Nucleation and growth of the Fe2AlB2 MAB phase in the combustion wave of mechanically activated Fe–Al–B reaction mixtures

Potanin, A.Yu; Bashkirov, E.A.; Levashov, E.A.; Loginov, P.A.; Berezin, M.A.; Kovalev, D.Yu

doi:10.1016/j.ceramint.2023.09.113

Cited by 2 publications

(3 citation statements)

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“…The reagents were mixed in an argon atmosphere using two types of mills in order to form MoAlB: A rotary ball mill (BM). Mixing was performed for 8 h at a jar rotational speed of 100 rpm; A high-speed planetary ball mill (PBM) “Activator-2SL” (Chemical Engineering Plant Ltd., Novosibirsk, Russia) [ 40 , 41 ]. Mixing was performed for 5 min at a jar rotational speed of 700 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…A high-speed planetary ball mill (PBM) “Activator-2SL” (Chemical Engineering Plant Ltd., Novosibirsk, Russia) [ 40 , 41 ]. Mixing was performed for 5 min at a jar rotational speed of 700 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…A preliminary mechanical activation (MA) of the reaction mixture was performed to enhance the degree of conversion, the structural and phase homogeneity of combustion products, and, consequently, the content of various ternary compounds, including the MAX and MAB phases [ 38 , 39 , 40 , 41 , 42 ]. Due to the extensive plastic deformation processes, MA significantly reduces the heterogeneity of the reaction mixture, and energy is accumulated in structural defects in the reactants [ 43 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

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Phase Formation during the Synthesis of the MAB Phase from Mo-Al-B Mixtures in the Thermal Explosion Mode

Potanin,

Bashkirov,

Kovalev

et al. 2024

Materials

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This work focused on the production of the MoAlB MAB phase through self-propagating, high-temperature synthesis in the thermal explosion mode. The influence of the method of a Mo-Al-B-powder reaction mixture preparation on the combustion temperature, mechanism, and stages of the MAB phase formation in the combustion process was investigated. The combustion temperatures of the mixtures obtained in the rotary ball mill and high-speed planetary ball mill were 1234 and 992 °C, respectively. The formation of intermediate compounds Mo3Al8 and α-MoB in the combustion front, along with MoAlB, was established using the time-resolved X-ray diffraction method. In the case of the mixture prepared in a ball mill, the primary interaction in the combustion front occurred through the Al melt, and in the case of using a planetary mill, solid-phase reactions played an important role. The mechanical activation of the mixture in a planetary mill also accelerated the processes of phase formation. The method of a reaction mixture preparation has virtually no effect on the MoAlB MAB phase content in combustion products (92–94%), but it does affect their structure. The synthesis products have a lamellar structure composed of MAB grains with a thickness of ~0.4 μm and a length of ~2–10 μm.

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