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TC6鈦合金絕熱剪切帶不同發(fā)展階段的精細結(jié)構(gòu)
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Fine Structure of Adiabatic Shear Band of TC6 Alloy under Different Evolvement Stages
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    摘要:

    采用分離式Hopkinson Bar技術(shù)對TC6鈦合金進行動態(tài)剪切試驗，通過光學(xué)顯微鏡、掃描電鏡及透射電鏡研究TC6鈦合金絕熱剪切帶不同發(fā)展階段的精細結(jié)構(gòu)及其形成機制。結(jié)果表明：在高應(yīng)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，TC6鈦合金絕熱剪切帶在不同發(fā)展階段的精細結(jié)構(gòu)有很大的不同，從萌生到完全發(fā)展，塑性變形劇烈程度逐漸增大，位錯在TC6鈦合金絕熱剪切帶的形成中起到非常重要的作用。

    Abstract:

    Dynamic shearing experiment has been done for TC6 titanium alloy by using a split Hopkinson bar process. The fine structure of adiabatic shear band of TC6 alloy under different evolvement stages has been studied by optical microscope (OP), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It is shown that the formation of adiabatic shear band of material goes through the three processes of initiation, expansion and full evolvement, for which the fine structure is quite different. The extent of plastic deformation increases gradually from the initiation stage to the full evolvement stage, during which the dislocations play a very important role.

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孫 坤,王富恥,程興旺,苗 普,趙雙贊. TC6鈦合金絕熱剪切帶不同發(fā)展階段的精細結(jié)構(gòu)[J].稀有金屬材料與工程,2009,38(2):233~236.[Sun Kun, Wang Fuchi, Cheng Xingwang, Miao Pu, Zhao Shuangzan. Fine Structure of Adiabatic Shear Band of TC6 Alloy under Different Evolvement Stages[J]. Rare Metal Materials and Engineering,2009,38(2):233~236.]
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  • 收稿日期:2008-01-27
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