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復合加工制備的超細晶工業(yè)純鈦室溫蠕變行為研究
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西安建筑科技大學冶金工程學院,西安建筑科技大學冶金工程學院,西安建筑科技大學冶金工程學院,西安建筑科技大學冶金工程學院,西安建筑科技大學冶金工程學院

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國家自然科學基金面上項目(51474170)；陜西省自然科學基礎(chǔ)研究青年人才項目(2016JQ5026) )；陜西省教育廳重點實驗室項目(15JS058 )；


Investigation of creep behavior of ultra-fine grained CP-Ti processed by combined machining at room temprature
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School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an,School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an,School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an,School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an,School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an

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    摘要:

    工業(yè)純鈦TA1經(jīng)等徑彎曲通道變形(Equal channel angular pressing, ECAP)+冷軋(Cold Rolling, CR)+旋鍛(Swaging)的方法制得晶粒尺寸約為120 nm的超細晶工業(yè)純鈦，通過單軸拉伸蠕變實驗、透射電子顯微鏡（TEM）、掃描電子顯微鏡（SEM）等方法，研究室溫下超細晶工業(yè)純鈦蠕變變形行為及機理。結(jié)果表明：在實驗應(yīng)力范圍內(nèi)，超細晶工業(yè)純鈦存在明顯的室溫蠕變現(xiàn)象；隨加載應(yīng)力的上升(640MPa~760MPa)，蠕變量增加，穩(wěn)態(tài)蠕變速率增大(2.8×10-7s-1~1.5×10-4s-1)；在相同蠕變應(yīng)力水平(0.8σs)下，超細晶工業(yè)純鈦穩(wěn)態(tài)蠕變速率(2.8×10-7s-1)低于粗晶工業(yè)純鈦(8.6×10-6s-1)，抗蠕變性能優(yōu)于粗晶工業(yè)純鈦；位錯滑移機理是其主要蠕變變形機理，蠕變斷裂機制為韌性斷裂。

    Abstract:

    Ultra-fine grained commercially pure (CP) Ti with an average grain size of 120 nm was fabricated by equal channel angular pressing (ECAP) following cold rolling (CR) and swaging at room temperature. Uniaxial tensile creep tests, transmission electron microscope and scanning electron microscope were applied to investigate the creep behavior and mechanism of ultra-fine grained CP Ti. The results showed that a significant creep deformation at room temperature occurred in the ultra-fine grained CP Ti. The steady creep rate increased from 2.8×10-7 s-1 to 1.5×10-4 s-1 as the creep stress increased from 640 MPa to 760 MPa. Ultra-fine grained CP Ti had lower steady creep rate than the coarse-grained CP Ti at the same stress level, which indicated that ultra-fine grained CP Ti had higher creep resistance. The creep mechanism of ultra-fine grained CP Ti is dislocation movement. The creep fracture morphology of ultra-fine grained CP Ti exhibited ductile fracture with dimples.

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楊西榮,陳小龍,羅雷,劉曉燕,蔡文華.復合加工制備的超細晶工業(yè)純鈦室溫蠕變行為研究[J].稀有金屬材料與工程,2018,47(7):2126~2131.[Yang Xirong, Chen Xiaolong, Luo Lei, Liu Xiaoyan, Cai Wenhua. Investigation of creep behavior of ultra-fine grained CP-Ti processed by combined machining at room temprature[J]. Rare Metal Materials and Engineering,2018,47(7):2126~2131.]
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  • 收稿日期:2016-06-27
  • 最后修改日期:2016-08-30
  • 錄用日期:2016-09-14
  • 在線發(fā)布日期: 2018-10-10
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