Ultrasonic stirring as a production process for nanoparticle reinforced magnesium alloys and the compression creep response of ZE10 reinforced with ceria nanoparticles
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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ECCM 2012 - Composites at Venice, Proceedings of the 15th European Conference on Composite Materials. European Society for Composite Materials, ESCM, 2012.
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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T1 - Ultrasonic stirring as a production process for nanoparticle reinforced magnesium alloys and the compression creep response of ZE10 reinforced with ceria nanoparticles
AU - Dieringa, H.
AU - Hort, N.
AU - Kainer, K. U.
N1 - Conference code: 15
PY - 2012
Y1 - 2012
N2 - Magnesium alloys reinforced with ceramic particles at micro-scale sizes have increased hardness and wear resistance. However, to improve their high-temperature strength and creep resistance the particles have to be smaller. The optimum size of particles for Orowan strengthening is a diameter less than 100 nm. With a large surface area compared to their weight, any deagglomeration of the nanoparticles in a magnesium melt is difficult to achieve and so requires additional processing. This study uses power ultrasound to break down the agglomeration and finely disperse the ceria nanoparticles. The materials were cast in a permanent mold, direct chill casting process using ceria nanoparticles with a diameter of 40 nm and ZE10 magnesium alloy. Three materials are compared: pure ZE10, cast with and without power ultrasound, and ZE10 reinforced with 1 vol.-% ceria dispersed with ultrasound. Metallography, hardness tests and density measurements were performed. Compression creep tests at 200°C and constant stresses were also performed and the minimum creep rates determined. Moreover, the stress exponent was calculated and the concept of a threshold stress applied.
AB - Magnesium alloys reinforced with ceramic particles at micro-scale sizes have increased hardness and wear resistance. However, to improve their high-temperature strength and creep resistance the particles have to be smaller. The optimum size of particles for Orowan strengthening is a diameter less than 100 nm. With a large surface area compared to their weight, any deagglomeration of the nanoparticles in a magnesium melt is difficult to achieve and so requires additional processing. This study uses power ultrasound to break down the agglomeration and finely disperse the ceria nanoparticles. The materials were cast in a permanent mold, direct chill casting process using ceria nanoparticles with a diameter of 40 nm and ZE10 magnesium alloy. Three materials are compared: pure ZE10, cast with and without power ultrasound, and ZE10 reinforced with 1 vol.-% ceria dispersed with ultrasound. Metallography, hardness tests and density measurements were performed. Compression creep tests at 200°C and constant stresses were also performed and the minimum creep rates determined. Moreover, the stress exponent was calculated and the concept of a threshold stress applied.
KW - Ceria
KW - Creep
KW - Nanoparticles
KW - ZE10
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84904012691&partnerID=8YFLogxK
M3 - Article in conference proceedings
AN - SCOPUS:84904012691
SN - 9788888785332
BT - ECCM 2012 - Composites at Venice, Proceedings of the 15th European Conference on Composite Materials
PB - European Society for Composite Materials, ESCM
T2 - 15th European Conference on Composite Materials: Composites at Venice, ECCM 2012
Y2 - 24 June 2012 through 28 June 2012
ER -