The Cr-33.3 Ta and Cr-26.6 Ta-20 Ti alloys were fabricated by mechanical alloying and hotpressing sintering process.The influences of Ti addition on the microstructure and fracture toughness of TaCr

2

alloys containing Laves phase were investigated.The results indicate that the alloying element Ti preferentially occupies the Ta site in the Laves phase TaCr2.Intermetallic compounds can’t be synthesized by the blended Ta

Cr and Ti powders during the ball-milling for 25 h.The highly dense alloys were prepared from the ball-milled blended powders by the hot-pressing process at 1 350 ℃for 1 hThe Cr-33.3 Ta alloy with an addition of 20%的 Ti（in atom）can inhibit the generation of Laves phase TaCr

2

with a C14 structure.Compared to the unalloyed Cr-33.3 Ta alloy

the fracture toughness value of the Cr-26.6 Ta-20 Ti alloy is increased from 2.013 MPa·m

1/2

to 4.066 MPa·m

1/2

exhibiting desirable alloying toughening effect.Meanwhile

the Vicker’s hardness is also increased up to 11.59 GPa.