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TC4鈦合金室溫滯后回彈研究
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北京理工大學材料學院,北京理工大學材料學院

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國家自然科學基金資助(項目號51175044)


The investigation of time-dependent springback for TC4 titanium alloy at room temperature
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Material School,Beijing Institute of Technology,Material School,Beijing Institute of Technology

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    摘要:

    為了探明TC4鈦合金室溫下的滯后回彈效應,采用萬能試驗機進行了不同預應變和不同加載速率的滯后回彈實驗；為了揭示滯后回彈變化規(guī)律的微觀機理,采用光鏡和透射電子顯微鏡對微觀組織進行表征。結果表明：TC4鈦合金經過室溫塑性變形卸載后尺寸繼續(xù)變化,具有明顯的滯后回彈效應。隨著預應變以及加載應變率的提高,滯后回彈應變(TDSS)的絕對值均呈現指數增長。組織分析表明,“流線型”光鏡組織、位錯塞積以及孿晶組織的演變與滯后回彈變化規(guī)律正相關。

    Abstract:

    The time-dependent springback and anelastic behavior of TC4 titanium alloy were investigated as a function of time, prescribed strain and loading strain rate by universal testing machine. In order to infer its basis, the microstructures of samples under different loading conditions were examined by optical microscope(OM) and transmission electron microscope(TEM). The results reveal that the absolute values of time-dependent springback strain(TDSS) accumulated in 10h both presented exponential growth, as the prescribed strain and loading strain rate went up. The OM and TEM results show that the evolutions of “streamline” microstructure, dislocation pile-up, and deformation twin had positive correlation with the change law of TDSS.

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孫 帥,鄂大辛. TC4鈦合金室溫滯后回彈研究[J].稀有金屬材料與工程,2017,46(11):3267~3271.[Sun Shuai, E daxin. The investigation of time-dependent springback for TC4 titanium alloy at room temperature[J]. Rare Metal Materials and Engineering,2017,46(11):3267~3271.]
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歷史
  • 收稿日期:2015-08-16
  • 最后修改日期:2015-09-28
  • 錄用日期:2015-10-13
  • 在線發(fā)布日期: 2017-12-13
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