采用搅拌摩擦加工方法在Ti-6Al-4V(TC4)钛合金表面成功制备了载银层,研究了银在载银层中形貌、分布及其对载银层力学性能的影响.结果表明:采用此方法可制备厚度700 μm左右的载银层;在载银层的表层可观察到大量平均尺寸为10 nm左右的银纳米晶,这是由于表面强烈的搅拌剪切力产生了机械纳米化现象;在载银层的次表层内析出了银颗粒,银颗粒与基体以共格或半共格界面连接,不会产生游离的银颗粒;均匀分布的银颗粒使得载银层的表面硬度比基体的提高了约30%,但对基体的弹性模量几乎没有影响.
Friction stir processing was utilized to prepare silver-loaded layer on the surface of Ti-6Al-4V (TC4) titanium alloy successfully.The morphology, distribution and influence on the mechanical properties of silver in the silver-loaded layer were studied.The results show that a silver-loaded layer of 700 μm in thickness was successfully fabricated.A large number of silver nanocrystallines with 10 nm in average diameter were observed in the top surface of silver-loaded layer due to mechanical nanocrystallization resulted from strong stirring shear force.In the sub-surface of silver-loaded layer, silver particles precipitated and formed a solid bonding with the matrix and free particles would barely appear in service.Uniformly distributed silver particles made the surface nanohardness of the silver-loaded layer about 30% higher than that of the silver-free zone, while it had little effect on the elastic modulus of the matrix.
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