Monitoring eutectoid decomposition process of metastable phases in Al-Sm alloy via in-situ X-ray scattering and ex-situ transmission electron microscopy

Meng, Fanqiang; Wang, Wenjie; Kramer, Matthew J.

doi:10.1016/j.matchar.2020.110665

Title: Monitoring eutectoid decomposition process of metastable phases in Al-Sm alloy via in-situ X-ray scattering and ex-situ transmission electron microscopy

Abstract

Metallic glasses, formed from highly undercooled liquids, are ideal systems for fine tuning microstructures. The structure of the glass and the slow kinetics of devitrification provide many possible reaction pathways to form both stable and metastable phases. The Al-RE system is a prime example with many metastable-to-metastable phase transitions. In this paper we report observation of the transition from ε-Al₆₀Sm₁₁ to π-Al₅Sm and fcc-Al using multiple ex-situ and in-situ methods. Ex-situ transmission electron microscope (TEM) observation demonstrates that the decomposition of ε-Al60Sm11 propagates with nearly identical spacing between fcc-Al and π-Al₅Sm during isothermal annealing. In-situ high energy wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) methods were employed along with the DSC demonstrate the multiple phase evolution with temperature and time. A novel SAXS analysis approach is presented and validated by ex-situ TEM analysis. These results suggest that nearly monodispersed Al-nanocrystals forms at a constant rate during an isothermal annealing. Both in-situ and ex-situ observations elucidate the transition from ε-Al₆₀Sm₁₁ to π-Al₅Sm and fcc-Al as an eutectoid reaction.

Authors:

Meng, Fanqiang ^[1]; Wang, Wenjie ^[2]; Kramer, Matthew J. ^[2]

Sun Yat-Sen Univ., Guangdong (China)
Ames Lab., Ames, IA (United States)

Publication Date:: Thu Sep 24 00:00:00 EDT 2020

Research Org.:: Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Key Research and Development Program; USDOE

OSTI Identifier:: 1722886

Alternate Identifier(s):: OSTI ID: 1809716

Report Number(s):: IS-J-10,355
Journal ID: ISSN 1044-5803

Grant/Contract Number:: AC02-07CH11358; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Materials Characterization

Additional Journal Information:: Journal Volume: 170; Journal ID: ISSN 1044-5803

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Phase transformation; Aluminum rare earth alloy; High energy x-ray diffraction; Small angle x-ray scattering

Citation Formats


                    Meng, Fanqiang, Wang, Wenjie, and Kramer, Matthew J. Monitoring eutectoid decomposition process of metastable phases in Al-Sm alloy via in-situ X-ray scattering and ex-situ transmission electron microscopy.  United States: N. p., 2020. 
Web.  doi:10.1016/j.matchar.2020.110665.

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                    Meng, Fanqiang, Wang, Wenjie, & Kramer, Matthew J. Monitoring eutectoid decomposition process of metastable phases in Al-Sm alloy via in-situ X-ray scattering and ex-situ transmission electron microscopy.  United States.  https://doi.org/10.1016/j.matchar.2020.110665

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                    Meng, Fanqiang, Wang, Wenjie, and Kramer, Matthew J. Thu .  
"Monitoring eutectoid decomposition process of metastable phases in Al-Sm alloy via in-situ X-ray scattering and ex-situ transmission electron microscopy".  United States.  https://doi.org/10.1016/j.matchar.2020.110665.  https://www.osti.gov/servlets/purl/1722886.

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@article{osti_1722886,

  title        = {Monitoring eutectoid decomposition process of metastable phases in Al-Sm alloy via in-situ X-ray scattering and ex-situ transmission electron microscopy},

  author       = {Meng, Fanqiang and Wang, Wenjie and Kramer, Matthew J.},

  abstractNote = {Metallic glasses, formed from highly undercooled liquids, are ideal systems for fine tuning microstructures. The structure of the glass and the slow kinetics of devitrification provide many possible reaction pathways to form both stable and metastable phases. The Al-RE system is a prime example with many metastable-to-metastable phase transitions. In this paper we report observation of the transition from ε-Al60Sm11 to π-Al5Sm and fcc-Al using multiple ex-situ and in-situ methods. Ex-situ transmission electron microscope (TEM) observation demonstrates that the decomposition of ε-Al60Sm11 propagates with nearly identical spacing between fcc-Al and π-Al5Sm during isothermal annealing. In-situ high energy wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) methods were employed along with the DSC demonstrate the multiple phase evolution with temperature and time. A novel SAXS analysis approach is presented and validated by ex-situ TEM analysis. These results suggest that nearly monodispersed Al-nanocrystals forms at a constant rate during an isothermal annealing. Both in-situ and ex-situ observations elucidate the transition from ε-Al60Sm11 to π-Al5Sm and fcc-Al as an eutectoid reaction.},

  doi          = {10.1016/j.matchar.2020.110665},

  journal      = {Materials Characterization},

  number       = ,

  volume       = 170,

  place        = {United States},

  year         = {Thu Sep 24 00:00:00 EDT 2020},

  month        = {Thu Sep 24 00:00:00 EDT 2020}

}

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Title: Monitoring eutectoid decomposition process of metastable phases in Al-Sm alloy via in-situ X-ray scattering and ex-situ transmission electron microscopy

