当前位置: X-MOL 学术J. Mater. Process. Tech. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Microstructure, mechanical properties and corrosion resistance of A356 aluminum/AZ91D magnesium bimetal prepared by a compound casting combined with a novel Ni-Cu composite interlayer
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jmatprotec.2020.116874
Guangyu Li , Wenming Jiang , Feng Guan , Junwen Zhu , Zheng Zhang , Zitian Fan

Abstract In the present work, a novel Ni-Cu composite interlayer was prepared on the surface of A356 aluminum alloy solid insert using the chemical nickel-plating and electro-coppering technology, in order to restrain the generation of brittle phases and enhance the shear strength of A356 aluminum/AZ91D magnesium bimetal manufactured using a compound casting. The effect of the Ni-Cu composite interlayer on the microstructure, mechanical properties and corrosion resistance of the bimetal was studied. The results show that the Ni-Cu composite interlayer effectively restrained the generation of the brittle and hard Al-Mg intermetallic compounds (IMCs). The interface layer of the A356/AZ91D bimetal without Ni-Cu composite interlayer was composed of Al3Mg2, Al12Mg17, δ-Mg and Mg2Si phases, while the interfacial reactants of the A356/AZ91D bimetal with Ni-Cu composite interlayer were mainly Al3Ni, Ni (Cu), Cu (Ni), Mg2Cu and Al7Cu3Mg6 phases. With the application of the Ni-Cu composite interlayer, the thickness of the interface of the A356/AZ91D bimetal remarkably decreased from 1400 μm of the sample without Ni-Cu composite interlayer to 40 μm. The shear strength of the A356/AZ91D bimetal using Ni-Cu composite interlayer increased by 20.3 % compared with that of the bimetal without Ni-Cu composite interlayer. The fractures of the A356/AZ91D bimetals with and without Ni-Cu composite interlayers belonged to a brittle rupture mode. The breakage of the bimetal with Ni-Cu composite interlayer mainly took place between the Ni-Cu layer and AZ91D matrix, while the rupture of the A356/AZ91D bimetal without Ni-Cu composite interlayer was located in the interface layer. The Cu(Ni) and Ni(Cu) layers had a lower nano-hardness than the Al-Mg IMCs, and the elasticity modulus for the Cu(Ni), Ni(Cu) and Al3Ni phases were higher compared to those of the Al-Mg IMCs. The results of corrosion test exhibited that the Ni-Cu composite interlayer had little influence on the corrosion resistance of the A356/AZ91D bimetal.

中文翻译:

复合铸造结合新型Ni-Cu复合夹层制备A356铝/AZ91D镁双金属的显微组织、力学性能和耐腐蚀性能

摘要 本工作采用化学镀镍和电镀铜技术在A356铝合金实心刀片表面制备了一种新型Ni-Cu复合夹层,以抑制脆性相的产生,提高剪切强度。使用复合铸件制造的 A356 铝/AZ91D 镁双金属。研究了Ni-Cu复合夹层对双金属组织、力学性能和耐腐蚀性能的影响。结果表明,Ni-Cu复合夹层有效地抑制了脆硬Al-Mg金属间化合物(IMCs)的生成。无 Ni-Cu 复合夹层的 A356/AZ91D 双金属的界面层由 Al3Mg2、Al12Mg17、δ-Mg 和 Mg2Si 相组成,而具有Ni-Cu复合夹层的A356/AZ91D双金属的界面反应物主要为Al3Ni、Ni(Cu)、Cu(Ni)、Mg2Cu和Al7Cu3Mg6相。随着Ni-Cu复合夹层的应用,A356/AZ91D双金属的界面厚度从没有Ni-Cu复合夹层的样品的1400 μm显着降低到40 μm。与没有Ni-Cu复合夹层的双金属相比,使用Ni-Cu复合夹层的A356/AZ91D双金属的剪切强度提高了20.3%。有和没有Ni-Cu复合夹层的A356/AZ91D双金属的断裂属于脆性断裂模式。Ni-Cu复合夹层双金属的断裂主要发生在Ni-Cu层与AZ91D基体之间,而没有Ni-Cu复合夹层的A356/AZ91D双金属的断裂位于界面层。Cu(Ni)和Ni(Cu)层的纳米硬度低于Al-Mg IMCs,Cu(Ni)、Ni(Cu)和Al3Ni相的弹性模量高于Al -Mg IMC。腐蚀试验结果表明,Ni-Cu复合夹层对A356/AZ91D双金属的耐腐蚀性能影响不大。
更新日期:2021-02-01
down
wechat
bug