激光预沉淀对深冷处理Al-Zn-Mg-Cu合金耐腐蚀性能的影响

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Metallurgical Research & Technology Pub Date : 2022-01-01 DOI:10.1051/metal/2022009

Siyi Ma, Ruiming Su, Kaining Wang, Lei Wang, Y. Qu, Rong-de Li

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引用次数: 1

摘要

对新研制的AA7075进行了固溶、高温激光表面处理、深冷处理和人工时效处理。研究了微观组织演变和析出行为，并分析了它们对腐蚀行为的影响。结果表明:高温激光表面处理后，粗η相消失，形成大量小η相;在固溶过程中大部分相溶入Al基体，激光处理时析出细小的η相。高温激光表面处理样品中出现η′相。深冷处理中Mg元素析出。结果表明:热处理过程中，AA7075的析出顺序为固溶体→GPI区→亚稳η′→稳定η。合理的激光扫描功率具有最佳的耐腐蚀性。当激光功率为1000 W时，由于晶界析出物的粗化和分离，样品具有较好的耐蚀性。

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Influence of laser pre-precipitation on the corrosion resistance of Al-Zn-Mg-Cu alloy with deep cryogenic treatment

A recently developed AA7075 was subjected to solid solution, high temperature laser surface treatment, deep cryogenic treatment, and artificial aging. The microstructure evolution and precipitation behavior were examined, and their effects on corrosion behaviour were analyzed. The results showed that coarse η phases disappeared and a large number of smaller η phases were formed after high temperature laser surface treatment. Most of the phases dissolved into Al matrix during solution and fine η phases precipitated in laser treatment. η′ phases appeared in the high temperature laser surface treatment samples. Mg element precipitated in deep cryogenic treatment. It was concluded that the precipitation of AA7075 during heat treatment followed the sequence of solid solution → GPI (Guinier Preston) zones → metastable η′ → stable η. Reasonable laser scanning power owned the best corrosion resistance. The reasonable sample which the laser power was 1000 W showed much better corrosion resistance due to the coarsening and separation of grain boundary precipitations.

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来源期刊

Metallurgical Research & Technology METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.70

自引率

9.10%

发文量

审稿时长

4.4 months

期刊介绍： Metallurgical Research and Technology (MRT) is a peer-reviewed bi-monthly journal publishing original high-quality research papers in areas ranging from process metallurgy to metal product properties and applications of ferrous and non-ferrous metals and alloys, including light-metals. It covers also the materials involved in the metal processing as ores, refractories and slags. The journal is listed in the citation index Web of Science and has an Impact Factor. It is highly concerned by the technological innovation as a support of the metallurgical industry at a time when it has to tackle severe challenges like energy, raw materials, sustainability, environment... Strengthening and enhancing the dialogue between science and industry is at the heart of the scope of MRT. This is why it welcomes manuscripts focusing on industrial practice, as well as basic metallurgical knowledge or review articles.