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Characterizations of electrospark deposition TA2 alloy coating on 7075 aluminum alloy surface

机译：7075铝合金表面上的电动术沉积TA2合金涂层的特写

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Electro-spark deposition (ESD) is a microwelding process that utilizes short duration of electrical pulses to deposit electrode materials to a metallic substrate. In this paper, taking TA2 bar as electrode, a deposition layer of thickness up to 40μm was built up to on 7075 aluminum alloy substrate by means of ESD. The deposition layer is metallurgical bonded to the substrate. The microstructure, phase composition, and micro-hardness of TA2 coating were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness test. The microstructure of the coating was mainy composed of TiN phase, A13Ti phase, A1N phase and Al phase. Its micro-hardness reached 295 HV0.05, about 2 times as high as that of the substrate. The hardness at the cross-section of the entire deposition layer showed a gradient distribution.
机译：电火花沉积（ESD）是一种微型电池处理，其利用短持续时间的电脉冲将电极材料沉积到金属基板上。本文采用TA2棒作为电极，通过ESD在7075铝合金基板上建立高达40μm的厚度沉积层。沉积层是冶金键合到基材上。使用扫描电子显微镜（SEM），X射线衍射（XRD）和微硬度试验研究了Ta2涂层的微观结构，相组合物和微硬度。涂层的微观结构是由锡相，13TI相，A1N相和Al相的主体组成。其微硬度达到295 HV0.05，约为基材的约2倍。整个沉积层的横截面的硬度显示出梯度分布。

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