Synthesis and characterization of precipitation hardened amorphous matrix composite by mechanical alloying and pulse plasma sintering of Al65Cu20Ti15 |
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| Authors: | D. Roy S.S. Singh R. Mitra M. Rosinski A. Michalski W. Lojkowski |
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| Affiliation: | 1. Metallurgical and Materials Engineering Department , Indian Institute of Technology , Kharagpur 721302, India;2. Metallurgical and Materials Engineering Department , NIFFT , Ranchi 834003, India;3. Metallurgical and Materials Engineering Department , Indian Institute of Technology , Kharagpur 721302, India;4. Faculty of Materials Science and Engineering , Warsaw University of Technology , Woloska 141, 02-507 Warsaw, Poland;5. Polish Academy of Sciences , Institute of High Pressure Physics (UNIPRESS) , Sokolowska 29/37, Warszawa 01-142, Poland |
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| Abstract: | This study reports synthesis of Al65Cu20Ti15 amorphous alloy by mechanical alloying and consolidation of the powder mass by pulsed plasma sintering. During sintering, several intermetallic phases precipitate from the amorphous matrix and cause a significant increase in nano-hardness and elastic modulus. Microstructure in as-milled and sintered conditions was characterized by X-ray diffraction, scanning/transmission electron microscopy and differential scanning calorimetric. Among various conditions of sintering, the composites pulse plasma, sintered at 500°C, show the high compression strength (1745 MPa) and high indentation fracture toughness (4.96 MPa m1/2); although, the maximum density (3.73 Mg/in3), nano-hardness (14 GPa) and Young's modulus (208 GPa) in the present alloy have been obtained in the composites pulse plasma sintered at 600°C. |
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| Keywords: | amorphous alloy age hardening nanoscale precipitate mechanical property mechanical alloying pulse plasma sintering |
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