High-precision isothermal dilatometry as tool for quantitative analysis of precipitation kinetics: case study of dilute Al alloy

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Abstract

An in-depth case study of precipitation kinetics for alloys is presented utilizing recent progress in high-precision isothermal dilatometry by measuring relative length changes down to the range of 10 - 5 and covering large timescales exceeding 10 5 s. Using a dilute Al–Mg–Si alloy as model system, the different phases that form during isothermal heat treatment could quantitatively be analyzed both with respect to the absolute amount of precipitates and with respect to the underlying kinetics. Owing to the distinct length change features upon multi-step precipitation processes, the formation of the metastable β ′ ′- and β -phases can unambigously be detected and furthermore can specifically be distinguished and resolved. From the reaction rate analysis of the precipitation-induced relative length change, that was isothermally measured for temperatures between 170  C and 260  C , the evolution with time of the atomic fraction of both the β ′ ′- and the β -phase was determined. The results were also used to construct the isothermal time–temperature–precipitation diagrams which are important for technologically relevant processes.

LanguageEnglish
Pages5083-5091
JournalJournal of Materials Science
Volume54
Issue number6
DOIs
StatusPublished - 2019

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Kinetics
Chemical analysis
Reaction rates
Precipitates
Heat treatment
Temperature

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

Cite this

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title = "High-precision isothermal dilatometry as tool for quantitative analysis of precipitation kinetics: case study of dilute Al alloy",
abstract = "An in-depth case study of precipitation kinetics for alloys is presented utilizing recent progress in high-precision isothermal dilatometry by measuring relative length changes down to the range of 10 - 5 and covering large timescales exceeding 10 5 s. Using a dilute Al–Mg–Si alloy as model system, the different phases that form during isothermal heat treatment could quantitatively be analyzed both with respect to the absolute amount of precipitates and with respect to the underlying kinetics. Owing to the distinct length change features upon multi-step precipitation processes, the formation of the metastable β ′ ′- and β ′-phases can unambigously be detected and furthermore can specifically be distinguished and resolved. From the reaction rate analysis of the precipitation-induced relative length change, that was isothermally measured for temperatures between 170  ∘C and 260  ∘C , the evolution with time of the atomic fraction of both the β ′ ′- and the β ′-phase was determined. The results were also used to construct the isothermal time–temperature–precipitation diagrams which are important for technologically relevant processes.",
author = "Enzinger, {Robert Josef} and Elisabeth Hengge and Wolfgang Sprengel and Roland W{\"u}rschum",
year = "2019",
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language = "English",
volume = "54",
pages = "5083--5091",
journal = "Journal of Materials Science",
issn = "0022-2461",
publisher = "Springer Netherlands",
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TY - JOUR

T1 - High-precision isothermal dilatometry as tool for quantitative analysis of precipitation kinetics: case study of dilute Al alloy

AU - Enzinger, Robert Josef

AU - Hengge, Elisabeth

AU - Sprengel, Wolfgang

AU - Würschum, Roland

PY - 2019

Y1 - 2019

N2 - An in-depth case study of precipitation kinetics for alloys is presented utilizing recent progress in high-precision isothermal dilatometry by measuring relative length changes down to the range of 10 - 5 and covering large timescales exceeding 10 5 s. Using a dilute Al–Mg–Si alloy as model system, the different phases that form during isothermal heat treatment could quantitatively be analyzed both with respect to the absolute amount of precipitates and with respect to the underlying kinetics. Owing to the distinct length change features upon multi-step precipitation processes, the formation of the metastable β ′ ′- and β ′-phases can unambigously be detected and furthermore can specifically be distinguished and resolved. From the reaction rate analysis of the precipitation-induced relative length change, that was isothermally measured for temperatures between 170  ∘C and 260  ∘C , the evolution with time of the atomic fraction of both the β ′ ′- and the β ′-phase was determined. The results were also used to construct the isothermal time–temperature–precipitation diagrams which are important for technologically relevant processes.

AB - An in-depth case study of precipitation kinetics for alloys is presented utilizing recent progress in high-precision isothermal dilatometry by measuring relative length changes down to the range of 10 - 5 and covering large timescales exceeding 10 5 s. Using a dilute Al–Mg–Si alloy as model system, the different phases that form during isothermal heat treatment could quantitatively be analyzed both with respect to the absolute amount of precipitates and with respect to the underlying kinetics. Owing to the distinct length change features upon multi-step precipitation processes, the formation of the metastable β ′ ′- and β ′-phases can unambigously be detected and furthermore can specifically be distinguished and resolved. From the reaction rate analysis of the precipitation-induced relative length change, that was isothermally measured for temperatures between 170  ∘C and 260  ∘C , the evolution with time of the atomic fraction of both the β ′ ′- and the β ′-phase was determined. The results were also used to construct the isothermal time–temperature–precipitation diagrams which are important for technologically relevant processes.

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