Effect of Tool Rotational Speed on the Microstructures and Tensile Properties of 7075 Aluminum Alloy Via Friction Stir Process (FSP)

Ming Hsiang Ku, Fei Yi Hung, Truan Sheng Lui, Li Hui Chen

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

7075-T6 aluminum alloy plates were subject to FSP with various tool rotational speeds (1230, 1450 and 1670 rpm) followed by different heat treatments (natural aging and T4T6 treatments). The influences of tool rotational speeds and aging treatments on the microstructures and tensile properties were discussed. The experimental results showed that the tensile strength of FSPed specimens with various tool rotational speeds were close. After aging treatments, higher tool rotational speeds (1670 rpm) had an embrittlement phenomenon on the SZ due to the contribution of low element bands (LEBs) and precipitates. EPMA analysis showed that the LEBs are low element distributions, such as Zn, Mg, Cu. Decreasing the tool rotational speeds, the LEBs were not obvious and restrained the brittle behavior to improve the ductility. Compared with natural aging, after T4T6 treatments, the tensile strength of FSP specimens with all tool rotational speeds was improved obviously.

Original languageEnglish
Title of host publicationLight Metals 2012
Publisherwiley
Pages473-480
Number of pages8
ISBN (Electronic)9781118359259
ISBN (Print)9781118291399
DOIs
Publication statusPublished - 2012 May 24

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Materials Science(all)

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