Accession Number : ADA344921


Title :   Processing of In-Situ Al-AlN Metal Matrix Composites via Direct Nitridation Method


Corporate Author : POHANG UNIV OF SCIENCE AND TECHNOLOGY (KOREA) CENTER FOR ADVANCED AEROSPACE MATERIALS


Personal Author(s) : Shin, Kwang S. ; Kim, Yong-Seog ; Kim, Nack J.


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a344921.pdf


Report Date : APR 1998


Pagination or Media Count : 47


Abstract : The primary objective of the present research was to provide a fundamental understanding of the processing science necessary to fabricate the Aluminum Nitride (AlN) reinforced Aluminum (Al) composites via direct nitration of the Al alloy melt. From the thermodynamic considerations, it was found that reduction of oxygen content below the critical level in the reaction gas was crucial for the successful formation of AlN. It was possible to produce a considerable amount of AlN particles in the Al matrix at a reaction temperature as low as 900 "C" utilizing the in-situ nitration reaction process developed in the present study. The volume fraction of AlN increase almost linearly with increasing the magnesium (Mg) content in the alloy and the reaction time. The shapes of AlN particles were found to be polygon, plate of rod-type, whose sizes were in the range from submicron to a few microns. From the present study, it is concluded that the new innovative in-situ nitridation process developed in the present study can be successfully applied for processing of high strength Al-AlN composites.


Descriptors :   *METAL MATRIX COMPOSITES , *NITRATION , ALUMINUM ALLOYS , THERMODYNAMICS , X RAY DIFFRACTION , NITRIDES , KOREA , THERMOGRAVIMETRIC ANALYSIS.


Subject Categories : INDUSTRIAL CHEMISTRY AND CHEMICAL PROCESSING
      LAMINATES AND COMPOSITE MATERIALS


Distribution Statement : APPROVED FOR PUBLIC RELEASE