Synthesis and mechanical properties of bulk Al76Ni8Ti8Zr4Y4 alloy fabricated by consolidation of mechanically alloyed amorphous powders
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Mechanically alloyed amorphous Al76Ni8Ti8Zr4Y4 (at.%) alloy powder was consolidated by high-pressure sintering process. The influence of the consolidation temperature on the structure and mechanical properties of the consolidated bulk alloys was examined by X-ray diffraction (XRD), Optical microscopy (OM), Scanning electron microscopy (SEM), Vickers Hardness Tester and Nano Indenter. Structural investigations of the bulk materials revealed that most of the amorphous structure was retained after consolidation at 623 K, however, compaction at 723 K and 823 K caused crystallization of the amorphous phase with the appearance of white regions. The results also indicate that application of high pressure affected the crystallization products of the present alloy. Micro mechanical analysis showed that the microhardness of the bulk composites increased from 945HV0.1 to 1177HV0.1 with the consolidation temperature increasing. The evolution trends of nanohardness and Young’s modulus agree well with the Vickers hardness testing results, indentation size effect (ISE) is observed in the multicomponent alloy systems. The yield strength, Meyer exponent and the indentation impressions of these bulk alloys have also been compared.
Journal of Alloys and Compounds
Materials Engineering not elsewhere classified