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Nguyen NTC, Asghari-Rad P, Sathiyamoorthi P, Zargaran A, Lee CS, Kim HS. Ultrahigh high-strain-rate superplasticity in a nanostructured high-entropy alloy. Nat Commun 2020; 11:2736. [PMID: 32483194 PMCID: PMC7264233 DOI: 10.1038/s41467-020-16601-1] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/13/2020] [Indexed: 11/22/2022] Open
Abstract
Superplasticity describes a material’s ability to sustain large plastic deformation in the form of a tensile elongation to over 400% of its original length, but is generally observed only at a low strain rate (~10−4 s−1), which results in long processing times that are economically undesirable for mass production. Superplasticity at high strain rates in excess of 10−2 s−1, required for viable industry-scale application, has usually only been achieved in low-strength aluminium and magnesium alloys. Here, we present a superplastic elongation to 2000% of the original length at a high strain rate of 5 × 10−2 s−1 in an Al9(CoCrFeMnNi)91 (at%) high-entropy alloy nanostructured using high-pressure torsion. The high-pressure torsion induced grain refinement in the multi-phase alloy combined with limited grain growth during hot plastic deformation enables high strain rate superplasticity through grain boundary sliding accommodated by dislocation activity. Superplasticity at high strain rates is challenging to achieve in high strength materials. Here, the authors show superplastic elongation in excess of 2000% in a high entropy alloy nanostructured by high-pressure torsion.
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Affiliation(s)
- Nhung Thi-Cam Nguyen
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.,Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Peyman Asghari-Rad
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.,Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Praveen Sathiyamoorthi
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.,Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Alireza Zargaran
- Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Chong Soo Lee
- Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Hyoung Seop Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea. .,Center for High Entropy Alloys, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea. .,Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.
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Sato E, Kuribayashi K, Horiuchi R. A Mechanism of Superplastic Deformation and Deformation Induced Grain Growth Based on Grain Switching. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-196-27] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTGrain growth depending on strain is generally observed during structural superplasticity. A new deformation model is proposed in order to explain this grain growth.This model is based on grain switching by Ashby and Verrall. The modification is to introduce grain size irregularity. The grain structure with minimum irregularity consists of one 5–7 pair in hexagonal array, which corresponds to edge dislocation. While the tensile stress oblique to the pair results the grain switching described by dislocation glide, the stress parallel to it results the grain switching which transforms the pentagon into the quadrilateral and then removes it. The latter can be described by dislocation climb and results the enhancement of grain growth. The expansion into three dimensions is discussed.
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Abstract
Generally, three typical behaviors are recognized in hot-deformation of austenite. However, considering that those austenite grains involved in single-pass deformation are mostly on the scale of dozens of micrometers or even much larger than that, it is meaningful to investigate hot-deformation behaviors of austenite grains smaller than 10μm. In the current paper, austenite grains of different sizes were prepared through repetitive treatment of rapid reheating and quenching with changing the holding temperature and/or holding time. Kinds of true stress-true strain curves at 900oC and 950oC indicate that austenitic deformation can be gradually coordinated by grain boundary behaviors, such as grain boundary sliding and/or diffusion. Simultaneously, the macroscopic deformation is more likely to be dominated through co-operation grain boundary sliding (CGBS).
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ROFMAN O, BATE P, BROUGH I, HUMPHREYS F. Study of dynamic grain growth by electron microscopy and EBSD. J Microsc 2009; 233:432-41. [DOI: 10.1111/j.1365-2818.2009.03131.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lall P, Islam M, Rahim M, Suhling J. Prognostics and Health Management of Electronic Packaging. ACTA ACUST UNITED AC 2006. [DOI: 10.1109/tcapt.2005.850520] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dunne FPE, Kim TW. Inhomogeneous deformation and failure in superplasticity. Proc Math Phys Eng Sci 1999. [DOI: 10.1098/rspa.1999.0331] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- F. P. E. Dunne
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
| | - T. -W. Kim
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
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Zelin M, Mukherjee A. Cooperative phenomena at grain boundaries during superplastic flow. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0956-7151(94)00428-5] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sherwood DJ, Hamilton CH. The neighbour-switching mechanism of superplastic deformation: The constitutive relationship and deformation-enhanced grain growth. ACTA ACUST UNITED AC 1994. [DOI: 10.1080/01418619408242541] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Perevezentsev V, Rybin V, Chuvil'deev V. The theory of structural superplasticity—I. The physical nature of the superplasticity phenomenon. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0956-7151(92)90065-m] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sherwood D, Hamilton C. A mechanism for deformation-enhanced grain growth in single phase materials. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0956-716x(91)90172-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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On the spreading of grain boundary dislocations and its effect on grain boundary properties. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0956-7151(91)90158-w] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Simulation of static and deformation-enhanced grain growth effects on superplastic ductility. ACTA ACUST UNITED AC 1989. [DOI: 10.1007/bf02670170] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Superplastic Aluminum Alloys. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/b978-0-12-341831-9.50012-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Ghosh A, Raj R. A model for the evolution of grain size distribution during superplastic deformation. ACTA ACUST UNITED AC 1986. [DOI: 10.1016/0001-6160(86)90080-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Pandey M, Wadsworth J, Mukherjee A. Concurrent grain growth in two superplastic aluminum-lithium based alloys. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0036-9748(85)90244-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wilkinson D, Cáceres C. On the mechanism of strain-enhanced grain growth during superplastic deformation. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0001-6160(84)90079-8] [Citation(s) in RCA: 153] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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An evaluation of available data for strain-enhanced grain growth during superplastic flow. ACTA ACUST UNITED AC 1984. [DOI: 10.1007/bf00724376] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Suéry M. Prediction of elongation of superplastic materials — influence of grain growth and cavitation. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0036-9748(84)90447-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Cáceres C, Wilkinson D. Large strain behaviour of a superplastic copper alloy—I. Deformation. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0001-6160(84)90115-9] [Citation(s) in RCA: 101] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Low stress creep of fine-grained materials at intermediate temperatures: Diffusional creep or grain boundary sliding? ACTA ACUST UNITED AC 1982. [DOI: 10.1016/0025-5416(82)90169-0] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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On concurrent grain growth and deformation mechanism in region I for superplastic Zn-22% A1 eutectoid alloy. ACTA ACUST UNITED AC 1979. [DOI: 10.1016/0036-9748(79)90218-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Valiev RZ, Kaibyshev OA, Khannanov SK. Grain boundaries during superplastic deformation. ACTA ACUST UNITED AC 1979. [DOI: 10.1002/pssa.2210520212] [Citation(s) in RCA: 40] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Valiev RZ, Kaibyshev OA. Mechanism of superplastic deformation in a magnesium alloy. II. The role of grain boundaries. ACTA ACUST UNITED AC 1977. [DOI: 10.1002/pssa.2210440209] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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The in-situ observation of superplasticity of an AlCu eutectic alloy by transmission electron microscopy. ACTA ACUST UNITED AC 1977. [DOI: 10.1016/0036-9748(77)90012-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Review Topics in Superplasticity. ACTA ACUST UNITED AC 1975. [DOI: 10.1016/b978-0-12-341806-7.50011-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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