4.7 Article

Effect of crystal orientations and precipitates on corrosion behavior of Al-Cu-Li single crystals

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ELSEVIER
DOI: 10.1016/S1003-6326(22)66065-5

关键词

aluminum alloys; single crystal; corrosion; crystal orientation; precipitates

资金

  1. National Natural Science Foundation of China [51961013]
  2. Natural Science Foundation of Jiangxi Province, China [20202ACBL214002]
  3. China Postdoctoral Science Foundation [2019M660159, 2020T130093]
  4. Postdoctoral Science Foundation of Jiangxi Province, China [2019KY25]
  5. Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology, China [JXUSTQJYX2020022]

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The effect of crystal orientations and precipitates on the corrosion behavior of Al-Cu-Li single crystals has been studied. It was found that both crystal orientations and precipitates affect the corrosion rate and corrosion resistance of the alloy.
The effect of the crystal orientations and precipitates on the corrosion behavior of Al-Cu-Li single crystals was studied by scanning electron microscopy, transmission electron microscopy, optical microscopy, immersion testing in exfoliation corrosion solution, and electrochemical testing. The results show that the corrosion rates of different orientations of the aged Al-Cu-Li alloy increase in the order of (001) < (101) < (111), which are different from those of the as-quenched alloy in the increasing order of (111) < (001) < (101). The precipitation of the T1 phase deteriorated the corrosion resistance of the Al-Cu-Li alloy, and the degree of deterioration differed in different crystal plane orientations. The severe localized corrosion of the aged alloy propagates along the crystallography and extends along the {111} Al plane in the form of corrosion bands.

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