NDLI: Study on the Indentation Creep Behavior of Mg-4Al-RE-0.8Ca Magnesium Alloy

Content Provider	Springer Nature Link
Author	Zhang, Yaocheng Yang, Li Huang, Zedong Dai, Jun
Copyright Year	2015
Abstract	The indentation creep behavior of Mg-4Al-RE-0.8Ca (AEC4108) alloy was investigated with a homemade apparatus. The microstructure of the AEC4108 alloy and the chemical composition of the precipitation phases in the alloy before and after creep test were investigated by scanning electron microscope and energy-dispersive spectroscopy. The results reveal that the steady-state indentation creep rate of the AEC4108 alloy is increased with increasing temperature and applied stress. The logarithm of the steady-state creep rates is linearly related to the logarithm of the stress and the reciprocal of the absolute temperature. The indentation creep parameters of AEC4108 alloy are correlated using an empirical equation $$\dot{\varepsilon }_{\text{s}} = 1.253\; \times \;10^{ - 8} \times σ^{3.2} \;{ \exp }\left[ { - 33.89/\left( {RT} \right)} \right]$$ . The thin acicular Al$_{11}$La$_{3}$ and the bone-shaped Al$_{2}$Ca are precipitated along the grain boundaries, and the granular Al$_{2}$La is formed within the grain. The indentation creep rate of AEC4108 alloy is controlled by the grain boundary slipping led by viscous dislocation movement. The indentation creep resistance of the AEC4108 alloy under temperature 398-448 K and stress 55-95 MPa is guaranteed by the precipitated phases with high thermal stability pinning at the grain boundary and within the grain.
Starting Page	4290
Ending Page	4296
Page Count	7
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	24
Issue Number	11
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2015-10-28
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	creep mechanism creep resistance indentation creep microstructure Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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