-1的范圍內(nèi)，對Ti6321鈦合金進(jìn)行動(dòng)態(tài)壓縮試驗(yàn)，研究溫度和應(yīng)變速率對材料力學(xué)性能和變形行為的影響。采用光學(xué)顯微鏡（OM）、透射電子顯微鏡（TEM）和電子背散射衍射（EBSD）表征和分析了合金的微觀結(jié)構(gòu)演變。結(jié)果表明，隨著溫度的降低和應(yīng)變速率的增加，Ti6321鈦合金的動(dòng)態(tài)屈服強(qiáng)度和平均流動(dòng)應(yīng)力均增大，而斷裂應(yīng)變明顯降低。采用Johnson-Cook本構(gòu)方程預(yù)測了Ti6321鈦合金在低溫高應(yīng)變速率下的力學(xué)行為，擬合結(jié)果與實(shí)驗(yàn)結(jié)果吻合較好。微觀結(jié)構(gòu)分析表明，隨著變形溫度的降低，｛112｝和｛101｝2種孿晶的含量明顯增加，即變形機(jī)制逐漸由孿晶的輔助作用轉(zhuǎn)變?yōu)閷\晶占主導(dǎo)地位。"/>

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Ti-6Al-3Nb-2Zr-1Mo鈦合金在低溫高應(yīng)變速率下的變形行為
作者:
作者單位:

1.北京理工大學(xué) 材料學(xué)院，北京 100081;2.北京理工大學(xué) 沖擊環(huán)境材料技術(shù)國家級(jí)重點(diǎn)實(shí)驗(yàn)室，北京 100081;3.北京理工大學(xué) 爆炸科學(xué)與技術(shù)國家重點(diǎn)實(shí)驗(yàn)室，北京 100081

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基金項(xiàng)目:

爆炸科學(xué)與技術(shù)國家重點(diǎn)實(shí)驗(yàn)室基金（YBKT17-06）


Deformation Behavior of Ti-6Al-3Nb-2Zr-1Mo Titanium Alloy at Low Temperatures and High Strain Rates
Author:
Affiliation:

1.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2.National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China;3.State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Fund Project:

State Key Laboratory of Explosive Science and Technology Fund (YBKT17-06)

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    摘要:

    在變形溫度為193~298 K、應(yīng)變速率為2000~3000 s-1的范圍內(nèi)，對Ti6321鈦合金進(jìn)行動(dòng)態(tài)壓縮試驗(yàn)，研究溫度和應(yīng)變速率對材料力學(xué)性能和變形行為的影響。采用光學(xué)顯微鏡（OM）、透射電子顯微鏡（TEM）和電子背散射衍射（EBSD）表征和分析了合金的微觀結(jié)構(gòu)演變。結(jié)果表明，隨著溫度的降低和應(yīng)變速率的增加，Ti6321鈦合金的動(dòng)態(tài)屈服強(qiáng)度和平均流動(dòng)應(yīng)力均增大，而斷裂應(yīng)變明顯降低。采用Johnson-Cook本構(gòu)方程預(yù)測了Ti6321鈦合金在低溫高應(yīng)變速率下的力學(xué)行為，擬合結(jié)果與實(shí)驗(yàn)結(jié)果吻合較好。微觀結(jié)構(gòu)分析表明，隨著變形溫度的降低，｛112｝和｛101｝2種孿晶的含量明顯增加，即變形機(jī)制逐漸由孿晶的輔助作用轉(zhuǎn)變?yōu)閷\晶占主導(dǎo)地位。

    Abstract:

    Dynamic compression tests of Ti6321 titanium alloy were carried out in the temperature range from 193 K to 298 K and strain rate range from 2000 s-1 to 3000 s-1 to study the effects of temperature and strain rate on the mechanical properties and deformation behavior of the alloy. The microstructure evolution was observed and analyzed by optical microscope (OM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). The results show that with decreasing temperature and increasing strain rate, dynamic yield strength and average flow stress of Ti6321 titanium alloy increase, while the fracture strain decreases obviously. Johnson-Cook constitutive equation is used to predict the mechanical behavior at low temperatures and high strain rates, and the fitting results are in good agreement with the experimental ones. Microstructural study shows that the content of the {112} and {101} extension twins increases significantly as the deformation temperature decreases. The deformation mechanism gradually changes from the auxiliary role of twins to the dominance of twins.

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李嚴(yán)星,王琳,安瑞,趙平洛,閆志維,程煥武,程興旺.Ti-6Al-3Nb-2Zr-1Mo鈦合金在低溫高應(yīng)變速率下的變形行為[J].稀有金屬材料與工程,2022,51(12):4369~4375.[Li Yanxing, Wang Lin, An Rui, Zhao Pingluo, Yan Zhiwei, Cheng Huanwu, Cheng Xingwang. Deformation Behavior of Ti-6Al-3Nb-2Zr-1Mo Titanium Alloy at Low Temperatures and High Strain Rates[J]. Rare Metal Materials and Engineering,2022,51(12):4369~4375.]
DOI：10.12442/j. issn.1002-185X.20220181

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  • 收稿日期:2022-03-08
  • 最后修改日期:2022-05-19
  • 錄用日期:2022-06-16
  • 在線發(fā)布日期: 2023-01-11
  • 出版日期: 2022-12-30