In the present study, the effect of Al addition on microstructure evolution, mechanical properties, and wear performances of a newly developed Ni–Si-containing complex brass was studied. The results showed that with increasing Al content from 0 to 3 wt%, the corresponding strengthening phase evolves from δ-Ni2Si to [Ni(Al)]2Si phases. Simultaneously, it is of great interest that the increasing Al addition also brings about a remarkable change in morphology of the secondary strengthening phase from dendrite and thin rod to regular block. Additionally, the hardness, yield strength and tensile strength of complex brass effectively increase with increasing Al content, and the fracture mechanism transforms from cleavage failure and microvoids accumulation fracture to cleavage failure. It was also found that the brass with adding 3 wt% Al exhibits the solidification microstructure with the uniform distribution of the block-shaped strengthening phase and has the best wear resistance. This present study provides a potential strategy for further improving the comprehensive performance of existing complex brass.

在本研究中，研究了铝的添加对新开发的含Ni-Si的复杂黄铜的组织演变，力学性能和磨损性能的影响。结果表明，与Al含量增加为0〜3重量％，δ-Ni系对应的强化相演变2 Si与[镍（Al）的] 2硅相。同时，铝含量的增加也引起了从枝晶和细棒到规则块的二次强化相形态的显着变化，这引起了极大的兴趣。另外，随着Al含量的增加，复合黄铜的硬度，屈服强度和抗拉强度得到有效提高，断裂机理由解理破坏和微孔累积破坏转变为解理破坏。还发现，添加3重量％的Al的黄铜显示出具有块状强化相的均匀分布的凝固组织，并且具有最佳的耐磨性。本研究为进一步改善现有复杂黄铜的综合性能提供了一种潜在的策略。