Open AccessThe evaluation of microstructure, grain boundary character and micro texture of [Al/Si3N4/Al2O3] P nanocomposites fabricated through PM route and its influence on compressive and three-body wear properties
Author(s) -
Pradeep Kothiyal,
Amit Joshi,
K. K. S. Mer,
Raviraj Verma
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ac406b
Subject(s) - materials science , microstructure , grain boundary , texture (cosmology) , composite material , nanocomposite , electron backscatter diffraction , metallurgy , image (mathematics) , artificial intelligence , computer science
The compressive properties and 3 body wear characteristics of powder metallurgical (PM) processed [Al/Si 3 N 4 /Al 2 O 3 ] P Nanocomposites with single and combined reinforcement of Al 2 O 3 and Si 3 N 4 reinforcing particles having different compositions (1%, 2% and 3%) were studied and evolution of microstructure, grain boundary character and micro texture of fabricated [Al/Si 3 N 4 /Al 2 O 3 ] P Nanocomposites was investigated through EBSD in the present research work. The fraction of high angle boundaries (HAGBs) were observed more in combined reinforcing samples of Al 2 O 3 and Si 3 N 4 whereas a single reinforcing sample of Al 2 O 3 and Si 3 N 4 showed fewer HAGBs. Micro texture results showed the strong textures components near to {112}〈111 〉 Cu and {110}〈111 for pure sintered Al sample P and mixed reinforcement composites (M 1 , M 2 and M 3 ) > P whereas for single reinforcing sample showed weak textures near to transverse direction. Out of all fabricated composites, 2% mixed Al 2 O 3 and Si 3 N 4 reinforced composite revealed the maximum ultimate compressive strength (209.98 MPa) and least wear rate (0.1 mm 3 /min mm 3 /N-cm for 1 kg load and 3.5 mm 3 /N-cm for 2 kg load) attributing formation of nanocluster causing grain boundary pinning effect. The dominant failure mechanism for all samples was also detected and found to be a mixed-mode ductile failure mechanism for 2% mixed Al 2 O 3 and Si 3 N 4 reinforcement composite while other sample failed through ductile as well as mixed-mode mechanisms.