<p>This paper proposes a one-step method for preparing Be-Al alloys, by means of Al addition during the magnesiothermic reduction of BeF₂. The influence of temperature and the addition amount of Al/Mg on the extraction rate of Be, the chemical composition, and microstructural characteristics of the Be-Al alloy products have been investigated. When the magnesiothermic reduction temperature was 850&#xa0;°C and the amount of Mg addition was 78&#xa0;mol% of BeF₂, the Be extraction rate reached the maximum, which was 71.7%. Controlling the magnesiothermic reduction temperature above 850&#xa0;°C was conducive to weakening the dendrite structure of Be and reducing the grain size. Part of the residual Mg was dissolved in the Al phase, which was beneficial for improving the hardness of the Al matrix. The other part formed solid solutions with Al, Si, Mg₂Si, Al₃Mg₂, or Al₁₂Mg₁₇ and precipitated in the form of second phases. Nano-indentation experiments were conducted on various phases of the Be-Al alloys with different Be concentrations, and the results show that the Young’s modulus and hardness of the Mg-enriched second phase were higher than those of the Al matrix, and that the hardness of the Al phase of Be-Al alloy prepared by this method was significantly increased.</p>