Comparative study of the compression properties of TiAl matrix composites reinforced with nano-TiB₂ and nano-Ti₅Si₃ particles

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• 作者：Shili Shu ; Bin Xing ; Feng Qiu ; Shenbao Jin ; Qichuan Jiang ; ^{jqc@jlu.edu.cn}
• 关键词：Mechanical characterization ; Ceramics ; Composites ; Intermetallics ; Hardening
• 刊名：Materials Science and Engineering: A
• 出版年：2013
• 出版时间：10 January, 2013
• 年：2013
• 卷：560
• 期：Complete
• 页码：596-600
• 全文大小：1229 K

文摘

The TiAl matrix composites reinforced with nano-TiB₂ and nano-Ti₅Si₃ particles were successfully fabricated by the in situ method of combustion synthesis and hot press consolidation. The sizes of the synthesized TiB₂ and Ti₅Si₃ particles are about 30-50 nm and 60-80 nm, respectively. The synthesized nano-TiB₂ particles could significantly enhance the ultimate compression strength () of the TiAl alloy, and the increases with the increase in the TiB₂ content. The average of the 6 vol % TiB₂/TiAl composite is 477 MPa higher than that of the TiAl alloy. The synthesized nano-Ti₅Si₃ particles could improve the strength and ductility of the TiAl alloy simultaneously, and the and fracture strain () increase first and then decrease with the increase in the Ti₅Si₃ content. The average of the 4 vol % Ti₅Si₃/TiAl composite is 171 MPa higher than that of the TiAl alloy, and the average increases from 17.3 % to 20.9 % .