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Ti555211合金片層組織裂紋擴展的SEM原位觀察
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1.西安航空學(xué)院 材料工程學(xué)院;2.西北有色金屬研究院;3.西北工業(yè)大學(xué)

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TG146.2

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國家自然科學(xué)基金面上項目資助(項目號：51471136),高等學(xué)校學(xué)科創(chuàng)新引智計劃 (“111” Project) (B08040)。


In-situ SEM observations of tensile deformation behavior of in a newnear β titanium alloy—Ti555211 with lamellar structure
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    摘要:

    利用SEM原位拉伸實驗，研究了Ti555211合金片層組織的拉伸變形和斷裂行為。結(jié)果表明：在拉伸載荷作用下，片層組織試樣中滑移帶優(yōu)先出現(xiàn)在與加載方向大于45°的片層組織上。在裂紋擴展過程中，合金內(nèi)滑移帶的密度均隨著載荷的增加逐漸增加，片層組織試樣為沿片層和跨片層交叉斷裂。原位拉伸試樣斷口分析表明，韌性斷裂是片層組織試樣的主要斷裂方式。試樣斷口存在明顯剪切唇和大量斷裂韌窩。SEM原位拉伸實驗分析方法能夠?qū)π滦蚑i555211近β鈦合金的變形和斷裂行為進行實時跟蹤，該方法的研究結(jié)果更加具有科學(xué)價值和參考意義。

    Abstract:

    The tensile deformation and fracture behavior of the Ti555211 alloy were investigated using in-situ SEM technology. Results showed that it was found that slip bands were given priority within the lamellar structure with the tensile loading direction for the Ti555211 alloy with initial lamellar structure. As the crack propagated, the slip bands appeared dense. Moreover, for the alloy with initial lamellar structure, the crack propagated from the corners of the indention both across and along the lamellar directions.The Ti555211 alloy with initial lamellar structure show different fracture morphologies. For the alloy with initial lamellar structure, visible shear lips and a number of dimples were observed in fracture. The deformation and fracture behavior of the near-β titanium alloy of Ti555211 can be tracked by the SEM in-situ tensile test method in real time. The results of this method are more scientific and informative.

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引用本文

安震,王琛,丁旭,謝輝,毛小南,張平祥,李金山. Ti555211合金片層組織裂紋擴展的SEM原位觀察[J].稀有金屬材料與工程,2019,47(3):853~858.[An Zhen, Wang Chen, Ding Xv, Xie Hui, Mao Xiaonan, Zhang Pingxiang, Li Jinshan. In-situ SEM observations of tensile deformation behavior of in a newnear β titanium alloy—Ti555211 with lamellar structure[J]. Rare Metal Materials and Engineering,2019,47(3):853~858.]
DOI：10.12442/j. issn.1002-185X.20180031

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  • 收稿日期:2018-01-09
  • 最后修改日期:2018-02-23
  • 錄用日期:2018-03-13
  • 在線發(fā)布日期: 2019-04-10
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