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多應變率下Ti-811鈦合金針狀組織壓縮變形及斷裂機制
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1.太原理工大學材料科學與工程學院;2.太原理工大學機械與運載工程學院

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國家自然科學基金資助(項目號51801132)


The compressive deformation and fracture mechanism for the acicular microstructure of Ti-811 titanium alloy under different strain rates
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an

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    摘要:

    本文采用Instron力學實驗機及分離式 Hopkinson 壓桿系統(tǒng),分別對Ti-811鈦合金針狀組織進行靜、動態(tài)壓縮實驗,以研究其不同應變率下的變形及斷裂機制。結果表明：隨應變率升高,針狀組織屈服強度依次呈現(xiàn)正-負-正的應變速率敏感性,其內(nèi)在原因是位錯滑移機制和孿生變形機制的相互競爭。針狀組織在靜態(tài)和動態(tài)加載下的斷裂機制明顯不同,分別呈現(xiàn)為雙剪切及單剪切斷裂模式。動態(tài)加載試樣端面部位可形成連續(xù)鋸齒型金屬屑,這是由于高速變形過程中主剪切帶兩側(cè)金屬的劇烈錯動被入射桿與透射桿遏制所導致。

    Abstract:

    The static and dynamic compression tests of Ti-811 alloy with acicular microstructure have been conducted by using the Instron testing machine and the split Hopkinson bar system respectively. Its deformation and fracture mechanism under various strain rates have been studied. The results show that: the yield strength of acicular microstructure exhibits positive-negative-positive strain rate sensitivity successively with increasing strain rate. The intrinsic reason is the competition between dislocation slip and twinning mechanism. The fracture mechanisms of acicular microstructure under static and dynamic compression are obviously different, which show double-shearing and single-shearing fracture mode respectively. Saw-tooth chips formed at the end faces of dynamic compression specimen, which is due to restraint of the severe relative slide of the material at the two sides of primary shearing band by incident bar and transmission bar.

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石曉輝,曹祖涵,張團衛(wèi),王志華,喬珺威.多應變率下Ti-811鈦合金針狀組織壓縮變形及斷裂機制[J].稀有金屬材料與工程,2020,49(5):1799~1802.[Xiaohui Shi, Zuhan Cao, Tuanwei Zhang, Zhihua Wang, Junwei Qiao. The compressive deformation and fracture mechanism for the acicular microstructure of Ti-811 titanium alloy under different strain rates[J]. Rare Metal Materials and Engineering,2020,49(5):1799~1802.]
DOI：10.12442/j. issn.1002-185X.20190107

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  • 收稿日期:2019-01-27
  • 最后修改日期:2019-03-03
  • 錄用日期:2019-03-26
  • 在線發(fā)布日期: 2020-06-05
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