期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.071
关键词
Al-Zn-Mg-Cu alloys; Thermo-mechanical processing; Grain refinement; Mechanical properties
类别
资金
- Fundamental Research Funds for the Central Universities [FRF-TD-12-001]
- National 863 Project [2013AA032403]
- Constructed Project for Key Laboratory of Beijing [FRF-SD-13-005B]
- State Key Laboratory for Advanced Metals and Materials of China [2014Z-21]
An improved thermo-mechanical processing (N-ITMT) was proposed for manufacturing fine-grained precipitation-hardening Al-Zn-Mg-Cu alloy based on cold rolling, short-period annealing and continuous rolling, and the corresponding microstructure evolution and mechanical properties were investigated. The N-ITMT processing can produce high-quality rolling sheets without edge cracks compared with the traditional RI-ITMT. The recrystallized fine-grained structures of N-ITMT samples are similar to those of RI-ITMT when the total reduction of N-ITMT reached 85% and exhibited high stability during long-period solution treatment. Moreover, the mechanical properties of N-ITMT samples are almost the same as those of RI-ITMT after peak aging (T6). It shows that cold deformation plus short-period annealing can acquire large quantities of MgZn2 particles with diameter >= 0.2 mu m, which can perform as nucleation sites for new recrystallized grains during subsequent solution treatment. It is greatly indicated that the static long-period overaging used by RI-ITMT can be replaced by cold deformation plus shot-period annealing, and the continuous rolling after short-period annealing would benefit the crack-free rolling sheets. Thus, N-ITMT would be a good alternative to RI-ITMT for efficient commercial production of different heat-treatable Al alloys to acquire fine grains. (C) 2014 Elsevier B.V. All rights reserved.
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