|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Development of Low Expansion and High Strength Aluminium Hybrid Composite
||Jamuna Sethi, Siddhartha Das, Karabi Das
|On-Site Speaker (Planned)
An aluminum (Al) matrix hybrid composite reinforced with yttrium tungstate (Y<SUB>2</SUB>W<SUB>3</SUB>O<SUB>12</SUB>) and aluminium nitride (AlN) synthesized by high energy ball milling followed by compaction and sintering. Y<SUB>2</SUB>W<SUB>3</SUB>O<SUB>12</SUB>,a negative thermal expansion material (-7.1x10<SUP>-7</SUP>/⁰C), is chosen as one of the reinforcements to lower the coefficient of thermal expansion (CTE). AlN is added to the composite in order to improve strength and thermal conductivity. X-ray diffraction patterns reveal the presence of Al, AlN, and Y<SUB>2</SUB>W<SUB>3</SUB>O<SUB>12</SUB> peaks indicating no chemical reaction between the matrix and reinforcements. The scanning electron micrograph shows fairly uniform dispersion of reinforcements in the matrix. Hardness, elastic modulus and CTE were measured by Vickers’s hardness tester, nano-indentation test, and dilatometer, respectively. It is observed that a composite with high hardness, high Young’s modulus and low CTE can be obtained by adding 15 wt%AlN and 30 wt%Y<SUB>2</SUB>W<SUB>3</SUB>O<SUB>12</SUB>.
||Planned: Light Metals