Creep and microstructure of magnesium-aluminum-calcium based alloys

This article describes the creep and microstructure of Mg-Al-Ca-based magnesium alloys (designated as ACX alloys, where A stands for aluminum; C for calcium; and X for strontium or silicon) developed for automotive powertrain applications. Important creep parameters, i.e., secondary creep rate and c...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2002-03, Vol.33 (3), p.567-574
Main Authors: LUO, Alan A, BALOGH, Michael P, POWELL, Bob R
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Applied sciences
Automotive supplies
Calcium
Chemical elements
Condensed matter: structure, mechanical and thermal properties
Creep
Exact sciences and technology
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Metals
Metals. Metallurgy
Physics
Silicon
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Summary:This article describes the creep and microstructure of Mg-Al-Ca-based magnesium alloys (designated as ACX alloys, where A stands for aluminum; C for calcium; and X for strontium or silicon) developed for automotive powertrain applications. Important creep parameters, i.e., secondary creep rate and creep strength, for the new alloys are reported. Creep properties of the new alloys are significantly better than those of the AE42 (Mg-4 pct* Al-2 pct RE**) alloy, which is the benchmark creep-resistant magnesium die-casting alloy. Creep mechanisms for different temperature/stress regimes are proposed. A ternary intermetallic phase, (Mg,Al) sub 2 Ca, was identified in the microstructure of the ACX alloys and is proposed to be responsible for the improved creep resistance of the alloys.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-002-0118-1