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  本文關鍵詞：純鋁和純銅在管狀材料高壓切變過程中復合行為研究　出處：《南京理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 純鋁 純銅 復合 管狀材料高壓切變技術

【摘要】：通過管狀材料高壓切變技術分別對純鋁(99.98%和99.999%)與純銅(99.98%)進行了不同應變量的復合試驗,通過光學顯微鏡、電子掃描顯微鏡、電子背散射衍射技術及能譜分析技術對復合界面及其周圍的顯微組織進行了表征,并通過剪切試驗對其復合界面的剪切結合強度進行了檢測。發(fā)現(xiàn)在不同的變形條件下對復合界面結合強度產(chǎn)生不同的影響。隨著平均等效應變量的提高,復合界面結合效果得到明顯改善,并在較高應變量下達到飽和,實現(xiàn)了界面有效的冶金結合。而在較高靜水壓力及較低應變速率范圍內(nèi),靜水壓力和應變速率對復合界面的結合效果影響不太明顯。實驗前對樣品表面進行預處理能夠顯著促進復合界面的冶金結合。但是由于管壁內(nèi)沿半徑方向應變梯度的存在,在相同轉(zhuǎn)動角度條件下,內(nèi)層金屬的等效應變量會大于外層金屬的等效應變量,從而造成內(nèi)層金屬的加工硬化程度相對更大,而不利于變形的繼續(xù)進行,因此在不同材料的復合試驗中,內(nèi)層金屬適宜選擇加工硬化能力或強度較低的材料。我們還發(fā)現(xiàn)高純鋁(99.999%)和低純鋁(99.98%)在管狀材料高壓切變過程中表現(xiàn)出不同的顯微組織演化及織構演化特征,而在銅鋁復合界面則觀察到了明顯的原子相互擴散現(xiàn)象。通過對管狀材料高壓切變技術的變形特點及試樣表面的分析,我們發(fā)現(xiàn)試樣在加壓過程中減薄及在變形過程中產(chǎn)生彎折是管狀材料高壓切變過程中,材料內(nèi)外層復合出現(xiàn)新增界面的兩個主要來源,而后者占據(jù)了主導作用。
[Abstract]:The high pressure tubular material shear technique in pure aluminum (99.98% and 99.999%) and copper (99.98%) of composite testing different variables, by means of optical microscope, scanning electron microscope, energy spectrum analysis and microstructure of composite interface and its surrounding technology were characterized by electron backscatter diffraction, and through shear test the composite interface bonding strength were tested. Found in different deformation conditions of composite interface strength have different effects. With the average effect variables increase, composite bonding effect is improved, and at the higher strain reaches saturation, the metallurgical interface at high effective combination. Hydrostatic pressure and low strain rate range, hydrostatic pressure and strain rate effect on the combined effect of composite interface was not obvious. On the surface of the sample before the experiment. The pretreatment can significantly promote the composite metallurgical bonding interface. But due to the presence of strain along the radius direction of the gradient in the tube wall, in the same rotation angle under the condition of the inner metal effect variables will be greater than the outer metal effect variables, resulting in hardening degree of inner metal is relatively large, and is not conducive to deformation therefore, the composite test of different materials, the inner layer metal suitable work hardening ability or low strength materials. We also found that high purity aluminum (99.999%) and low (99.98%) in pure aluminum tubular material high shear process showed the microstructure and texture evolution of different evolution characteristics, and in the composite interface copper is observed obvious atom diffusion phenomenon. Through the analysis of the deformation characteristics and the surface of the tubular material pressure shear technology, we found that the sample in the pressure process Thinning and bending in the course of deformation are two main sources of new interfaces added to the inner and outer layers of pipes during the high-pressure shear process, while the latter occupy the leading role.

【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB33

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