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Development of High-Strength High-Temperature Cast Al-Ni-Cr Alloys Through Evolution of a Novel Composite Eutectic Structure

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Abstract

Aiming to develop high-strength Al-based alloys with high material index (strength/density) for structural application, this article reports a new class of multiphase Al alloys in the Al-Ni-Cr system that possess impressive room temperature and elevated temperature (≥ 200 °C) mechanical properties. The ternary eutectic and near eutectic alloys display a complex microstructure containing intermetallic phases displaying hierarchically arranged plate and rod morphologies that exhibit extraordinary mechanical properties. The yield strengths achieved at room temperatures are in excess of 350 MPa with compressive plastic strains of more than 30 pct (without fracturing) for these alloys. The stability of the complex microstructure also leads to a yield stress of 191 ± 8 to 232 ± 5 MPa at 250 °C. It is argued that the alloys derive their high strength and impressive plasticity through synergic effects of refined nanoeutectics of two different morphologies forming a core shell type of architecture.

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Acknowledgments

The authors acknowledge the Department of Science and Technology, India, for providing the financial support, and the Advanced Facility for Microscopy and Microanalysis at IISc, Bangalore, for making available the microscopy facility.

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Authors and Affiliations

  1. Department of Materials Engineering, Indian Institute of Science, Bangalore, Karnataka, 560012, India

    P. Pandey, S. Kashyap, C. S. Tiwary & K. Chattopadhyay

  2. School of Engineering and Technology, BML Munjal University, 67th KM Stone NH-8, Gurgaon, 122413, India

    S. Kashyap

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  1. P. Pandey
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  2. S. Kashyap
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  4. K. Chattopadhyay
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Correspondence to C. S. Tiwary.

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Manuscript submitted May 3, 2017.

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Pandey, P., Kashyap, S., Tiwary, C.S. et al. Development of High-Strength High-Temperature Cast Al-Ni-Cr Alloys Through Evolution of a Novel Composite Eutectic Structure. Metall Mater Trans A 48, 5940–5950 (2017). https://doi.org/10.1007/s11661-017-4369-2

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  • DOI: https://doi.org/10.1007/s11661-017-4369-2

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