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Fabrication of(TiB/Ti)-TiAl composites with a controlled laminated architecture and enhanced mechanical properties

Journal of Materials Science & Technology 2021年第3期62卷 221-233页

作者： Hao Ding Xiping Cui Naonao Gao Yuan Sun Yuanyuan Zhang Lujun Huang Lin Geng School of Materials Science and Engineering Harbin Institute of TechnologyP.O.Box 433Harbin150001China Division of Superalloys Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The(TiB/Ti)-TiAl composites with a laminated structure composing of alternating TiB/Ti composite layers,α_(2)-Ti_(3)Al interfacial reaction layers of andγ-TiAl layers were successfully pre pared by spark plasma sintering of alternately stacked Tib_(2)/Ti powder layers and TiAl powder *** the influence of thickness ratio of Tib_(2)/Ti powder layers to TiAl powder layers on microstructure evolution and mechanical properties of the re sulting(TiB/Ti)-TiAl laminated composites were investigated *** results showed that the thickening ofα_(2)-Ti_(3)Al layers which originated from the reaction of Ti and TiAl was significantly hindered by introducing Tib_(2)particles into starting Ti *** the thickness ratio of Tib_(2)/Ti powder layers to TiAl powder layers increased,the bending fracture strength and fracture toughness at room temperature of the final(TiB/Ti)-TiAl laminated composites were remarkably improved,especially for the(TiB/Ti)-TiAl composites prepared by Tib_(2)/Ti powder layers with thickness of 800μm and TiAl powder layers with thickness of 400μm,whose fracture toughness and bending strength were up to 51.2 MPa·m^(1/2)and 1456 MPa,respectively,293%and 108%higher than that of the monolithic TiAl alloys in the present *** was attributed to the addition of high-performance network TiB/Ti composite ***,it was noteworthy that the ultimate tensile strength at 700℃of(TiB/Ti)-TiAl composites fabricated by 400μm thick Tib_(2)/Ti powder layers and 400μm thick TiAl powder layers was as high as that at 550℃of network TiB/Ti *** means the service temperature of(TiB/Ti)-TiAl laminated composites was likely raised by 150℃,meanwhile a good combination of high strength and high toughness at ambient tempe rature could be ***,the fracture mechanism of(TiB/Ti)-TiAl laminated composites was proposed.

关键词： titanium aluminide matrix composites Laminated structure High temperature properties Strengthening-toughening

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