Fabrication of dense ultrafine TiAl alloys by spark plasma synthesis from mechanically activiated powders

Li Xia; Hui Ding; Yuxiang Shi; Yaoyao Ren

doi:10.1007/s11595-006-3408-4

Journal of Wuhan University of Technology Materials Science Edition ›› 2007, Vol. 22 ›› Issue (3) : 408 -411. DOI: 10.1007/s11595-006-3408-4

Article

Fabrication of dense ultrafine TiAl alloys by spark plasma synthesis from mechanically activiated powders

Li Xia ¹^,^{^{^a}}
, Hui Ding ¹
, Yuxiang Shi ¹
, Yaoyao Ren ²

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Abstract

Powder of Ti-46at%Al alloy was synthesized through mechanical activation(MA) and then sintered and concurrently consolidated in a short sintering time of 900 s by using a spark plasma sintering(SPS) process. The XRD and SEM profiles show that the microstructures of TiAl alloys contained γ TiAl and small amount α-2 Ti₃Al phase, whose amount can be controlled by the sintering temperature. The compacts retained the original fine-grained fully densified bodies by avoiding an excessively high sintering temperature. The alloys sintered at higher temperature with this process showed a coarser microstructure. So it is possible to produce dense nanostructured TiAl alloys by mechanically activated spark plasma sintering (MASPS) within a very short period of time.

Keywords

titanium aluminides / mechanical activation / spark plasma sintering (SPS)

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Li Xia, Hui Ding, Yuxiang Shi, Yaoyao Ren. Fabrication of dense ultrafine TiAl alloys by spark plasma synthesis from mechanically activiated powders. Journal of Wuhan University of Technology Materials Science Edition, 2007, 22(3): 408-411 DOI:10.1007/s11595-006-3408-4

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