Key factor influencing the ignition resistance of magnesium alloys at elevated temperatures

2011 ◽  
Vol 65 (11) ◽  
pp. 958-961 ◽  
Author(s):  
Young Min Kim ◽  
Chang Dong Yim ◽  
Ha Sik Kim ◽  
Bong Sun You
Keyword(s):  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Key Factor

Newly Developed Heat Resistant Magnesium Alloy by Thixomolding®

2005 ◽  
Vol 488-489 ◽  
pp. 287-290 ◽  
Author(s):  
Tadayoshi Tsukeda ◽  
Ken Saito ◽  
Mayumi Suzuki ◽  
Junichi Koike ◽  
Kouichi Maruyama
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Die Casting ◽  
The Other ◽  
Heat Resistant ◽  
Higher Temperature ◽  
Better Than

We compared the newly developed heat resistant magnesium alloy with conventional ones by Thixomolding® and aluminum alloy by die casting. Tensile properties at elevated temperatures of AXEJ6310 were equal to those of ADC12. In particular, elongation tendency of AXEJ6310 at higher temperature was better than those of the other alloys. Creep resistance of AXEJ6310 was larger than that of AE42 by almost 3 orders and smaller than that of ADC12 by almost 2 orders of magnitude. Fatigue limits at room temperature and 423K of AXEJ6310 was superior among conventional magnesium alloys.

scholarly journals Elastic Properties and Internal Friction of Two Magnesium Alloys at Elevated Temperatures

2011 ◽  
Author(s):  
M. Freels ◽  
P. K. Liaw ◽  
E. Garlea ◽  
J. S. Morrell ◽  
M. Radiovic
Keyword(s):  
Internal Friction ◽  
Magnesium Alloys ◽  
Elastic Properties ◽  
Elevated Temperatures

scholarly journals Comparison of High-Temperature Compression and Compression-Compression Fatigue Behavior of Magnesium Alloys DieMag422 and AE42

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 497 ◽  
Author(s):  
Mirko Teschke ◽  
Alexander Koch ◽  
Frank Walther
Keyword(s):  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Fatigue Behavior ◽  
Weight Ratio ◽  
High Strength ◽  
Fatigue Tests ◽  
Fracture Mechanisms ◽  
Compression Tests ◽  
Computed Tomographic ◽  
Tensile Fatigue

Due to their high strength-to-weight-ratio, magnesium alloys are very attractive for use in automotive engineering. For application at elevated temperatures, the alloys must be creep-resistant. Therefore, the influence of the operating temperature on the material properties under quasistatic and cyclic load has to be understood. A previous study investigated tensile-tensile fatigue behavior of the magnesium alloys DieMag422 and AE42 at room temperature (RT). The aim of this study was the comparison of both alloys regarding compression, tensile, and compression-compression fatigue behavior. The quasistatic behavior was determined by means of tensile and compression tests, and the tensile-compression asymmetry was analyzed. In temperature increase fatigue tests (TIFT) and constant amplitude tests (CAT), the temperature influence on the cyclic creeping (ratcheting) behavior was investigated, and mechanisms-relevant test temperatures were determined. Furthermore, characteristic fracture mechanisms were evaluated with investigations of the microstructure and the fracture surfaces. The initial material was analyzed in computed tomographic scans and energy dispersive X-ray (EDX) analyses.

scholarly journals Microstructure and Properties of Selected Magnesium-Aluminum Alloys Prepared for SPD Processing Technology

2017 ◽  
Vol 62 (4) ◽  
pp. 2365-2370 ◽  
Author(s):  
L. Cizek ◽  
S. Rusz ◽  
O. Hilser ◽  
R. Śliwa ◽  
D. Kuc ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloys ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Deformation Behaviour ◽  
Az91 Alloy ◽  
Test Results ◽  
Treatment Conditions ◽  
Composition Modification ◽  
Cast Magnesium