Abstract

Citation Formats

Amorphous, nanoquasicrystalline and nanocrystalline alloys in Al-based systems journal, December 1998

Aluminum-Based Amorphous Alloys with Tensile Strength above 980 MPa (100 kg/mm 2 ) journal, April 1988

Mechanical behavior of amorphous alloys journal, July 2007

Al-based amorphous alloys: Glass-forming ability, crystallization behavior and effects of minor alloying additions journal, June 2017

Characterization of a marginal glass former alloy solidified in gas atomized powders journal, August 2008

Nanocrystal development during primary crystallization of amorphous alloys journal, January 1998

Fabrication and novel properties of nanostructured Al base alloys journal, May 1994

Spatially-correlated site occupancy in the nonstoichiometric meta-stable ε -Al60Sm11 phase during devitrification of Al-10.2 at.% Sm glasses journal, September 2018

Competitive devitrification and metastable phase selection in amorphous Al–Sm journal, March 2020

Discovery of a meta-stable Al–Sm phase with unknown stoichiometry using a genetic algorithm journal, June 2014

Discovery of a metastable Al20Sm4 phase journal, March 2015

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations journal, February 2019

In situ transmission electron microscopy study of the crystallization of Ge2Sb2Te5 journal, February 2004

Investigation of deformation and microstructural evolution in Grade 91 ferritic–martensitic steel by in situ high-energy X-rays journal, January 2014

Crystallization behavior in a highly driven marginal glass forming alloy journal, May 2008

The role of amorphous precursor in phase selection hierarchy in marginal metallic glasses journal, December 2016

‘Crystal Genes’ in Metallic Liquids and Glasses journal, March 2016

A new Guinier–Porod model journal, May 2010

A review of small-angle scattering models for random segmented poly(ether-urethane) copolymers journal, September 2004

X-ray Scattering Study of Early Stage Spinodal Decomposition in Al 0.62 Zn 0.38 journal, April 1997

Early stages of spinodal decomposition in an aluminum-zinc alloy journal, June 1967

Phase decomposition of liquid-quenched Al-14 at. % Ag: small-angle X-ray scattering study journal, July 1974

Amorphous, nanoquasicrystalline and nanocrystalline alloys in Al-based systems
journal, December 1998

Aluminum-Based Amorphous Alloys with Tensile Strength above 980 MPa (100 kg/mm ² )
journal, April 1988

Mechanical behavior of amorphous alloys
journal, July 2007

Al-based amorphous alloys: Glass-forming ability, crystallization behavior and effects of minor alloying additions
journal, June 2017

Characterization of a marginal glass former alloy solidified in gas atomized powders
journal, August 2008

Nanocrystal development during primary crystallization of amorphous alloys
journal, January 1998

Fabrication and novel properties of nanostructured Al base alloys
journal, May 1994

Spatially-correlated site occupancy in the nonstoichiometric meta-stable $ε$ -Al60Sm11 phase during devitrification of Al-10.2 at.% Sm glasses
journal, September 2018

Competitive devitrification and metastable phase selection in amorphous Al–Sm
journal, March 2020

Discovery of a meta-stable Al–Sm phase with unknown stoichiometry using a genetic algorithm
journal, June 2014

Discovery of a metastable Al20Sm4 phase
journal, March 2015

An abnormal meta-stable nanoscale eutectic reaction revealed by in-situ observations
journal, February 2019

In situ transmission electron microscopy study of the crystallization of Ge2Sb2Te5
journal, February 2004

Investigation of deformation and microstructural evolution in Grade 91 ferritic–martensitic steel by in situ high-energy X-rays
journal, January 2014

Crystallization behavior in a highly driven marginal glass forming alloy
journal, May 2008

The role of amorphous precursor in phase selection hierarchy in marginal metallic glasses
journal, December 2016

‘Crystal Genes’ in Metallic Liquids and Glasses
journal, March 2016

A new Guinier–Porod model
journal, May 2010

A review of small-angle scattering models for random segmented poly(ether-urethane) copolymers
journal, September 2004

X-ray Scattering Study of Early Stage Spinodal Decomposition in ${Al}_{0.62} {Zn}_{0.38}$
journal, April 1997

Early stages of spinodal decomposition in an aluminum-zinc alloy
journal, June 1967

Phase decomposition of liquid-quenched Al-14 at. % Ag: small-angle X-ray scattering study
journal, July 1974