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Improved thermo-mechanical processing for effective grain refinement of high-strength AA 7050 Al alloy

机译：改进的热机械加工工艺可有效细化高强度AA 7050铝合金

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摘要

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 MgZn_2 particles with diameter ≥ 0.2 μm, 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.
机译：提出了一种改进的热机械加工方法（N-ITMT），以冷轧，短时间退火和连续轧制为基础，制备出细化沉淀硬化的Al-Zn-Mg-Cu合金，并给出了相应的组织演变和力学性能。被调查了。与传统的RI-ITMT相比，N-ITMT工艺可以生产出高质量的轧制板材，而没有边缘裂纹。当N-ITMT的总还原量达到85％时，N-ITMT样品的重结晶细晶粒结构与RI-ITMT的相似，并且在长时间固溶处理中表现出高稳定性。此外，N-ITMT样品的机械性能与峰值时效（T6）后的RI-ITMT几乎相同。结果表明，冷变形加上短时间的退火可以得到大量直径≥0.2μm的MgZn_2颗粒，这些颗粒可以在随后的固溶处理中充当新的重结晶晶粒的成核位点。极大地表明，RI-ITMT所使用的静态长时效可通过冷变形加喷射周期退火来代替，而短时退火后的连续轧制将有利于无裂纹的轧制板。因此，N-ITMT可以很好地替代RI-ITMT，以有效地商业生产不同的可热处理铝合金以获得细晶粒。

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  • 来源
    《Materials Science and Engineering》 |2015年第25期|86-93|共8页
  • 作者

    Wangtu Huo; Longgang Hou; Yujing Lang; Hua Cui; Linzhong Zhuang; Jishan Zhang;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District,Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District,Beijing 100083, China;

    Ningbo Branch of China Academy of Ordnance Science, Lingyun Road 199, High-tech District, Ningbo, Zhejiang 315103, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District,Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District,Beijing 100083, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Al-Zn-Mg-Cu alloys; Thermo-mechanical processing; Grain refinement; Mechanical properties;

    机译：Al-Zn-Mg-Cu合金;热机械加工;晶粒细化;机械性能;

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