镍铝化物增强摩擦堆焊Al-Cu-Mg合金基复合涂层的非等温时效行为

Non-isothermal aging behavior of a friction-surfaced Al-Cu-Mg alloy matrix composite coating reinforced by nickel-aluminide

本文研究了镍铝化物对Al-Cu-Mg合金非等温时效行为的影响。对经非等温时效处理的含镍铝化物Al-Cu-Mg合金的组织、力学性能和耐蚀性进行了评价。结果表明,在Al-Cu-Mg基体中加入1.5 wt%Ni后,Al-Cu-Mg基体中镍铝化物的存在使析出物由S-Al_(2)CuMg转变为θ-Al_(2)Cu。在非等温时效过程中,达到最大力学性能的非等温时效处理温度由250℃转变为300℃。与170℃等温人工时效处理相比,经非等温时效处理的含镍铝化物Al-Cu-Mg合金的最大硬度和力学性能均提高了9%。含镍铝化物试样在300℃时达到最大硬度和抗剪强度,分别为HV0.1(143.4±6.4)和(298.6±9.6)MPa。非等温时效处理后,与AA2024铝合金基体和不含镍铝化物涂层相比,含镍涂层的腐蚀电流强度分别降低了约58%和49%。与传统的人工时效处理相比,经非等温时效处理的含镍铝涂层的腐蚀电流降低了16.7%。

This study investigates the effect of nickel-aluminide on Al-Cu-Mg alloys’non-isothermal aging behavior.The microstructure,mechanical properties,and corrosion resistance of nickel-aluminide-containing Al-Cu-Mg alloys were evaluated after non-isothermal aging treatment.The results show that the presence of nickel aluminide in the Al-Cu-Mg alloy changes the nature of S-Al_(2)CuMg precipitates toθ-Al_(2)Cu precipitates by adding 1.5 wt%Ni to the Al-Cu-Mg matrix.The non-isothermal aging treatment temperature for achieving the maximum mechanical properties during non-isothermal aging shifted from 250℃to 300℃.Compared to isothermal artificial aging treatment at 170℃,the maximum hardness and mechanical properties increased by up to 9%in a nickel-aluminide containing Al-Cu-Mg alloy after non-isothermal aging treatment.The nickel-aluminide containing sample’s maximum hardness and shear strength is HV0.1(143.4±6.4)and(298.6±9.6)MPa,respectively occurring at 300℃.After non-isothermal aging treatment,the corrosion current intensity was reduced by approximately 58%and 49%in the nickel-containing coating compared to the AA2024 aluminum alloy substrate and coating without nickel-aluminide,respectively.Compared with the conventional artificial aging treatment,the corrosion current decreased by 16.7%more after non-isothermal aging treatment in the nickel-aluminide-containing coating.