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Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis.

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Title: Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis.
Authors: Ahmmed, Kazi F.1, Balogh, Levente1, Idrees, Yasir1, Yu, Hongbing1, Long, Fei1, Daymond, Mark R.1
Source: Journal of Applied Crystallography. Oct2016, Vol. 49 Issue 5, p1609-1623. 14p.
Subjects: Neutron diffraction crystallography, Zirconium alloys, Effect of heat treatment on microstructure, Martensite, Dislocation density, Transmission electron microscopy
Abstract: Neutron diffraction line profile analysis (DLPA) and transmission electron microscopy were used to characterize the components of the bimodal microstructure of Zr-Excel (Zr-3.5Sn-0.8Mo-0.8Nb), a nuclear structural material. The dual microstructure, consisting of equiaxed primary grains and martensitic domains both having hexagonal close-packed (h.c.p.) α crystal structure, forms when the as-received Zr-Excel alloy is heat treated at a high temperature and subsequently quenched, i.e. is solution treated. Because both microstructure components have the same crystal structure the reflections from the two components overlap significantly. The article presents how the multi-phase analysis capability of modern DLPA methods can be used to model the measured neutron diffraction patterns as the sum of two sub-patterns corresponding to the components of such a bimodal microstructure, which can be found in many hexagonal alloys relevant for industrial applications. The results show that the large equiaxed primary h.c.p. α grains have a highly correlated low-density dislocation structure and large sub-grains (∼300 nm), while the large martensitic domains have a randomly arranged very high density dislocation structure and sub-grains the size of ∼30 nm. The significantly different defect structures of the primary and martensitic phases manifest as large differences in the hardness and ductility of the individual components. As a result of this duality of the mechanical properties, solution-treated Zr-Excel materials can be considered as analogous to metal matrix composites where a softer ductile matrix contains a harder brittle reinforcing phase. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Applied Crystallography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Applied+Crystallography%22">Journal of Applied Crystallography</searchLink>. Oct2016, Vol. 49 Issue 5, p1609-1623. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Neutron+diffraction+crystallography%22">Neutron diffraction crystallography</searchLink><br /><searchLink fieldCode="DE" term="%22Zirconium+alloys%22">Zirconium alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Effect+of+heat+treatment+on+microstructure%22">Effect of heat treatment on microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Martensite%22">Martensite</searchLink><br /><searchLink fieldCode="DE" term="%22Dislocation+density%22">Dislocation density</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink>
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  Data: Neutron diffraction line profile analysis (DLPA) and transmission electron microscopy were used to characterize the components of the bimodal microstructure of Zr-Excel (Zr-3.5Sn-0.8Mo-0.8Nb), a nuclear structural material. The dual microstructure, consisting of equiaxed primary grains and martensitic domains both having hexagonal close-packed (h.c.p.) α crystal structure, forms when the as-received Zr-Excel alloy is heat treated at a high temperature and subsequently quenched, i.e. is solution treated. Because both microstructure components have the same crystal structure the reflections from the two components overlap significantly. The article presents how the multi-phase analysis capability of modern DLPA methods can be used to model the measured neutron diffraction patterns as the sum of two sub-patterns corresponding to the components of such a bimodal microstructure, which can be found in many hexagonal alloys relevant for industrial applications. The results show that the large equiaxed primary h.c.p. α grains have a highly correlated low-density dislocation structure and large sub-grains (∼300 nm), while the large martensitic domains have a randomly arranged very high density dislocation structure and sub-grains the size of ∼30 nm. The significantly different defect structures of the primary and martensitic phases manifest as large differences in the hardness and ductility of the individual components. As a result of this duality of the mechanical properties, solution-treated Zr-Excel materials can be considered as analogous to metal matrix composites where a softer ductile matrix contains a harder brittle reinforcing phase. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Applied Crystallography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1107/S1600576716011924
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        Text: English
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        PageCount: 14
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        Type: general
      – SubjectFull: Zirconium alloys
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      – SubjectFull: Effect of heat treatment on microstructure
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      – SubjectFull: Martensite
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      – SubjectFull: Dislocation density
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      – SubjectFull: Transmission electron microscopy
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      – TitleFull: Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis.
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              Text: Oct2016
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