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攪拌摩擦加工AZ31細晶鎂合金超塑性行為研究
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西安建筑科技大學

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TG146.2 2

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國家自然科學基金項目（面上項目，重點項目，重大項目）


Superplasticity of Fine-grained AZ31 Magnesium Alloy Prepared by Friction Stir Processing
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Xian University of Architecture and Technology

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    摘要:

    借助攪拌摩擦加工工藝制備了AZ31細晶鎂合金，研究對比了原始母材和各種晶粒尺寸細晶鎂合金的超塑性行為。結果表明：AZ31板材平均晶粒尺寸由7.67μm細化到0.94μm~3.21μm。在450℃，應變速率5×10-4/s-1時原始母材最大延伸率為630%，攪拌摩擦加工后的材料最大延伸率為405%，說明晶粒尺寸與超塑性性能沒有線性關系。超塑性變形機制主要是晶界滑移，孿生對變形也有一定影響。斷裂機制是晶間微小空洞的形成、長大和連接。

    Abstract:

    Using friction stir processing to produce fine-grained microstructure in AZ31 magnesium alloy. The superplasticity of base metal and fine-grained AZ31 magnesium alloy with different grain sizes were compared. The results show that microstructure of the AZ31 hot-rolled plate with an average grain size of 7.67μm is refined to 0.94μm~3.21μm. The maximum elongation of the BM is 630% at 450℃ and 5×10-4/s-1, The maximum elongation of the FSP AZ31 alloy is 405% in the same situation. Grain size have no linear relationship with superplastic performance. Superplastic deformation mechanism is mainly based on grain boundary sliding. Twin crystal also affects the deformation. The failure mechanism is cavity generation, growth and coalescence.

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高雪.攪拌摩擦加工AZ31細晶鎂合金超塑性行為研究[J].稀有金屬材料與工程,2016,45(7):1855~1860.[Gaoxue. Superplasticity of Fine-grained AZ31 Magnesium Alloy Prepared by Friction Stir Processing[J]. Rare Metal Materials and Engineering,2016,45(7):1855~1860.]
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  • 收稿日期:2014-06-11
  • 最后修改日期:2014-07-03
  • 錄用日期:2014-07-28
  • 在線發(fā)布日期: 2016-10-09
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