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Rajamuthamilselvan, M.
- Processing Map for Hot Working of 7075Al/20%SiC (5 μm) Particulate Reinforced Metal Matrix Composites
Abstract Views :177 |
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Authors
Affiliations
1 Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar-608002, Tamilnadu, IN
1 Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar-608002, Tamilnadu, IN
Source
Artificial Intelligent Systems and Machine Learning, Vol 3, No 9 (2011), Pagination: 573-578Abstract
The hot deformation behaviour of 7075Al/20%SiC (5μm) particulate reinforced metal matrix composites was studied by using processing map technique. The map has been interpreted in terms of the microstructural processes occurring in situ with deformation, based on the values of a dimensionless parameter (η) which is an efficiency index of energy dissipation through microstructural processes. An instability criterion has also been applied to demarcate the flow instability regions in the processing map using another parameter (ξ). Both the parameters (η and ξ) were computed from the experimental data generated by compression tests conducted at various temperature and strain rate combinations over the hot working range (300-500°C and 0.001-1 s-1) of the present material. The processing map exhibits two distinct η domains without any unstable flow conditions under the investigated temperature and strain rate conditions. The dominant microstructural mechanisms corresponding to these domains were identified to be extended dynamic recrystallization and flow localization. The 'stable' and 'unstable' regions in the processing maps were identified and compared with the reported microstructural observations of the deformed compression specimens. The optimum hot working conditions for these composites are suggested.Keywords
Metal-Matrix Composites (MMCs), Hot Deformation, Dynamic Recrystallization, Processing Map.
- A Study on GTAW of LM 25 Al/SiCp Metal Matrix Composites
Abstract Views :212 |
PDF Views:7
Authors
Affiliations
1 Department of Manufacturing Engineering, Annamaiai University, Annamaiai Nagar, IN
1 Department of Manufacturing Engineering, Annamaiai University, Annamaiai Nagar, IN
Source
Indian Welding Journal, Vol 39, No 4 (2006), Pagination: 15-19Abstract
Aluminum based MMCs have greater strength; good wear resistance and excellent elevated temperature properties. Alimnium based MMCs are being widely used in Automotive and Aerospace industries. In spite of the advantages of MMCs as described above they are not widely used due to lack of their applicability to tertiary process like welding. However, the presence of reinforcement causes difficulties in welding of these materials. Hence the present study is aimed at optimization of welding parameters for weld strength and examination of difficulties/defects during welding of these materials.