Corrosion behavior of age hardening aluminum alloys produced by high-energy ball milling
Corrosion behavior of age hardening aluminum alloys produced by high-energy ball milling
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DOI：
10.1016/j.jallcom.2021.163488
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发表时间：
2021-12-30
影响因子：
6.2
通讯作者：
Gupta, Rajeev Kumar
中科院分区：
文献类型：
--
作者：
Ozdemir, Furkan;Witharamage, Chathuranga Sandamal;Gupta, Rajeev Kumar
研究了高能球磨（HEBM）对时效硬化铝合金腐蚀性能和硬度的影响。在单轴压力为3 GPa的条件下，对预合金粉末进行HEBM处理，再进行冷压，得到纳米晶时效硬化合金（AA2024、AA6061和AA7075）。在0.6 M NaCl溶液中进行循环动电位极化和浸泡试验，结果表明HEBM合金的点蚀电位和保护电位明显高于相同成分的变形合金。x射线衍射分析和透射电镜分析表明，球磨合金在100 nm以下出现晶粒细化，这是时效硬化HEBM合金的主要强化机制。时效硬化球磨合金具有优异的耐蚀性和硬度，主要归因于纳米晶组织、较宽的固溶度和均匀的显微组织（不含粗大的金属间相）。(c) 2021 Elsevier B.V.版权所有
ABSTR A C T The influence of high energy-ball milling (HEBM) on corrosion and hardness of age hardening aluminum alloys was investigated. Nanocrystalline age hardening (AA2024, AA6061 and AA7075) alloys were pro-duced by HEBM of pre-alloyed powder and subsequent cold compaction under uniaxial pressure of 3 GPa. Cyclic potentiodynamic polarization and immersion tests were conducted in 0.6 M NaCl solution which revealed significantly increased pitting and protection potentials in the HEBM alloys compared to wrought alloys of same composition. X-ray diffraction analysis and transmission electron microscopy indicated grain refinement below 100 nm in the ball milled alloys which was the major strengthening mechanism in the age hardening HEBM alloys. The superior corrosion resistance and hardness of the age hardening ball milled alloys were attributed to nanocrystalline structure, extended solid solubility and homogenous microstructure-free from coarse intermetallic phases. (c) 2021 Elsevier B.V. All rights reserved.