Journal ArticleDOI
Creep and microstructure of magnesium-aluminum-calcium based alloys
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TLDR
In this article, a ternary intermetallic phase, (Mg,Al)2Ca, was identified in the microstructure of the ACX alloys and is proposed to be responsible for the improved creep resistance of the alloys.Abstract:
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)2Ca, was identified in the microstructure of the ACX alloys and is proposed to be responsible for the improved creep resistance of the alloys.read more
Citations
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Precipitation and Hardening in Magnesium Alloys
TL;DR: In this paper, a review of precipitation in most precipitation-hardenable magnesium alloys is reviewed, and its relationship with strengthening is examined, and it is demonstrated that the precipitation phenomena in these alloys, especially in the very early stage of the precipitation process, are still far from being well understood, and many fundamental issues remain unsolved even after some extensive and concerted efforts made in the past 12 years.
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Recent magnesium alloy development for elevated temperature applications
TL;DR: In this paper, a review of various new magnesium alloys that have been developed in recent years for elevated temperature applications is presented. And the potential applications of these alloys in automotive powertrains are also discussed.
Journal ArticleDOI
Magnesium extrusion alloys: a review of developments and prospects
TL;DR: Magnesium (Mg) alloys have received a significant interest in the past 20 years, owing to a nonlinearly increasing demand for lightweight structural materials as mentioned in this paper, and they have been used in a variety of applications.
Journal ArticleDOI
Solidification paths and eutectic intermetallic phases in Mg-Al-Ca ternary alloys
TL;DR: In this article, the solidification of Mg-Al-Ca ternary alloys in the α-Mg solidification region was investigated by microstructural and thermal analysis, and the liquidus projection was determined.
Journal ArticleDOI
Age-hardening response of Mg-0.3 at.%Ca alloys with different Zn contents
TL;DR: In this article, the authors investigated the age-hardening responses and corresponding microstructures of Mg-Zn 3 alloys by hardness test, transmission electron microscopy (TEM), and high-angle annular dark field-scanning (HAADF-STEM) images.
References
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Book
Binary alloy phase diagrams
TL;DR: Binary Alloy Phase Diagrams, Second Edition, Plus Updates, on CD-ROM offers you the same high-quality, reliable data you'll find in the 3-volume print set published by ASM in 1990.
Journal ArticleDOI
Creep studies of coarse-grained AZ91D magnesium castings
TL;DR: The creep properties of specimens taken from the core of AZ91D magnesium alloy ingots were investigated in the temperature range 120-180°C and stress range 40-115 MPa.
Journal ArticleDOI
Creep studies of AZ91D pressure die casting
M. Regev,E. Aghion,A. Rosen +2 more
TL;DR: In this paper, the creep properties of pressure die cast AZ91D magnesium alloy (9% Al-1% Zn) were investigated in the temperature range of 150-180 °C and load range of 30-100 MPa.
Journal ArticleDOI
Strain-hardening and recovery during the creep of pure polycrystalline magnesium
L. Shi,D.O. Northwood +1 more
TL;DR: In this paper, the authors report on creep and stress relaxation test results for pure polycrystalline magnesium and show that the strain-hardening coefficient remains essentially constant with a magnitude of 0.27 E (E is the elastic modulus) at 200°C and is independent of the applied stress.
Journal ArticleDOI
Creep of die cast AZ91 magnesium at room temperature and low stress
TL;DR: In this paper, the primary and secondary creep rates of die cast AZ91 magnesium were investigated at room temperature while at stresses at least as low as 60 MPa and showed that the dominant creep mechanism may change at stresses below 120 MPa.