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動高壓加載條件下Ti-6Al-4V和Ti-47Nb合金層裂微結(jié)構(gòu)演化規(guī)律的研究
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蘭州理工大學(xué) 省部共建有色金屬先進(jìn)加工與再利用國家重點(diǎn)實驗室,北京理工大學(xué) 材料科學(xué)與工程學(xué)院,北京理工大學(xué) 材料科學(xué)與工程學(xué)院,北京理工大學(xué)材料科學(xué)與工程學(xué)院,蘭州理工大學(xué) 機(jī)電工程學(xué)院

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中圖分類號:

TG 146.23

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國家自然科學(xué)基金資助(項目號51001014);國家自然科學(xué)基金項目（面上項目，重點(diǎn)項目，重大項目）


Spall microstructure evolution of Ti-6Al-4V and Ti-47Nb titanium alloys at the dynamic high-pressure loading
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State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,School of Material Science and Engineering,Beijing Institute of Technology,,,School of Mechanical and Electronical Engineering,Lanzhou University of Technology

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    摘要:

    利用平板撞擊實驗和樣品軟回收技術(shù)，結(jié)合光學(xué)顯微鏡(OM)、掃描電子顯微鏡(SEM)等微觀分析手段，研究了動高壓加載條件下Ti-6Al-4V和Ti-47Nb兩種不同類型鈦合金的層裂微結(jié)構(gòu)特征與斷裂機(jī)理。實驗表明：Ti-6Al-4V合金的抗層裂破壞能力強(qiáng)于Ti-47Nb合金，其原因在于Ti-6Al-4V合金的高強(qiáng)度。Ti-6Al-4V合金層裂微孔洞大多在α/β兩相界面處形核并沿相界擴(kuò)展，而Ti-47Nb合金中的微裂紋是通過微孔洞直接連通形成。隨后匯合的大空洞或大裂紋間形成的絕熱剪切帶(ASB)加速了試樣層裂破壞的產(chǎn)生，Ti-6Al-4V與Ti-47Nb合金均表現(xiàn)出了韌性斷裂特征。

    Abstract:

    Spall microstructure characteristics and failure mechanism of Ti-6Al-4V and Ti-47Nb titanium alloys were studied through plate impact experiments and “sample soft-capture” technology at the dynamic high-pressure loading, as well as careful microscopic analyses using optical microscopy and scanning electronic microscopy. The experiment indicates that Ti-6Al-4V alloys have stronger ability of spall resistance than Ti-47Nb alloys because of the high strength of Ti-6Al-4V alloys. The micro-voids in the spalled Ti-6Al-4V alloys almost nucleate at the α/β phase boundaries and propagate along the phase boundaries, and the micro-cracks of Ti-47Nb alloys are direct connected through micro-voids. Subsequently, adiabatic shear band formed between macroscopic voids or main cracks promote the spall fracture of samples. Ti-6Al-4V and Ti-47Nb alloys fracture with ductile characteristics.

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劉慧,于曉東,譚成文,趙慧林,陳秀娟.動高壓加載條件下Ti-6Al-4V和Ti-47Nb合金層裂微結(jié)構(gòu)演化規(guī)律的研究[J].稀有金屬材料與工程,2018,47(3):829~834.[Liu Hui, Yu Xiaodong, Tan Chengwen, Zhao Huilin, Chen Xiujuan. Spall microstructure evolution of Ti-6Al-4V and Ti-47Nb titanium alloys at the dynamic high-pressure loading[J]. Rare Metal Materials and Engineering,2018,47(3):829~834.]
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歷史
  • 收稿日期:2016-01-11
  • 最后修改日期:2016-05-31
  • 錄用日期:2016-06-12
  • 在線發(fā)布日期: 2018-04-11
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