中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 25 No. 5 May 2015 |
（1. Department of Metallurgy and Materials Engineering, Engineering Faculty,
Imam Khomeini International University, Qazvin 34149-16818, Iran;
2. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran;
3. Department of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;
4. Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran;
5. Department of Mechanical Engineering, Prince Mohammad Bin Fahd University, Al Khobar 31952, Saudi Arabia）
Abstract:Equal channel angular pressing is an effective technique to control the texture and microstructure of metals and alloys. Texture and microstructure of an Al-7075 alloy subjected to repetitive equal channel angular pressing through a 90° die were evaluated by X-ray diffractometer and orientation imaging microscopy. It is observed that processing through different routes leads to different types of textures, in both qualitative and quantitative senses. The texture calculation by Labotex software reveals that texture strengthens after the first pass and weakens by progressing ECAP process up to 4 passes. Microstructure investigations show that after 4 passes of equal channel angular pressing via routes BC and A, very fine grains with average grain size of about 700 nm and 1 μm appear, respectively, and most of the grains evolve into arrays of high angle boundaries. The effects of covering the Al-7075 billets with copper tube on texture and microstructure were also studied.
Key words: equal channel angular pressing; crystallographic texture; aluminum alloy; ultra-fine grain
