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Al-6Mg-0.8Zn-0.5Mn-0.2Zr-0.2Er合金高強耐損傷工藝與微觀組織研究
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北京工業(yè)大學,北京工業(yè)大學

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國家重點基礎研究發(fā)展計劃（973計劃）;國家自然科學基金項目（面上項目，重點項目，重大項目）


The investigation on the process and microstructure with high strength and high damage tolerance in Al-6Mg-0.8Zn-0.5Mn-0.2Zr-
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Beijing University of Technology,Beijing University of Technology

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    摘要:

    以Al-6Mg-0.8Zn-0.5Mn-0.2Zr-0.2Er合金為基礎，對該材料的冷軋態(tài)，溫軋態(tài)，完全退火態(tài)進行拉伸測試和疲勞裂紋擴展速率測試。運用電子背散射衍射（EBSD），透射電鏡（TEM），掃描電鏡（SEM）對合金的原始組織，疲勞斷口,裂紋擴展路徑進行觀察，研究微觀組織對材料拉伸性能及疲勞裂紋擴展速率的影響。結果表明：溫軋態(tài)屈服強度高，裂紋擴展抗力大，實現了高強高耐損傷性能的匹配。這主要是由于溫軋態(tài)軋制過程中發(fā)生動態(tài)回復，位錯纏結規(guī)整化，具有較多的亞晶界，該種組織模式對材料的屈服強度和疲勞裂紋擴展抗力均有提高。

    Abstract:

    The tensile strength and fatigue crack propagation rate test were carried out for cold rolled, warm rolled and full annealed Al-6Mg-0.8Zn-0.5Mn-0.2Zr-0.2Er alloy. The microstructure before fatigue test , the fatigue fracture and crack propagation path were observed by using electron back-scattered diffraction(EBSD), transmission electron microscope(TEM) and scanning electron microscope(SEM) in order to analyze the effects of microstructure on tensile property and fatigue crack propagation property. The results show that the fatigue crack propagation rate of warm rolled alloy with high strength is much slower than the cold rolled. The microstructure characterization shows that the warm rolled alloy has more subgrain boundaries than that of the cold rolled and full annealed alloys due to dynamic recovery during warm rolling. This kind of microstructure is conducive to the improvement of yield strength and fatigue crack propagation resistance.

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王歡,黃暉. Al-6Mg-0.8Zn-0.5Mn-0.2Zr-0.2Er合金高強耐損傷工藝與微觀組織研究[J].稀有金屬材料與工程,2016,45(6):1534~1538.[wang huan, huang hui. The investigation on the process and microstructure with high strength and high damage tolerance in Al-6Mg-0.8Zn-0.5Mn-0.2Zr-[J]. Rare Metal Materials and Engineering,2016,45(6):1534~1538.]
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  • 收稿日期:2014-05-26
  • 最后修改日期:2014-07-01
  • 錄用日期:2014-07-28
  • 在線發(fā)布日期: 2016-10-08
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