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Effect of sintering temperature and heating mode on consolidation of Al–7Zn–2·5Mg–1Cu aluminum alloy

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Abstract

Densification behaviour, phase transformation, microstructural evolution and hardness values of microwave sintered Al–7Zn–2·5Mg–1Cu (7775) aluminum alloy were investigated and compared with conventionally sintered samples. Microwave sintering was performed in 2·45 GHz multimode microwave furnace at temperatures ranging from 570–630 °C. Microwave sintering at a heating rate of as high as 22°C/min resulted in ~55% reduction of processing time as compared to conventional sintering. A lower sintered density observed in the case of microwave processed samples was attributed to the inhomogeneity in microstructure and phase distribution. The X-ray diffraction results of conventionally sintered samples showed the presence of MgZn2, Mg2Zn11 and CuMgAl2, while only MgZn2 and CuMgAl2 phases were found in the case of microwave sintered samples and in lesser amount. Higher hardness and high standard deviation values were noticed for microwave sintered samples as compared to conventional counterparts.

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Acknowledgements

The authors would like to thank Mr Jessu Joys of AMPAL Inc., Palmerton, USA, for providing the 7775 aluminum alloy powders for the present study. This study was conducted under the Networked Centre for Microwave Processing of Metal-Ceramic Composites funded by the Indo-US Science and Technology Forum (IUSSTF), New Delhi, India.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, 208 016, India

    C PADMAVATHI & A UPADHYAYA

  2. Materials Research Institute, Pennsylvania State University, University Park, USA

    D AGRAWAL

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  1. C PADMAVATHI
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  2. A UPADHYAYA
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  3. D AGRAWAL
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Correspondence to C PADMAVATHI.

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PADMAVATHI, C., UPADHYAYA, A. & AGRAWAL, D. Effect of sintering temperature and heating mode on consolidation of Al–7Zn–2·5Mg–1Cu aluminum alloy. Bull Mater Sci 35, 823–832 (2012). https://doi.org/10.1007/s12034-012-0369-4

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  • DOI: https://doi.org/10.1007/s12034-012-0369-4

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