Mechanical alloying and spark plasma sintering of the intermetallic compound Ti50Al50

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

“…FAST/SPS leads to the full densification of the specimens with a finer microstructure in comparison with conventional techniques, [101] allowing dense materials with grains in the nano-scale range, as shown for Ni 3 Al, [102,103] FeAl, [104,105] and TiAl. [106][107][108] More examples of sintered intermetallic materials are reviewed by Orru et al [109] In order to increase the creep resistance at high temperature, second oxides phases are frequently added or formed in situ by mechanical alloying (oxide-dispersion-strengthening (ODS)). [110] These particles act as rigid inclusions -against the densification of the composite material -but also pinning the grain boundaries and lowering their mobilities according to the Zener model.…”

Study on solid-state reactions of nanocrystalline TiAl synthesized by mechanical alloying

“…Synthesis of TiAl intermetallic compound by MA and subsequent annealing has been previously reported [6][7][8][9]. Nevertheless, there is still some uncertainty regarding mechanism of TiAl formation.…”

Dependence of heating rate in PCAS on microstructures and high temperature deformation properties of γ-TiAl intermetallic alloys

“…In recent years, a number of attempts were made to produce g-TiAl alloys from resistance sintering, also known as spark plasma sintering (SPS) [3][4][5], pulse current hot pressing (PCHP) [6], pulse discharge sintering (PDS) [7,8], etc. In each case, sintering parameters (temperature, dwell time) dependence on resultant microstructures is often involved, while heating rate effect has not been widely explored.…”

“…In each case, sintering parameters (temperature, dwell time) dependence on resultant microstructures is often involved, while heating rate effect has not been widely explored. So far, the documented heating rate is typically as low as 1.7 C s À1 [3,6-9], 0.83 C s À1 [7], 0.5 C s À1 [4]. As a result, g-TiAl alloys with coarse (over 30 mm) fully lamellar colonies were often obtained if sintering temperature of 1200-1300 C, coarse initial powders of over 100 mm.…”