Effect of strain rate on the compression behavior of TiAl and TiAl–2Mn alloys fabricated by combustion synthesis and hot press consolidation

Compression tests of the TiAl and TiAl–2Mn alloys have been performed in the strain rate range from 1 × 10−5 s−1 to 1 × 10−2 s−1, and the effect of strain rate on the compression properties and work-hardening behavior of the two alloys have been investigated. Under any strain rate, the ultimate compression strength ( σ true UCS ) and the fracture strain ( ε true f ) of the TiAl–2Mn alloy are better than those of the TiAl alloy, while the work-hardening capacity (Hc) of the TiAl–2Mn alloy is lower than that of the TiAl alloy. The yield strength ( σ true y ) and Hc of the two alloys are strain rate sensitive, while the σ true UCS and ε true f are insensitive to the strain rate. With the increase in the strain rate, the σ true y increases, while the Hc decreases.