Premium
Preparation and Properties of Alumina/Nickel‐Cobalt Alloy Nanocomposites
Author(s) -
Oh SungTag,
Sando Mutsuo,
Niihara Koichi
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02729.x
Subject(s) - materials science , alloy , cobalt , nanocomposite , nickel , hot pressing , metallurgy , composite number , composite material , intergranular corrosion
High‐density nickel‐cobalt alloy‐dispersed Al 2 O 3 (Al 2 O 3 /Ni‐Co alloy) composites were obtained via the hydrogen reduction and hot pressing of Al 2 O 3 , Ni(NO 3 ) 2 6H 2 O, and Co(NO 3 ) 2 6H 2 O powder mixtures. Microstructural investigations revealed that nanometer‐sized alloy particles were dispersed homogeneously at the matrix grain boundaries, forming the intergranular‐type nanocomposite. High strength (>1 GPa) was registered for the Al 2 O 3 /10 wt% Ni‐Co alloy composite. An inverse magnetostrictive response to applied stress was observed, because of the Ni‐Co alloy dispersions, which indicates promise for incorporating new functions such as stress and fracture sensing into the structural ceramics without any loss of mechanical properties.