钛合金表面柔性电极电火花强化层的组织与性能

摘要

By a revolving flexible copper electrode, titanium alloy surface was strengthening treated in air.The strengthening layer was researched by SEM, XRD, hardness tester and surface roughness tester.The results show that the titanium alloy strengthened layer consisted of oxides (TiO, etc) and intermetallic compounds (CuTi,Zn2TiO4, Cu4Ti3, etc).The thickness of the strengthened layer was 13-110 μm and increased with increasing the current density.Grains in the strengthened layer were refined and even nano-crystalline formed.Compared to the matrix hardness the surface hardness increased by 195％ to 266％, and increased with increasing the discharge energy density.Surface strengthening treatment had little effect on surface roughness of the titanium alloy.%采用旋转的柔性铜电极在空气中对钛合金表面进行强化处理,并采用SEM、XRD、硬度计、表面粗糙度仪等对强化层进行了研究.结果表明:试验条件下,钛合金强化层由氧化物(TiO等)和金属间化合物(CuTi、Zn2TiO4、Cu4Ti3等)组成,厚度达到13～110μm,且随电流密度的增大而增厚;强化层晶粒得到细化,甚至产生了纳米晶;表面硬度相对基体提高195%～266%,且表面硬度随放电能量密度的增大而提高;表面强化处理对钛合金表面粗糙度影响较小.