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Journal of Materials Engineering and Performance

Erschienen in:

06.12.2018

Influence of Ca and Sr Addition on Impression Creep Behavior of Mg-4Al-RE Alloy

verfasst von: Yaocheng Zhang, Li Yang, Chenglin Ge, Song Pang, Xiaopin Wang, Zhiwei Zhang, Zhaoxia Han

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 1/2019

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Abstract

The impression creep behavior of Mg-4Al-RE-0.8Ca-0.2Sr (AEXJ4110) alloy was investigated under the applied stresses of 55, 75, 95 MPa and the temperatures of 398, 423, 448 K on a special apparatus. The results showed that the microstructure of AEXJ4110 alloy consisted of acicular Al₁₁La₃, granular Al₂La, bone shape Al₂Ca and fish-bone shape Al₄Sr. The impression creep resistance of AE41 alloy was improved by adding Ca and Sr. The primary impression creep depth of AEXJ4110 alloy was increased with increasing applied stress and temperature. The creep strain rates of AEXJ4110 alloy under different stresses and temperatures were a power function of time. The constitutive equation of steady-state impression creep for AEXJ4110 alloy can be written as \(\dot{\varepsilon }_{\text{s}} = 9.71 \times 10^{ - 3} (E/T)(\sigma /E)^{4.3} \exp (( - 100.449 + 3368.98(\sigma /E))/RT)\) with stress exponent n 4.3 and creep activation energy Q_c about 100.449 kJ/mol. The impression creep mechanism of AEXJ4110 alloy in the temperature range of 398-448 K and stress range of 55-95 MPa is controlled by dislocation climb dominated by self-diffusion of magnesium atoms impeded by the precipitated phases with high melting temperatures.

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Titel: Influence of Ca and Sr Addition on Impression Creep Behavior of Mg-4Al-RE Alloy
verfasst von: Yaocheng Zhang
Li Yang
Chenglin Ge
Song Pang
Xiaopin Wang
Zhiwei Zhang
Zhaoxia Han
Publikationsdatum: 06.12.2018
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 1/2019
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3783-y

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