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The aim in this investigation is focused on the evaluation of two distinctive powder size ratios of pure elements (Al, Si and Cu) powders. Heat treatments (T4 and T6) affecting the mechanical strengths of Al/Si/Cu composites are also investigated. The novelty concerns to pure elements to constituting the composites and no melting or stir casting route are used. It is found that the densifications and tensile strengths are similar when distinct powder size ratios are used. It is also found that T4 and T6 treatments increases and decreases the mechanical strengths, respectively. The Si content indicates a deleterious effect in mechanical behavior. The T6 aging provides θ-Al2Cu incoherent with Al matrix, and the compressive strength is decreased. This suggests that the examined Al/Cu composites (using pure powders) are potential materials considering economical and environmentally friendly aspects.