4.7 Article

Effect of high pressure torsion on the precipitation hardening in Al-Ca-La based eutectic alloy

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140633

关键词

Aluminum alloys; High pressure torsion; Eutectic; Atom probe tomography

资金

  1. Russian Science Foundation [18-79-00345]
  2. Ministry of Science and High Education of the Russian Federation [K1-2016-030, 211]
  3. Russian Science Foundation [18-79-00345] Funding Source: Russian Science Foundation

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The research found that high pressure torsion processing can lead to the formation of a nanocrystalline structure in the Al3Ca2La1.5Mn alloy, significantly increasing the microhardness of the alloy. After annealing treatment, the microhardness of the alloy further increases, attributed to precipitation hardening resulting from the decomposition of the calcium and manganese supersaturated aluminum solid solution.
The effect of high pressure torsion (HPT) on the structure and microhardness of Al3Ca2La1.5Mn alloy containing 13 vol% of Al-4(Ca,La) eutectic phase has been studied using electron microscopy, X-ray analysis and atom probe tomography (APT). We show that HPT causes the formation of a nanocrystalline structure resulting in a 4-fold increase in the microhardness (to 2.5 GPa) of the alloy. Post-deformation low-temperature annealing further increases the microhardness to similar to 3.1 GPa. The APT data suggest that the increase in the microhardness after annealing is caused by precipitation hardening due to the decomposition of the calcium and manganese supersaturated aluminum solid solution.

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