The impact of minor additions of Ni nanoparticles on the dynamic viscosity of the liquid Sn-3.0Ag-0.5Cu alloy (SAC305; in wt%) is examined. The nanocomposite samples were prepared from commercial SAC305 powder and Ni nanopowder by cold pressing. The dynamic viscosity of the (Sn_96.5Ag_3.0Cu_0.5)_100–xNi_x alloys measured during heating and cooling exhibited a hysteresis in a temperature range up to 100 K above the melting temperature. This is supposed to be related to the structural transformations caused by dissolution of Ni nanoparticles in the liquid Sn-based matrix upon heating. The experimental values of the viscosity of the (Sn_96.5Ag_3.0Cu_0.5)_100–xNi_x alloys are in a good agreement with calculated data using thermodynamic approaches.

研究了少量添加镍纳米粒子对液态Sn-3.0Ag-0.5Cu合金（SAC305；以重量％计）的动态粘度的影响。纳米复合材料样品由商品SAC305粉末和Ni纳米粉通过冷压制备。（Sn _96.5 Ag _3.0 Cu _0.5）_100–x Ni _x合金在加热和冷却过程中测得的动态粘度在高于熔融温度100 K的温度范围内表现出滞后现象。据推测这与加热时Ni纳米颗粒溶解在液态Sn基基质中引起的结构转变有关。（Sn _96.5 Ag _3.0 Cu _0.5）_100-x Ni _x合金与使用热力学方法计算出的数据非常吻合。