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Study Data from Singapore National University Update Knowledge of Materials Engineering

January 22, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- Researchers detail new data in Materials Engineering. According to news originating from Singapore, Singapore, by VerticalNews correspondents, research stated, "Processing map for hot working of hot extruded AZ31-1.5 vol% nano-alumina magnesium composite (AZ31-NAL) prepared by disintegrated metal deposition (DMD) technique has been developed in the temperature range of 250-500 degrees C and strain rate range of 0.0003-10 s(-1). The starting composite microstructure is fine grained and is much less textured compared with the base AZ31 material prepared by similar technique (AZ31-DMD)."

Our news journalists obtained a quote from the research from Singapore National University, "The processing map for the composite exhibits three domains in the temperature and strain rate ranges: (1) 250-350 degrees C/0.0003-0.01 s(-1); (2) 375-500 degrees C/0.0003-0.01 s(-1); (3) 300-400 degrees C/1-10 s(-1), which are all similar to those exhibited by the base alloy. In Domains #1 and #3, dynamic recrystallization occurs and results in fine grained microstructure, while in Domain #2, grain boundary sliding leading to wedge cracking in compression and intercrystalline cracking in tension have been identified. In comparison with the base alloy AZ31-DMD, the efficiency in the first domain has decreased, the third domain moved to lower temperatures and the effect on second domain is marginal. These differences are attributed to the lower intensity of starting texture in the nano-composite compared with the base alloy."

According to the news editors, the research concluded: "A study of texture changes in the deformed specimens revealed that nano-alumina additions are helpful in reducing the preferred orientation in AZ31 alloy."

For more information on this research see: Hot deformation mechanisms, microstructure and texture evolution in extruded AZ31-nano-alumina composite. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2014;589():41-49. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland.

The news correspondents report that additional information may be obtained from T. Zhong, Singapore National University, Dept. of Mech Engn, Singapore 117575, Singapore. Additional authors for this research include K.P. Rao, Y. Prasad, F. Zhao and M. Gupta.

Keywords for this news article include: Asia, Materials Engineering

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Source: Journal of Engineering


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