AbstractA growing interest in wrought magnesium alloys has been noticed recently, mainly due to development of various SPD (severe plastic deformation) methods that enable significant refinement of the microstructure and – as a result – improvement of various functional properties of products. However, forming as-cast magnesium alloys with the increased aluminum content at room temperature is almost impossible. Therefore, application of heat treatment before forming or forming at elevated temperature is recommended for these alloys. The paper presents the influence of selected heat treatment conditions on the microstructure and the mechanical properties of the as-cast AZ91 alloy. Deformation behaviour of the as-cast AZ61 alloy at elevated temperatures was analysed as well. The microstructure analysis was performed by means of both light microscopy and SEM. The latter one was used also for fracture analysis. Moreover, the effect of chemical composition modification by lithium addition on the microstructure of the AZ31-based alloy is presented. The test results can be helpful in preparation of the magnesium-aluminum alloys for further processing by means of SPD methods.

scholarly journals Microstructure and Properties of Magnesium Alloys Working at Elevated Temperatures

2014 ◽  
Vol 14 (2) ◽  
pp. 238-244 ◽  
Author(s):  
Jan Serak ◽  
Milena Voderova ◽  
Dalibor Vojtech ◽  
Pavel Novak
Keyword(s):  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Microstructure And Properties

scholarly journals Constraints on microbial communities, decomposition and methane production in deep peat deposits

2019 ◽  
Author(s):  
L.A. Kluber ◽  
E.R. Johnston ◽  
S.A. Allen ◽  
J.N. Hendershot ◽  
P.J. Hanson ◽  
...  
Keyword(s):  
Microbial Community ◽  
Microbial Communities ◽  
Elevated Temperatures ◽  
Future Climate Change ◽  
Microbial Decomposition ◽  
Ombrotrophic Peatland ◽  
Peat Deposits ◽  
Global Soil ◽  
Key Factor ◽  
High Concentrations

AbstractPeatlands play outsized roles in the global carbon cycle. Despite occupying a rather small fraction of the terrestrial biosphere (∼3%), these ecosystems account for roughly one third of the global soil carbon pool. This carbon is largely comprised of undecomposed deposits of plant material (peat) that may be meters thick. The fate of this deep carbon stockpile with ongoing and future climate change is thus of great interest and has large potential to induce positive feedback to climate warming. Recent in situ warming of an ombrotrophic peatland indicated that the deep peat microbial communities and decomposition rates were resistant to elevated temperatures. In this experiment, we sought to understand how nutrient and pH limitations may interact with temperature to limit microbial activity and community composition. Anaerobic microcosms of peat collected from 1.5 to 2 meters in depth were incubated at 6°C and 15°C with elevated pH, nitrogen (NH4Cl), and/or phosphorus (KH2PO4) in a full factorial design. The production of CO2 and CH4 was significantly greater in microcosms incubated at 15°C, although the structure of the microbial community did not differ between the two temperatures. Increasing the pH from ∼3.5 to ∼5.5 altered microbial community structure, however increases in CH4 production were non-significant. Contrary to expectations, N and P additions did not increase CO2 and CH4 production, indicating that nutrient availability was not a primary constraint in microbial decomposition of deep peat. Our findings indicate that temperature is a key factor limiting the decomposition of deep peat, however other factors such as the availability of O2 or alternative electron donors and high concentrations of phenolic compounds, may also exert constraints. Continued experimental peat warming studies will be necessary to assess if the deep peat carbon bank is susceptible to increased temperatures over the longer time scales.

Effect of Ca addition on the oxidation resistance of AZ91 magnesium alloys at elevated temperatures

2003 ◽  
Vol 9 (4) ◽  
pp. 395-398 ◽  
Author(s):  
Byung-Ho Choi ◽  
Bong-Sun You ◽  
Won-Wook Park ◽  
Yan-Bin Huang ◽  
Ik-Min Park
Keyword(s):  
Oxidation Resistance ◽  
Magnesium Alloys ◽  
Elevated Temperatures ◽  
Ca Addition ◽  
Az91 Magnesium
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