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Low-cycle fatigue fracture behavior of a Mg alloy (AZ61) after alkaline Cu, alkaline followed by acidic Cu, Ni/Cu, and Cr-C/Cu electroplating

机译:Mg合金(AZ61)在碱性Cu,碱性,酸性Cu,Ni / Cu和Cr-C / Cu电镀后的低周疲劳断裂行为

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Micrometer-thick alkaline Cu-, alkaline followed by acidic Cu-, Ni/Cu- and Cr-C/Cu-coated AZ61 fatigue specimens were prepared, and their low-cycle fatigue behavior was studied. The experimental results show that the number of stress cycles to fatigue failure gradually decreased when the AZ61 specimen was electroplated with alkaline Cu or with alkaline followed by acidic Cu undercoats. Electroplating a protective Cr-C coating on Cu-coated AZ61 increases AZ61 's low-cycle fatigue resistance, although some cracks perpendicular to the applied cyclic stress developed in the as-plated Cr-C coating. The Cr-C deposition, which has a high hardness, increases the number of stress cycles for crack initiation. Conversely, electroplating a crack-free Ni deposit on the Cu-coated AZ61 decreases its low-cycle fatigue resistance. This decrease is attributed to inducing a relatively high residual tension stress after Ni electroplating. A large fracture plateau was observed from the coated AZ61 specimens with a relatively low fatigue resistance. In Cu-coated AZ61 specimens, cracking initiated in the interface between Cu and AZ61 and then propagated into the AZ61 substrate due to inducing a residual tension stress.
机译:制备了微米厚的碱性Cu-,碱性,然后是酸性Cu-,Ni / Cu和Cr-C / Cu涂层的AZ61疲劳试样,并研究了它们的低周疲劳行为。实验结果表明,当用碱性铜或碱性然后是酸性铜底涂层电镀的AZ61试样时,疲劳失效的应力循环数逐渐减少。在镀有铜的AZ61上电镀保护性Cr-C涂层可以提高AZ61的低周疲劳强度,尽管在镀Cr-C涂层中会产生一些与施加的循环应力垂直的裂纹。具有高硬度的Cr-C沉积增加了裂纹萌生的应力循环次数。相反,在镀铜的AZ61上电镀无裂纹的Ni沉积物会降低其低周疲劳强度。该降低归因于在镍电镀之后引起相对较高的残余张应力。从具有较低抗疲劳性的涂覆的AZ61样品中观察到大的断裂平台。在镀铜的AZ61试样中,由于引起残余拉应力,裂纹在Cu和AZ61之间的界面处开始,然后传播到AZ61基板中。

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