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細(xì)晶Ti-6Al-4V 寬幅板材的超塑性變形機(jī)理及組織演變
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1.西部金屬材料股份有限公司;2.西北工業(yè)大學(xué)

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Foundation item: National Natural Science Foundation of China(51471136)


Superplastic deformation mechanism and simultaneous microstructure evolution of fine grained Ti-6Al-4V wide sheet
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Foundation item: National Natural Science Foundation of China(51471136)

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    摘要:

    通過恒應(yīng)變速率拉伸試驗，在1103K-1223K溫度范圍、3.2×10-4 s-1 to 1×10-2s-1應(yīng)變速率范圍內(nèi)，研究了Ti-6Al-4V寬幅板材的超塑性，在實驗中獲得了100%-604%延伸率。分析了組織演變和變形機(jī)理，其主要變形機(jī)理為晶界滑移，以晶內(nèi)位錯運動和β相的晶內(nèi)滑移為協(xié)調(diào)機(jī)制。實驗中還發(fā)現(xiàn)在低溫下變形時，Ti-6Al-4V寬幅板材存在各向異性，當(dāng)在高溫下變形時，各向異性不太明顯。

    Abstract:

    The superplasticity of fine grained Ti-6Al-4V wide sheet was investigated by constant strain rate tensile method in this work. The superplastic tensile tests were carried out at temperatures ranging from 1103K to 1223K and strain rates from 3.2×10-4 s-1 to 1×10-2s-1. The tensile elongation to failure values between 100% and 604% were obtained. Microstructure evolution and deformation mechanism were analyzed. The main deformation mechanism was grain boundary sliding, accommodated by matrix dislocation movement and the intragranular slip of β phase. It was also found that the Ti-6Al-4V wide sheet showed anisotropy when deformed at lower temperatures, which was obviously reduced when deformed at higher temperatures.

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張雪華,趙永慶,曾衛(wèi)東.細(xì)晶Ti-6Al-4V 寬幅板材的超塑性變形機(jī)理及組織演變[J].稀有金屬材料與工程,2020,49(2):391~397.[zhang xuehua, zhao yongqing, zeng weidong. Superplastic deformation mechanism and simultaneous microstructure evolution of fine grained Ti-6Al-4V wide sheet[J]. Rare Metal Materials and Engineering,2020,49(2):391~397.]
DOI：10.12442/j. issn.1002-185X.20190606

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  • 收稿日期:2019-07-18
  • 最后修改日期:2019-10-17
  • 錄用日期:2019-10-18
  • 在線發(fā)布日期: 2020-03-12
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