024-03-12T07:57:57Z |
| publishDate | 2016-09-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Foundry Engineering |
| spelling | doaj.art-8d92bdc528484039823bbe08a14427372023-09-02T20:04:45ZengPolish Academy of SciencesArchives of Foundry Engineering2299-29442016-09-01163353810.1515/afe-2016-0045afe-2016-0045Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu AlloyGórny M.0Sikora G.1Kawalec M.2AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland.AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland.AGH University of Science and Technology, Faculty of Foundry Engineering, Department of Engineering of Cast Alloys and Composites, Reymonta 23, 30–059 Krakow, Poland.The present research was conducted on thin-walled castings with 5 mm wall thicknesses. This study addresses the effect of the influence of different master alloys, namely: (1) Al-5%Ti-1%B, (2) Al-5%Ti and (3) Al-3%B, respectively on the structure and the degree of undercooling (ΔTα = Tα−Tmin, where Tα - the equilibrium solidification temperature, Tmin - the minimum temperature at the beginning of α(Al) solidification) of an Al-Cu alloy. The process of fading has been investigated at different times spent on the refinement treatment ie. from 3, 20, 45 and 90 minutes respectively, from the dissolution of master alloys. A thermal analysis was performed (using a type-S thermocouple) to determine cooling curves. The degree of undercooling and recalescence were determined from cooling and solidification curves, whereas macrostructure characteristics were conducted based on a metallographic examination. The fading effect of the refinement of the primary structure is accompanied by a significant change in the number (dimension) of primary grains, which is strongly correlated to solidification parameters, determined by thermal analysis. In addition to that, the analysis of grain refinement stability has been shown with relation to different grain refinements and initial titanium concentration in Al-Cu base alloy. Finally, it has been shown that the refinement process of the primary structure is unstable and requires strict metallurgical control.http://www.degruyter.com/view/j/afe.2016.16.issue-3/afe-2016-0045/afe-2016-0045.xml?format=INTQuality managementMetallographyAl-5Cu alloyFading effectPrimary grains of α(Al) |
| spellingShingle | Górny M. Sikora G. Kawalec M. Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy Archives of Foundry Engineering Quality management Metallography Al-5Cu alloy Fading effect Primary grains of α(Al) |
| title | Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy |
| title_full | Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy |
| title_fullStr | Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy |
| title_full_unstemmed | Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy |
| title_short | Effect of Titanium and Boron on the Stability of Grain Refinement of Al-Cu Alloy |
| title_sort | effect of titanium and boron on the stability of grain refinement of al cu alloy |
| topic | Quality management Metallography Al-5Cu alloy Fading effect Primary grains of α(Al) |
| url | http://www.degruyter.com/view/j/afe.2016.16.issue-3/afe-2016-0045/afe-2016-0045.xml?format=INT |
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