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不同應(yīng)力狀態(tài)下TC6鈦合金不同組織絕熱剪切敏感性研究
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楚雄師范學(xué)院院級重點(diǎn)資助項(xiàng)目 (10YJZD04)；楚雄師范學(xué)院學(xué)術(shù)骨干資助項(xiàng)目 (09YJGG02)


Study on Adiabatic Shearing Sensitivity of Different Microstructures of TC6 Titanium Alloy at Different Stress States
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    摘要:

    采用分離式霍普金森壓桿裝置，對TC6鈦合金不同組織的圓柱試樣和帽形試樣分別進(jìn)行應(yīng)變率為103 s-1量級的動(dòng)態(tài)壓縮及動(dòng)態(tài)剪切試驗(yàn)，結(jié)合力學(xué)響應(yīng)及微觀分析研究不同應(yīng)力狀態(tài)下TC6鈦合金3種典型組織的絕熱剪切敏感性。結(jié)果表明：在單軸壓縮應(yīng)力狀態(tài)下，TC6鈦合金3種典型組織絕熱剪切敏感性從高到低依次為網(wǎng)籃組織、等軸組織、雙態(tài)組織；在壓剪復(fù)合應(yīng)力狀態(tài)下，3種典型組織在動(dòng)態(tài)剪切時(shí)的絕熱剪切敏感性從大到小依次為等軸組織、雙態(tài)組織、網(wǎng)籃組織；應(yīng)力狀態(tài)不同，組織絕熱剪切敏感性的差異實(shí)質(zhì)上體現(xiàn)了組織在不同應(yīng)力狀態(tài)下的塑性變形能力及絕熱剪切帶在不同組織中擴(kuò)展的難易程度

    Abstract:

    By means of split Hopkinson bar, the dynamic compression and dynamic shear tests on TC6 titanium alloy with different microstructures were carried out under the condition of high strain-rate loading; the specimens are cylindrical and hat-shaped, respectively. The adiabatic shearing sensitivities of the three kinds of typical microstructures of TC6 titanium alloy at different stress states were studied by mechanical response and micro-analysis. Results show that at the stress state of uniaxial compression, the descending order for the adiabatic shearing sensitivities of these typical microstructures are basketwave, equiaxed and duplex. And at the stress state of compression-shearing combination, their descending order is equiaxed, duplex and basketwave. The difference in the adiabatic shearing sensitivity is substantively the embodiment of plastic deforming ability of different microstructures at different stress states and spreading ability of adiabatic shear band in different microstructures.

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徐 媛,孫 坤,自興發(fā),劉瑞明.不同應(yīng)力狀態(tài)下TC6鈦合金不同組織絕熱剪切敏感性研究[J].稀有金屬材料與工程,2011,40(11):2002~2005.[Xu Yuan, Sun Kun, Zi Xingfa, Liu Ruiming. Study on Adiabatic Shearing Sensitivity of Different Microstructures of TC6 Titanium Alloy at Different Stress States[J]. Rare Metal Materials and Engineering,2011,40(11):2002~2005.]
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  • 收稿日期:2010-11-26
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