In situ synthesis and characterization of TiB2/FeMnAl metal matrix neutron absorption composites

A novel in-situ TiB2/FeMnAl metal matrix composites with different Mn content have been prepared and characterized. The effects of the Mn content on the microstructure evolution and performances were discussed. In all fabricated FeMnAl metal matrix composites, the in-situ TiB2 particles were dispersedly distributed in austenite matrix after hot rolling and annealing. Significantly, no eutectic M2B (M = Fe, Mn) boride formed along grain boundaries in all composites that shows the excellent hot workability. The tensile strength and elongation after fracture of the all composite above 20 wt% Mn are more than 750 MPa and 12 % at room temperature, respectively. The ultimate tensile strength of composites with 20 wt% Mn can maintain above 560 MPa at 500 °C. The shielding properties was also investigated by Monte Carlo method, and this designed composites are expected to be well materials for practical application.