【摘要】 通过镀/渗复合改性方法在5083铝合金表面原位制备出梯度复合层,利用闭合场非平衡磁控溅射离子镀在5083铝合金表面沉积厚度约为6.0μm的Ti膜,然后将镀钛5083铝合金在490℃进行等离子渗氮8 h,研究了不同渗氮气氛（微量N,N-H比为0.05∶0.3,0.2∶0.3和0.3∶0.3）对复合层组织结构和力学性能的影响。结果表明:复合层由双层结构组成,即外层TiN_0.3和靠近铝基体一侧的铝基金属化合物Al₁₈Ti₂Mg₃,不同渗氮气氛下表层TiN_0.3均出现（002）晶面择优生长,在N-H比为0.2∶0.3时,复合层的表面硬度高达880 HV,相比于未处理的基体铝合金硬度（98 HV）提高了约9倍。复合层的摩擦系数明显低于未处理态,并且磨损率显著降低。更多还原

【Abstract】 Duplex coatings were prepared on 5083 aluminum alloy surface by plasma nitriding. Firstly,Ti film with thickness of about 6. 0 μm was deposited on the surface of 5083 aluminum alloy by a closed field unbalanced magnetron sputtering equipment and then plasma nitrided at490 ℃ for 8 h,and effects of nitriding atmosphere on microstructure and mechanical properties of the coatings were investigated. The results show that the as-obtained coatings consist of two sub-layers,the outside TiN_0.3layer and the inside Al₁₈Ti₂Mg₃ layer. TiN_0.3layers exhibit preferred（002） orientation under various nitriding atomsphere. The maximum surface hardness of 880 HV is achieved at the N-H ratio of0. 2∶ 0. 3,which is about 9 times of that of the untreated substrate. The duplex coatings exhibit low friction coefficient and wear rates.更多还原