微細亜結晶粒組織の７４７５系アルミニウム合金板材の機械的性質
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概要
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In an attempt to refine the grain structure of 200 mm wide sheets of the 7475 based aluminum alloy including Zr, a new warm rolling method under the control of both roll temperature and material temperature was used. The warm rolled sheet as solution-heat treated had a subgrain structure through the thickness with a high proportion of low angle boundary less than 15°. The average subgrain diameter was approximately 3 μm. The strength of the warm rolled sheet in T6 condition was about 10% higher than that of a conventional 7475 alloy sheet produced by cold rolling. As the most remarkable point, a high Lankford value (plastic strain ratio of width to thickness) of 3.5 was observed in the orientation of 45° to rolling direction, with the average Lankford value of 2.2. It was thought that the high Lankford value should be brought by well developed β–fiber, especially with the strong {011}<211> brass component. The warm rolled sheet also had a good resistance to SCC. From Kikuchi lines analysis and TEM images, it was found that PFZ was hardly formed along the low angle boundaries of the warm rolled sheet in T6 condition. This should be a factor to lead the improved resistance to SCC because of reducing the difference in electrochemical property between the grain boundary areas and the grain interior.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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