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Phase Constitution and Dynamic Properties of Spark Plasma‐Sintered Alumina–Titanium Composites
Author(s) -
Hayun Shmuel,
Meir Shai,
Kalabukhov Sergey,
Frage Nahum,
Zaretsky Eugene
Publication year - 2016
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/jace.13992
Subject(s) - materials science , titanium , spark plasma sintering , composite material , intermetallic , phase (matter) , ceramic , microstructure , aluminium , dissolution , metallurgy , chemical engineering , chemistry , organic chemistry , alloy , engineering
Al 2 O 3 /Ti composites of various metal to ceramic ratios were fabricated by the spark plasma sintering ( SPS ) technique. The effects of titanium concentration in the initial mixture on phase composition, and on the static and dynamic (planar impact testing) mechanical properties of the SPS ‐processed composites were investigated. It was observed that the significant alumina dissolution in titanium takes place during SPS treatment. The composites fabricated from starting alumina/titanium powder mixtures with a mass fraction of titanium less than 0.8 consisted of two phases, alumina and a solid solution of oxygen and aluminum in titanium. For starting mixtures with higher titanium content, the presence of a Ti 3 Al intermetallic phase with a relatively low fraction of dissolved oxygen was detected. Changes in phase composition could explain the effect of titanium content in the starting mixture on physical and mechanical properties of the composites. Mechanisms governing the dynamic response of the composites under loading of different intensities are discussed.