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Enhancing elevated temperature strength of copper containing aluminium alloys by forming L1(2) Al3Zr precipitates and nucleating theta '' precipitates on them

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Makineni,  Surendra Kumar
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Indian Institute of Science, Department of Materials Engineering, Bangalore, India;

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Citation

Makineni, S. K., Sugathan, S., Meher, S., Banerjee, R., Bhattacharya, S., Kumar, S., et al. (2017). Enhancing elevated temperature strength of copper containing aluminium alloys by forming L1(2) Al3Zr precipitates and nucleating theta '' precipitates on them. Scientific Reports, 7: 11154. doi:10.1038/s41598-017-11540-2.


Cite as: http://hdl.handle.net/21.11116/0000-0001-63AD-D
Abstract
Strengthening by precipitation of second phase is the guiding principle for the development of a host of high strength structural alloys, in particular, aluminium alloys for transportation sector. Higher efficiency and lower emission demands use of alloys at higher operating temperatures (200 degrees C-250 degrees C) and stresses, especially in applications for engine parts. Unfortunately, most of the precipitation hardened aluminium alloys that are currently available can withstand maximum temperatures ranging from 150-200 degrees C. This limit is set by the onset of the rapid coarsening of the precipitates and consequent loss of mechanical properties. In this communication, we present a new approach in designing an Albased alloy through solid state precipitation route that provides a synergistic coupling of two different types of precipitates that has enabled us to develop coarsening resistant high-temperature alloys that are stable in the temperature range of 250-300 degrees C with strength in excess of 260 MPa at 250 degrees C.