The Al–18% Pb and Al–20% Pb alloys were processed by a rapid solidification, i.e., the spray deposition technique. The deposit in a shape of Gaussian curve, or bell-shaped deposit, was obtained at a pressure of 9 bar, nozzle-to-rotor distance of approximately 423 mm, and rotor inclination angle of 0°. From obtained spray deposits Al–18% Pb and Al–22% Pb, samples were cut down from the peripheral regions to portions 30 mm long and 20 mm thick. The samples were warm rolled at different percentages of thickness reduction, such as 0, 15, 30, 45, and 60%, at a recrystallization temperature of 0.4T m . The value T m refers to the melting point of the alloy at warmrolled condition, i.e., 575°C, which is evident from the Al–Pb phase diagram. As visible from the microstructure, Pb is equally distributed in the aluminum matrix in both spray deposit samples with up to 60% thickness reduction. With lower thickness percentage of warm-rolled specimens, the hardness values decrease in Al–18% Pb and Al–22% Pb alloys. Porosity is lower in Al–18% Pb alloy than that in Al–22% Pb alloy due to the deposition and rolling defects. The tribological tests showed that with the increase of Pb content from 18 to 22%, the wear rate increases abnormally, and the values of wear intensity and friction coefficient of the Al–22% Pb alloy are higher compared with those of the Al–18% Pb alloy.

中文翻译：

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喷射沉积和热轧Al-Pb合金在周边区域的显微组织、摩擦学性能和硬度

Al-18% Pb 和 Al-20% Pb 合金是通过快速凝固，即喷涂沉积技术加工的。在 9 bar 的压力、大约 423 mm 的喷嘴到转子距离和 0° 的转子倾角下获得高斯曲线形状或钟形沉积物的沉积物。从获得的喷涂沉积物 Al–18% Pb 和 Al–22% Pb 中，将样品从外围区域切割成 30 毫米长和 20 毫米厚的部分。在0.4T m 的再结晶温度下以不同的厚度减少百分比，例如0%、15%、30%、45%和60%对样品进行温轧。T m 值是指合金在温轧条件下的熔点，即 575°C，从 Al-Pb 相图中可以看出这一点。从微观结构可以看出，在两种喷涂沉积样品中，铅均匀分布在铝基体中，厚度减少高达 60%。随着温轧试样厚度百分比的降低，Al–18% Pb 和 Al–22% Pb 合金的硬度值降低。由于沉积和轧制缺陷，Al-18% Pb 合金的孔隙率低于 Al-22% Pb 合金。摩擦学试验表明，随着Pb含量从18%增加到22%，磨损率异常增加，Al-22% Pb合金的磨损强度和摩擦系数值高于Al-18 %铅合金。由于沉积和轧制缺陷，Al-18% Pb 合金的孔隙率低于 Al-22% Pb 合金。摩擦学试验表明，随着Pb含量从18%增加到22%，磨损率异常增加，Al-22% Pb合金的磨损强度和摩擦系数值高于Al-18 %铅合金。由于沉积和轧制缺陷，Al-18% Pb 合金的孔隙率低于 Al-22% Pb 合金。摩擦学试验表明，随着Pb含量从18%增加到22%，磨损率异常增加，Al-22% Pb合金的磨损强度和摩擦系数值高于Al-18 %铅合金。