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Sci Rep. 2018 Jan 18;8(1):1090. doi: 10.1038/s41598-018-19337-7.

High strength nanostructured Al-based alloys through optimized processing of rapidly quenched amorphous precursors.

Author information

1
Advanced Functional Materials R&D Group, Korea Institute of Industrial Technology, Incheon, 21999, Korea.
2
Advanced Analysis Center, Korea Institute of Science and Technology, Seoul, 02792, Korea.
3
Deparment of Advanced Materials Engineering, Yonsei University, Seoul, 03722, Korea.
4
IFW Dresden, Institute for Metallic Materials, Helmholtzstraße 20, D-01069, Dresden, Germany.
5
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069, Dresden, Germany.
6
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 10, A-8700, Leoben, Austria.
7
Norwegian University of Science and Technology, Teknologivegen 22, 2815, Gjøvik, Norway.
8
Department Materials Physics, Montanuniversität Leoben, Jahnstraße 10, A-8700, Leoben, Austria.
9
Advanced Functional Materials R&D Group, Korea Institute of Industrial Technology, Incheon, 21999, Korea. mhlee1@kitech.re.kr.

Abstract

We report the methods increasing both strength and ductility of aluminum alloys transformed from amorphous precursor. The mechanical properties of bulk samples produced by spark-plasma sintering (SPS) of amorphous Al-Ni-Co-Dy powders at temperatures above 673 K are significantly enhanced by in-situ crystallization of nano-scale intermetallic compounds during the SPS process. The spark plasma sintered Al84Ni7Co3Dy6 bulk specimens exhibit 1433 MPa compressive yield strength and 1773 MPa maximum strength together with 5.6% plastic strain, respectively. The addition of Dy enhances the thermal stability of primary fcc Al in the amorphous Al-TM -RE alloy. The precipitation of intermetallic phases by crystallization of the remaining amorphous matrix plays important role to restrict the growth of the fcc Al phase and contributes to the improvement of the mechanical properties. Such fully crystalline nano- or ultrafine-scale Al-Ni-Co-Dy systems are considered promising for industrial application because their superior mechanical properties in terms of a combination of very high room temperature strength combined with good ductility.

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