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

Song Yi Kim, Gwang Yeob Lee, Gyu Hyeon Park, Hyeon Ah Kim, A. Young Lee, Sergio Scudino, Konda Gokuldoss Prashanth, Do Hyang Kim, Jürgen Eckert, Min Ha Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
Article number1090
JournalScientific reports
Volume8
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1

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Crystallization
Compressive Strength
Temperature
Aluminum
Powders
Plastics
Hot Temperature
Growth
Ultrafine

All Science Journal Classification (ASJC) codes

  • General

Cite this

Kim, Song Yi ; Lee, Gwang Yeob ; Park, Gyu Hyeon ; Kim, Hyeon Ah ; Lee, A. Young ; Scudino, Sergio ; Prashanth, Konda Gokuldoss ; Kim, Do Hyang ; Eckert, Jürgen ; Lee, Min Ha. / High strength nanostructured Al-based alloys through optimized processing of rapidly quenched amorphous precursors. In: Scientific reports. 2018 ; Vol. 8, No. 1.
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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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Kim, SY, Lee, GY, Park, GH, Kim, HA, Lee, AY, Scudino, S, Prashanth, KG, Kim, DH, Eckert, J & Lee, MH 2018, 'High strength nanostructured Al-based alloys through optimized processing of rapidly quenched amorphous precursors', Scientific reports, vol. 8, no. 1, 1090. https://doi.org/10.1038/s41598-018-19337-7

High strength nanostructured Al-based alloys through optimized processing of rapidly quenched amorphous precursors. / Kim, Song Yi; Lee, Gwang Yeob; Park, Gyu Hyeon; Kim, Hyeon Ah; Lee, A. Young; Scudino, Sergio; Prashanth, Konda Gokuldoss; Kim, Do Hyang; Eckert, Jürgen; Lee, Min Ha.

In: Scientific reports, Vol. 8, No. 1, 1090, 01.12.2018.

Research output: Contribution to journalArticle

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AU - Scudino, Sergio

AU - Prashanth, Konda Gokuldoss

AU - Kim, Do Hyang

AU - Eckert, Jürgen

AU - Lee, Min Ha

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N2 - 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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