Synthesis, microstructure and properties of (Ti_1−x, Mo_x)₂AlC phases

ABSTRACT

The reaction path of the (Ti_0.9, Mo_0.1)₂AlC phase from Ti, Al, TiC and Mo powder mixtures was investigated in detail ranging from 500 to 1450°C, and the results show that the reaction between Ti and Al produced Ti–Al intermetallics, and the reaction between Al and Mo formed Mo–Al intermetallics. And then the (Ti_0.9, Mo_0.1)₂AlC phase was formed by the reaction of Ti–Al, Mo–Al intermetallics, and TiC. At 1350°C for 2 h, a dense (Ti_0.9, Mo_0.1)₂AlC phase with purity was successfully fabricated. The Vickers hardness, flexural strength and fracture toughness were 5.48 GPa, 363.60 MPa and 5.78 MPa m^1/2, which were improved by 44, 34 and 136% for (Ti_0.80, Mo_0.20)₂AlC, respectively, compared with the single-phase Ti₂AlC.

KEYWORDS:

• (Ti_1−xMo_x)₂AlC
• solid solution
• mechanical properties

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China : [Grant Number 51171096, 51142009]; the Provincial Predominant Discipline Fund of Xi’an Shiyou University of Materials Science and Engineering Xi’an Shiyou University of Materials Science and Engineering; the Natural Science Foundation of Shaanxi Province, China : [Grant Number 2010JM6014].