Effect of revolutionary pitch on the microhardness drop and tensile properties of friction stir processed 1050 aluminum alloy

Ssu Ta Chen, Truan Sheng Lui, Li Hui Chen

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Friction stir processed (FSPed) aluminum alloys generally exhibit good mechanical properties pertaining to the textural feature, dynamic recrystallization (DRX), aging effect and are commonly accompanied by a thermal mechanical affected zone (TMAZ), and these are important metallurgical factors which cause inhomogeneous deformation problems. Therefore, a 1050 aluminum alloy sheet was used to eliminate the aging effect on the microhardness distribution and tensile properties. From the microhardness profile, a significant data fluctuation variation and microhardness drop could be recognized as the feeding speed slowed to 1.1 mm/s. It is reasonable to suggest that this is closely related to the subtle microstructural changes of dynamic recrystallized grains which were a consequence of the friction stir process heat input. In addition, a significant {110}(001) crystal aggregation was observed in the center of SZs of O-FSPed samples, where (001) aligned closely along the processing direction (PD) while (110) aligned along the transverse direction (TD). The higher Taylor factors of the O-FSPper specimens were responsible for higher flow stress than that of the O-FSPpar specimens. One the other hand, the revolutionary pitch is an insignificant factor for tensile properties. Experimental results imply that FSP possesses great potential to improve the formability especially of cold-rolled H14 tempered sheets, as a partial modification method when a proper feeding speed is properly selected.

Original languageEnglish
Pages (from-to)1941-1948
Number of pages8
JournalMaterials Transactions
Volume50
Issue number8
DOIs
Publication statusPublished - 2009 Aug

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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