Surface layer properties of ultrasonic impact-treated AA7075 aluminum alloy

KAHRAMAN F.

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE, cilt.232, sa.12, ss.2218-2225, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 232 Sayı: 12
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1177/0954405416685386
  • Dergi Adı: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2218-2225
  • Anahtar Kelimeler: Ultrasonic impact treatment, plastic deformation, nanocrystallization, AA7075, grain refinement, SEVERE PLASTIC-DEFORMATION, PEENING TREATMENT, FATIGUE-STRENGTH, RESIDUAL-STRESS, WELDED-JOINTS, TREATMENT UIT, BEHAVIOR, NANOCRYSTALLIZATION, MECHANISM, STEEL
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

In this work, surface layer properties of AA7075 aluminum alloys' ultrasonic impact peened at different treatment times are investigated. Three different layers were found on the ultrasonic impact-treated surface of AA7075 aluminum alloys. The thicknesses of the layers increase with an increase in the treatment time or deformation amount. X-ray diffraction patterns indicate that the treated surfaces have no different phases from base material and are in the face-centered cubic phase. The highest hardness values of all treated AA7075 aluminum alloys were determined in nanocrystallization layer, which is the top layer of the surface because of the grain refinement and work hardening. A sharp increase at the residual stresses occurs, increasing the deformation time and amount because of the surface enlargement.