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Publisher DOI: 10.1155/2014/748595
Title: Modification of magnesium alloys by ceramic particles in gravity die casting
Language: English
Authors: Haßlinger, Urs 
Hartig, Christian 
Hort, Norbert 
Günther, Robert 
Keywords: magnesium wrought alloys;gravity die casting
Issue Date: 30-Oct-2014
Publisher: Hindawi Publishing Corporation
Source: International Journal of Metals, vol. 2014, Article ID 748595, 7 pages, 2014
Journal or Series Name: International journal of metals 
Abstract (english): A critical drawback for the application of magnesium wrought alloys is the limited formability of semifinished products that arises from a strong texture formation during thermomechanical treatment. The ability of second phase particles embedded into the metal matrix to alter this texture evolution is of great interest. Therefore, the fabrication of particle modified magnesium alloys (particle content 0.5–1 wt.-%) by gravity die casting has been studied. Five different types of micron sized ceramic powders (AlN, MgB2, MgO, SiC, and ZrB2) have been investigated to identify applicable particles for the modification. Agglomeration of the particles is revealed to be the central problem for the fabrication process. The main factors that influence the agglomerate size are the particle size and the intensity of melt stirring. Concerning handling, chemical stability in the Mg-Al-Zn alloy system, settling and wetting in the melt, and formation of the microstructure in most cases, the investigated powders show satisfying properties. However, SiC is chemically unstable in aluminum containing alloys. The high density of ZrB2 causes large particles to settle subsequent to stirring resulting in an inhomogeneous distribution of the particles over the cast billet.
DOI: 10.15480/882.1552
ISSN: 2314-680X
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
Funded by: German Research Foundation (DFG) in the priority program SPP 1168 “InnoMagTec.”
License: CC BY 3.0 (Attribution) CC BY 3.0 (Attribution)
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