Reactive hot pressing and mechanical properties of TiAl3/Ti3AlC2/Al2O3 in situ composite

Dense TiAl3/Ti3AlC2/Al2O3 composites were synthesised from Al, TiO2 and TiC powder mixtures at 1250 C and 50 MPa for 10 min using an in-situ reaction/hot-pressing method. The reaction kinetics, microstructure, mechanical properties and toughening mechanism of the fabricated composites were investiga...

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Published inMaterials in engineering Vol. 49; pp. 929 - 934
Main Authors Chen, Weiping, Xiao, Huaqiang, Fu, Zhiqiang, Fang, Sicong, Zhu, Dezhi
Format Journal Article
LanguageEnglish
Published 01.08.2013
Subjects
Aluminum
Aluminum oxide
Intermetallic compounds
Intermetallics
Microstructure
Molecular composites
Particulate composites
Titanium aluminides
Titanium carbide
Titanium dioxide
Toughening
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Abstract Dense TiAl3/Ti3AlC2/Al2O3 composites were synthesised from Al, TiO2 and TiC powder mixtures at 1250 C and 50 MPa for 10 min using an in-situ reaction/hot-pressing method. The reaction kinetics, microstructure, mechanical properties and toughening mechanism of the fabricated composites were investigated. TiO was a transitional phase, and a reaction path for the Al/TiO2/TiC system was proposed. The composites achieved Vickers hardness, three-point bending strength and fracture toughness values of about 8.4 GPa, about 658.9 MPa and about 7.9 MPa.m1/2, respectively. Analysis of microstructure/crack propagation path interaction revealed that crack deflection, crack bridging, and Ti3AlC2 particle pullout were the main mechanisms responsible for toughening. The compressive strength of the in-situ composites was much higher than that of as-cast TiAl3 and was maintained even at 1000 C due to the cooperative strengthening introduced by Ti3AlC2 and Al2O3.
AbstractList Dense TiAl3/Ti3AlC2/Al2O3 composite was synthesized from Al, TiO2 and TiC powder mixture at 1250 degree C and 50MPa for 10min using an in situ reaction/hot-pressing method. The reaction kinetic, microstructure, mechanical properties and toughening mechanism of the fabricated composite were investigated. TiO was found to be the transitional phase, and the reaction path for the Al/TiO2/TiC system was proposed. The composite achieved Vickers Hardness, three-point bending strength and fracture toughness of 8.4GPa, 658.9MPa and 7.9MPa/m1/2, respectively. Analysis of microstructure/crack propagation paths interaction revealed that crack deflection, crack bridging, and pull-out of the Ti3AlC2 particles were the main mechanism responsible for the toughening. The compressive strength of the in situ composite was much higher than that of as-cast TiAl3 and could be maintained even at 1000 degree C. This was mainly attributed to the cooperative strengthening introduced by Ti3AlC2 and Al2O3.
Dense TiAl3/Ti3AlC2/Al2O3 composites were synthesised from Al, TiO2 and TiC powder mixtures at 1250 C and 50 MPa for 10 min using an in-situ reaction/hot-pressing method. The reaction kinetics, microstructure, mechanical properties and toughening mechanism of the fabricated composites were investigated. TiO was a transitional phase, and a reaction path for the Al/TiO2/TiC system was proposed. The composites achieved Vickers hardness, three-point bending strength and fracture toughness values of about 8.4 GPa, about 658.9 MPa and about 7.9 MPa.m1/2, respectively. Analysis of microstructure/crack propagation path interaction revealed that crack deflection, crack bridging, and Ti3AlC2 particle pullout were the main mechanisms responsible for toughening. The compressive strength of the in-situ composites was much higher than that of as-cast TiAl3 and was maintained even at 1000 C due to the cooperative strengthening introduced by Ti3AlC2 and Al2O3.
Author Chen, Weiping
Fu, Zhiqiang
Zhu, Dezhi
Fang, Sicong
Xiao, Huaqiang
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Snippet Dense TiAl3/Ti3AlC2/Al2O3 composites were synthesised from Al, TiO2 and TiC powder mixtures at 1250 C and 50 MPa for 10 min using an in-situ...
Dense TiAl3/Ti3AlC2/Al2O3 composite was synthesized from Al, TiO2 and TiC powder mixture at 1250 degree C and 50MPa for 10min using an in situ...
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SubjectTerms Aluminum
Aluminum oxide
Intermetallic compounds
Intermetallics
Microstructure
Molecular composites
Particulate composites
Titanium aluminides
Titanium carbide
Titanium dioxide
Toughening
Title Reactive hot pressing and mechanical properties of TiAl3/Ti3AlC2/Al2O3 in situ composite
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