3s-1的動態(tài)壓縮過程中,“應力塌陷”現(xiàn)象是由于材料內(nèi)產(chǎn)生了大于一定尺寸的微裂紋所致。"/>

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TC6鈦合金動態(tài)壓縮變形中“應力塌陷”的形成原因
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楚雄師范學院材料制備及力學行為研究所,楚雄師范學院材料制備及力學行為研究所,楚雄師范學院材料制備及力學行為研究所,楚雄師范學院材料制備及力學行為研究所

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國家自然科學(51561002)；云南省應用基礎研究計劃項目(2011FZ185)


On the formation cause of stress collapse in TC6 alloy under dynamic compression
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Research institute on preparation and mechanical behavior of Materials,ChuXiong Normal University,Research institute on preparation and mechanical behavior of Materials,ChuXiong Normal University,Research institute on preparation and mechanical behavior of Materials,ChuXiong Normal University,Research institute on preparation and mechanical behavior of Materials,ChuXiong Normal University

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    摘要:

    采用分離式Hopkinson Bar技術(shù)和一種新型的中斷動態(tài)試驗方法對TC6鈦合金進行了動態(tài)壓縮試驗,通過光學顯微鏡、掃描電子顯微鏡分析了TC6鈦合金變形到不同應變量時所產(chǎn)生絕熱剪切帶的微觀形貌,通過與宏觀力學響應相對應,研究了TC6鈦合金在動態(tài)壓縮變形中,絕熱剪切帶的形成過程及造成應力快速下降的原因。結(jié)果表明：在高應變率下,材料絕熱剪切帶的形成是一個由萌生、擴展、完全發(fā)展組成的過程；在應變率為2.5×103s-1的動態(tài)壓縮過程中,“應力塌陷”現(xiàn)象是由于材料內(nèi)產(chǎn)生了大于一定尺寸的微裂紋所致。

    Abstract:

    Using the technology of split Hopkinson bar and a new method that can be used to interrupt test and obtain different amount of strain, dynamic compression test has been done on TC6 titanium alloy. By associating microstructure of shear band under different amount of strain with mechanical response of material, the formation cause of stress collapse in TC6 alloy under dynamic compression has been studied. It is shown that formation of adiabatic shear band of materials under high strain rate is a process composed of initiation, expansion and full development, and that stress collapse in stress-strain curvy is not resulted from the initiation and growing of adiabatic shear band, even involving cracks with its size not larger than certain critical size. Real reason of stress collapse in curvy is due to size of cracks has exceeded certain size within the adiabatic shear band.

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徐媛,向文麗,楊紅斌,孫坤. TC6鈦合金動態(tài)壓縮變形中“應力塌陷”的形成原因[J].稀有金屬材料與工程,2016,45(4):1078~1081.[Xu Yuan, Xiang Wenli, Yang Hongbin, Sun Kun. On the formation cause of stress collapse in TC6 alloy under dynamic compression[J]. Rare Metal Materials and Engineering,2016,45(4):1078~1081.]
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  • 收稿日期:2015-09-18
  • 最后修改日期:2015-11-16
  • 錄用日期:2015-12-08
  • 在線發(fā)布日期: 2016-06-01
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