Features of high-temperature synthesis in mechanoactivated gamma-irradiated mixtures of triple systems Ti-Al-C and Ti-Al-Nb

Effects of gamma-irradiation on the process of SHS of mechanoactivated mixtures Ti-Al-C and Ti-Al-Nb were studied. Mechanical activation was performed for 7 minutes in planetary ball mill at energy intensity 40 g. SHS was initiated by induction heating with varying time of annealing. Gamma-irradiation was performed on 60Co isotope to absorbed dose 3·104 Gy. Structural parameters of cells of components were calculated. Gamma-irradiation affects components of triple systems in different ways, leading to unsystematic changes in elementary cells. After SHS in powder mixture 80% Ti + 12% Al + 8% C without gamma-irradiation, it was found that product contains Ti2AlC, Ti3AlC2, TiC and unreacted C. Irradiated mixture react fully - diffractogram identifies Ti2AlC, Ti3AlC2 and TiC. Annealing for 2 minutes produces a product with dominant Ti2AlC. SHS in mixture 45% Ti + 12% Al + 43% Nb revealed that product consists of Ti2AlNb, B2-phase, α2-phase and residual Nb and Ti. During synthesis in irradiated mixture without annealing, diffractograms show decrease in level of diffuse background and increase in values of reflection intensities, structural state of products is stabilized. Effect of gamma-irradiation contributes to growth of phases and stabilization of structure synthesized product.

[1]  B. Tolochko,et al.  Synchrotron in situ studies of mechanical activation treatment and γ-radiation impact on structural-phase transitions and high-temperature synthesis parameters during the formation of γ-(TiAl) compound. , 2019, Journal of synchrotron radiation.

[2]  M. Loginova,et al.  X-Ray Diffraction Analysis of the Influence of the Absorbed γ-Irradiation Dose on Ti3Al Structural Characteristics , 2018, Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques.

[3]  M. Loginova,et al.  Formation of structural states in mechanically activated powder mixtures Ti + Al exposed to gamma irradiation , 2018 .

[4]  M. Loginova,et al.  Stimulation of processes of self-propagating high temperature synthesis in system Ti + Al at low temperatures by influence of γ-quanta , 2018 .

[5]  M. Loginova,et al.  The evolution of structural and phase states of titanium aluminides after γ irradiation in small doses , 2017, Physics of Metals and Metallography.

[6]  E. Levashov,et al.  Effect of Mechanical Activation on Ti3AlC2 Max Phase Formation under Self-Propagating High-Temperature Synthesis , 2015 .

[7]  Xiaomeng Zhu,et al.  Combustion synthesis of NiAl/Al2O3 composites by induction heating , 2010 .

[8]  L. Pambaguian,et al.  Synthesis of γ-TiAl by thermal explosion + compaction route: Effect of process parameters and post-combustion treatment on product microstructure , 2010 .

[9]  K. Naplocha,et al.  Combustion synthesis of Al–Cr preforms activated in microwave field , 2009 .

[10]  Yuyong Chen,et al.  Effects of yttrium on microstructures and properties of Ti-17Al-27Nb alloy , 2006 .

[11]  A. Rosenberger,et al.  The influence of high temperature exposure on the mechanical performance of a γ titanium aluminide alloy , 2002 .

[12]  Chang-an Wang,et al.  Preparation of Ti3AlC2 and Ti2AlC by self-propagating high-temperature synthesis , 2001 .

[13]  V. G. Abramov,et al.  Thermal Explosion of Explosives and Propellants. A review , 1981 .