Microstructures and mechanical properties of (Ti,Cr)Al/Al2O 3 composites fabricated by reactive hot pressing from Ti, Al and Cr2O3

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[1] Zhu, Jianfeng
[2] Yang, Wenwen
[3] Wang, Fen
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Zhu, J. (zhujf@sust.edu.cn) | 1600年 / Elsevier Ltd卷 / 567期
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Titanium aluminide composites reinforced with in situ formed Al 2O3 were fabricated by a reactive hot press method; using Cr2O3; Al and Ti powders as raw materials. The effect of Cr2O3 addition on the microstructures and mechanical properties of the (Ti; Cr)Al/Al2O3 composite was characterized. The results show that the TiAl matrix is refined gradually with increasing the amount of Cr2O3. The Vickers-hardness and densities of the (Ti; Cr)Al/Al2O3 composite increase gradually with increasing Cr2O3 content. When the Cr 2O3 content is 4.47 wt.%; the compressive strength; flexural strength and fracture toughness of the composite reach the maximum values of 1032 MPa; 634 MPa and 9.78 MPa m1/2; which are substantially higher than those of the monolithic TiAl based alloy by about 18%; 78%; and; 80.5%; respectively. The increase in mechanical properties for the (Ti; Cr)Al/Al2O3 composite is due to the toughening effect arising from the combination of Cr solid solution in TiAl matrix and in situ formed Al2O3. © 2013 Elsevier B.V. All rights reserved;
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