Microstructure evolution and creep behavior of high-pressure die-cast Mg–9Al–1Zn–1Sr alloy

The creep behavior of high-pressure die-cast Mg–9Al–1Zn–1Sr alloy was investigated in detail under temperatures ranging from 130 to 170 °C and stresses of 30–80 MPa. The studied alloy exhibited a high stress exponent of 8.4 and low activation energy of 102 kJ/mol. The obtained high stress exponent i...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 766; p. 138388
Main Authors Jiang, Bo, Zhang, Dongdong, Sun, Chi, Li, Ningxing, Liu, Yongbin, Cao, Zhanyi
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 24.10.2019
Elsevier BV
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Abstract The creep behavior of high-pressure die-cast Mg–9Al–1Zn–1Sr alloy was investigated in detail under temperatures ranging from 130 to 170 °C and stresses of 30–80 MPa. The studied alloy exhibited a high stress exponent of 8.4 and low activation energy of 102 kJ/mol. The obtained high stress exponent in studied alloy indicated the breakdown of the conventional power law. For rationalization, a threshold stress was introduced in the analysis, and then the high stress exponent was modified to be 5.2. Simultaneously, taking into account the significant influence of tested temperature on the minimum creep rate, a normalized stress exponent of 5 was achieved via the normalization method. Both methods suggested that the creep deformation of the studied alloy was mainly controlled by the dislocation climb. Moreover, transmission electron microscopy observations revealed that the origin of the threshold stress could be associated with the Orowan strengthening of γ-Mg17Al12 platelets that dynamically precipitated in Mg matrix during creep. Microstructure analysis results clarified that dislocation climb is the dominant creep mechanism of AZJ911 alloy, while the reticular eutectic Mg17Al12 phase disintegration, dynamical precipitation of γ-Mg17Al12, and twinning also influence the creep deformation of AJZ911 alloy.
AbstractList The creep behavior of high-pressure die-cast Mg–9Al–1Zn–1Sr alloy was investigated in detail under temperatures ranging from 130 to 170 °C and stresses of 30–80 MPa. The studied alloy exhibited a high stress exponent of 8.4 and low activation energy of 102 kJ/mol. The obtained high stress exponent in studied alloy indicated the breakdown of the conventional power law. For rationalization, a threshold stress was introduced in the analysis, and then the high stress exponent was modified to be 5.2. Simultaneously, taking into account the significant influence of tested temperature on the minimum creep rate, a normalized stress exponent of 5 was achieved via the normalization method. Both methods suggested that the creep deformation of the studied alloy was mainly controlled by the dislocation climb. Moreover, transmission electron microscopy observations revealed that the origin of the threshold stress could be associated with the Orowan strengthening of γ-Mg17Al12 platelets that dynamically precipitated in Mg matrix during creep. Microstructure analysis results clarified that dislocation climb is the dominant creep mechanism of AZJ911 alloy, while the reticular eutectic Mg17Al12 phase disintegration, dynamical precipitation of γ-Mg17Al12, and twinning also influence the creep deformation of AJZ911 alloy.
ArticleNumber 138388
Author Jiang, Bo
Cao, Zhanyi
Liu, Yongbin
Zhang, Dongdong
Li, Ningxing
Sun, Chi
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  givenname: Dongdong
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  fullname: Cao, Zhanyi
  email: caozy@jlu.edu.cn
  organization: Key Laboratory of Automobile Materials of Ministry of Education, Department of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun, 130025, PR China
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Magnesium alloys
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Snippet The creep behavior of high-pressure die-cast Mg–9Al–1Zn–1Sr alloy was investigated in detail under temperatures ranging from 130 to 170 °C and stresses of...
The creep behavior of high-pressure die-cast Mg–9Al–1Zn–1Sr alloy was investigated in detail under temperatures ranging from 130 to 170 °C and stresses of...
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StartPage 138388
SubjectTerms Creep behavior
Creep rate
Creep strength
Disintegration
Dislocation mobility
Eutectic alloys
High-pressure die-cast
Impact analysis
Magnesium alloys
Magnesium base alloys
Microstructure
Platelets
Threshold stress
Twinning
Title Microstructure evolution and creep behavior of high-pressure die-cast Mg–9Al–1Zn–1Sr alloy
URI https://dx.doi.org/10.1016/j.msea.2019.138388
https://www.proquest.com/docview/2319470525
Volume 766
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