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Characterization of AA7075/AA5356 gradient transition zone in an electron beam wire-feed additive manufactured sample
Materials Characterization ( IF 4.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.matchar.2020.110867
V. Utyaganova , A. Filippov , S. Tarasov , N. Shamarin , D. Gurianov , A. Vorontsov , A. Chumaevskii , S. Fortuna , N. Savchenko , V. Rubtsov , E. Kolubaev

A transition zone formed using electron beam wide-feed additive deposition of AA5356 on a AA7075 substrate was investigated for microstructure, composition, tensile strength microhardness and chemical corrosion resistance. The chemical composition of the transition zone was characterized by incrementally increasing content of Mg and decreasing contents of Cu and Zn. Microstructurally there was a transition from thick intergrain intermetallic network to uniformly distributed intermetallic particles. Phase composition of the zone was represented by coarse and fine Al-Mg-Cu-Zn particles, as well as FeAl ones and Mg2Si composite particles located at the columnar grain boundaries. Microhardness and tensile strength of this zone were higher than those of pure AA5356 deposited metal. Severe intergranular corrosion was observed on the surface of the transition zone. The intensity of corrosion inversely correlated with the Mg content.



中文翻译:

电子束送丝添加剂制造的样品中AA7075 / AA5356梯度过渡区的表征

研究了在AA7075基板上使用AA5356的电子束宽进给添加剂沉积形成的过渡区的微观结构,组成,拉伸强度,显微硬度和耐化学腐蚀性能。过渡区的化学成分的特征是镁的含量逐渐增加,而铜和锌的含量逐渐减少。在微观结构上,从厚的晶粒间金属间网络过渡到均匀分布的金属间颗粒。Al-Mg-Cu-Zn细颗粒,FeAl颗粒和Mg 2颗粒代表区域的相组成硅复合颗粒位于柱状晶界。该区域的显微硬度和抗拉强度高于纯AA5356沉积金属的显微硬度和抗拉强度。在过渡区的表面观察到严重的晶间腐蚀。腐蚀强度与镁含量成反比。

更新日期:2021-01-07
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