This work investigated the effect of sintering temperatures (600–750 °C) on mechanical and tribological behaviors of nickel-aluminium bronze (NAB) alloys developed by gas atomization and spark plasma sintering. Results indicated an increase of the volume fraction of B2-type NiAl precipitates with increasing sintering temperature, leading to an improvement of the yield strength and the wear resistance. Specifically, detailed microstructural analyses of sintered NAB alloys at 750 °C showed the presence of ultrafine grains with an average size of 367 nm, nanoscale twins with a volume fraction of 11.7% and dislocations with a density of 1.3 ± 0.1 × 10¹⁴ m⁻². A much higher yield strength of 620 MPa was obtained in NAB, if compared to that of conventional cast counterparts (280–440 MPa). Estimations of strengthening mechanisms suggested the predominant mechanism of grain boundary strengthening (335 MPa) for NAB alloys with contributions from precipitate strengthening (54 MPa), dislocation strengthening (75 MPa), twin boundary strengthening (89 MPa) and solid solution strengthening (50 MPa). Moreover, dislocations was blocked at twin boundaries to form complex dislocation barriers and networks, further contributing to the high strength. The high wear resistance of NAB could be ascribed to the reduction of the local stress around crack tips due to the high elastic modulus mismatch (E_NiAl/E_Cu), and to the crack extension toughening near the interface of the matrix and the precipitate caused by the high plastic mismatch (σ_NiAl/σ_Cu).

这项工作研究了烧结温度（600–750°C）对通过气体雾化和火花等离子体烧结开发的镍铝青铜（NAB）合金的力学和摩擦学行为的影响。结果表明，随着烧结温度的升高，B2型NiAl析出物的体积分数增加，从而导致屈服强度和耐磨性的提高。具体而言，在750°C下对NAB烧结合金进行的详细显微组织分析表明，存在平均尺寸为367 nm的超细晶粒，体积分数为11.7％的纳米级孪晶以及密度为1.3±0.1×10 ¹⁴  m-的位错^{。 2个}。与传统的铸造铸件（280–440 MPa）相比，NAB的屈服强度更高，为620 MPa。强化机理的估计表明，NAB合金的晶界强化的主要机理为335 MPa，其中析出强化（54 MPa），位错强化（75 MPa），双晶界面强化（89 MPa）和固溶强化（50 MPa）的贡献）。此外，位错在两个边界处被阻挡，形成了复杂的位错壁垒和网络，从而进一步提高了强度。NAB的高耐磨性可以归因于由于高弹性模量不匹配（E _NiAl / E _Cu），以及基体的界面和（所造成的高塑性失配沉淀附近的裂纹扩展增韧σ_的NiAl / σ_的Cu）。