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動態(tài)塑性變形純鈦的絕熱剪切帶研究
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國家自然科學(xué)基金（51071183，50890170，51271208）


Study on Adiabatic Shear Band in Pure Titanium Subjected to Dynamic Plastic Deformation
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    摘要:

    利用動態(tài)塑性變形（DPD）技術(shù)對純鈦圓柱樣品進行動態(tài)壓縮試驗，研究了高應(yīng)變下出現(xiàn)的絕熱剪切帶（ASB）及兩側(cè)過渡區(qū)的顯微組織和硬度分布。結(jié)果發(fā)現(xiàn)：ASB僅出現(xiàn)在動態(tài)壓縮應(yīng)變大于等于0.6的DPD樣品中，在準(zhǔn)靜態(tài)壓縮對比試驗中未出現(xiàn)，表明其受應(yīng)變速率和應(yīng)變兩者共同影響。剪切帶內(nèi)部硬度略低于基體，而過渡區(qū)硬度明顯低于基體。通過Zerilli-Armstrong本構(gòu)模型和熱擴散距離計算分析表明，計算的過渡區(qū)與絕熱溫升熱影響區(qū)寬度與試驗結(jié)果基本相符，初始晶粒動態(tài)再結(jié)晶形成等軸晶組織并引起組織軟化。

    Abstract:

    The cylindrical pure Ti specimens were compressed by dynamic plastic deformation (DPD). The microstructure and microhardness of adiabatic shear bands (ASB) and transitional zones were investigated at high strains. The results show that ASBs are only found in DPD samples at high strains (ε≥0.6), but not found in low-strain or quasi-static compression samples. These suggest that the ASBs are affected by both strain rate and strain. The hardness of ASBs is slightly lower than that of the matrix; however, the hardness of transitional zones is obviously lower than that of the matrix. These results are researched by Zerilli-Armstrong constitutive model and heat diffuse equation. The computational widths of the heat-affected zone and the transitional zone are consistent with the experimental results. The formation of equiaxed grains is due to dynamic recrystallization of deformed grains. This process results in hardness reduction of the transitional zone.

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許 峰,張喜燕,程佑銘.動態(tài)塑性變形純鈦的絕熱剪切帶研究[J].稀有金屬材料與工程,2013,42(4):801~804.[Xu Feng, Zhang Xiyan, Cheng Youming. Study on Adiabatic Shear Band in Pure Titanium Subjected to Dynamic Plastic Deformation[J]. Rare Metal Materials and Engineering,2013,42(4):801~804.]
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  • 收稿日期:2012-07-21
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