Characterisation of the influence of minor elements on microstructure variations in a secondary cast aluminium piston alloy
Characterisation of the influence of minor elements on microstructure variations in a secondary cast aluminium piston alloy
The influence of minor elements (Sr, Sb, Mn, Cr and Al-5Ti-B) on the microstructure and porosity in a secondary piston Al-Si alloy was investigated using SEM-EDX and micro-focus computed tomography (CT) tools. Porosity and intermetallic characteristics were measured in the 3D CT volumes as well as on 2D SEM images. The intermetallics occurring were identified using EDX and by cross-referencing with previous work. The volume fraction (Vf) of intermetallics increased with minor element additions except when 0.2%Sb was added. Sb decreased Vf but increased beta-Al5FeSi particles in the alloy. This effect was cancelled with addition of 0.2%Sb+0.53%Mn. Porosity increased with all additions except for 1%Cr, which resulted in fine compact intermetallics and reduced porosity. Addition of 0.53%Mn and 0.3%Mn+0.2%Cr also resulted in compact phases and low porosity. Porosity was highest in the Sr-modified alloys with 0.02%Sr giving higher porosity than 0.05%Sr. However, porosity reduced in the 0.02%Sr alloy with 0.53%Mn addition while addition of 0.53%Mn+0.05%Sr significantly increased the level of porosity and intermetallics
1279-1284
Mbuya, Thomas O.
45e6ba08-0535-48e2-b960-3e473fd87d61
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Mose, Bruno R.
1ea7da58-e9b8-41a2-b304-c34e67ac8dbf
Maranga, Stephen M.
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Reed, Philippa A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
5 September 2010
Mbuya, Thomas O.
45e6ba08-0535-48e2-b960-3e473fd87d61
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Mose, Bruno R.
1ea7da58-e9b8-41a2-b304-c34e67ac8dbf
Maranga, Stephen M.
b5f5a173-56b1-4e35-9e9d-60c33a0203f4
Reed, Philippa A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Mbuya, Thomas O., Sinclair, Ian, Mose, Bruno R., Maranga, Stephen M. and Reed, Philippa A.S.
(2010)
Characterisation of the influence of minor elements on microstructure variations in a secondary cast aluminium piston alloy.
12th International Conference on Aluminium Alloys (ICAA12), Yokohama, Japan.
05 - 09 Sep 2010.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
The influence of minor elements (Sr, Sb, Mn, Cr and Al-5Ti-B) on the microstructure and porosity in a secondary piston Al-Si alloy was investigated using SEM-EDX and micro-focus computed tomography (CT) tools. Porosity and intermetallic characteristics were measured in the 3D CT volumes as well as on 2D SEM images. The intermetallics occurring were identified using EDX and by cross-referencing with previous work. The volume fraction (Vf) of intermetallics increased with minor element additions except when 0.2%Sb was added. Sb decreased Vf but increased beta-Al5FeSi particles in the alloy. This effect was cancelled with addition of 0.2%Sb+0.53%Mn. Porosity increased with all additions except for 1%Cr, which resulted in fine compact intermetallics and reduced porosity. Addition of 0.53%Mn and 0.3%Mn+0.2%Cr also resulted in compact phases and low porosity. Porosity was highest in the Sr-modified alloys with 0.02%Sr giving higher porosity than 0.05%Sr. However, porosity reduced in the 0.02%Sr alloy with 0.53%Mn addition while addition of 0.53%Mn+0.05%Sr significantly increased the level of porosity and intermetallics
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Published date: 5 September 2010
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12th International Conference on Aluminium Alloys (ICAA12), Yokohama, Japan, 2010-09-05 - 2010-09-09
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Local EPrints ID: 188195
URI: http://eprints.soton.ac.uk/id/eprint/188195
PURE UUID: 8b2c6a89-2a07-4039-a35b-9f604fde13d0
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Date deposited: 24 May 2011 08:03
Last modified: 15 Mar 2024 02:45
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Author:
Thomas O. Mbuya
Author:
Bruno R. Mose
Author:
Stephen M. Maranga
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