Creep and rupture properties of a squeeze-cast Mg-Al-Ca alloy |
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| Authors: | S M Zhu J F Nie B L Mordike |
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| Affiliation: | (1) ARC Centre of Excellence for Design in Light Metals, Department of Materials Engineering, Monash University, 3800 Victoria, Australia;(2) Institute of Materials Engineering and Technology, Technical University of Clausthal, D-38678 Clausthal-Zellerfeld, Germany |
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| Abstract: | A squeeze-cast Mg-Al-Ca alloy (MRI153) was creep tested at 150, 175, and 200 °C under applied stresses in the range of 30
to 120 MPa. The creep curves were characterized by an extended tertiary stage in which the creep rate increases progressively
with the creep strain. Microstructural examinations revealed the precipitation and coarsening of new particles during creep.
The stress dependence of the minimum creep rate suggests a transition from power-law creep at low stresses to power-law breakdown
at high stresses. Creep rupture of this alloy occurred as a result of cavitation damage at dendritic grain boundaries, with
the creep rupture time and the minimum creep rate following the empirical Monkman-Grant equation. A comparison is made between
the creep and rupture properties of MRI153 and those of a squeeze-cast Mg-Al alloy (AZ91). |
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