本文關(guān)鍵詞：純鋁和純銅在管狀材料高壓切變過(guò)程中復(fù)合行為研究　出處：《南京理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

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【摘要】：通過(guò)管狀材料高壓切變技術(shù)分別對(duì)純鋁(99.98%和99.999%)與純銅(99.98%)進(jìn)行了不同應(yīng)變量的復(fù)合試驗(yàn),通過(guò)光學(xué)顯微鏡、電子掃描顯微鏡、電子背散射衍射技術(shù)及能譜分析技術(shù)對(duì)復(fù)合界面及其周?chē)娘@微組織進(jìn)行了表征,并通過(guò)剪切試驗(yàn)對(duì)其復(fù)合界面的剪切結(jié)合強(qiáng)度進(jìn)行了檢測(cè)。發(fā)現(xiàn)在不同的變形條件下對(duì)復(fù)合界面結(jié)合強(qiáng)度產(chǎn)生不同的影響。隨著平均等效應(yīng)變量的提高,復(fù)合界面結(jié)合效果得到明顯改善,并在較高應(yīng)變量下達(dá)到飽和,實(shí)現(xiàn)了界面有效的冶金結(jié)合。而在較高靜水壓力及較低應(yīng)變速率范圍內(nèi),靜水壓力和應(yīng)變速率對(duì)復(fù)合界面的結(jié)合效果影響不太明顯。實(shí)驗(yàn)前對(duì)樣品表面進(jìn)行預(yù)處理能夠顯著促進(jìn)復(fù)合界面的冶金結(jié)合。但是由于管壁內(nèi)沿半徑方向應(yīng)變梯度的存在,在相同轉(zhuǎn)動(dòng)角度條件下,內(nèi)層金屬的等效應(yīng)變量會(huì)大于外層金屬的等效應(yīng)變量,從而造成內(nèi)層金屬的加工硬化程度相對(duì)更大,而不利于變形的繼續(xù)進(jìn)行,因此在不同材料的復(fù)合試驗(yàn)中,內(nèi)層金屬適宜選擇加工硬化能力或強(qiáng)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(guò)程中表現(xiàn)出不同的顯微組織演化及織構(gòu)演化特征,而在銅鋁復(fù)合界面則觀察到了明顯的原子相互擴(kuò)散現(xiàn)象。通過(guò)對(duì)管狀材料高壓切變技術(shù)的變形特點(diǎn)及試樣表面的分析,我們發(fā)現(xiàn)試樣在加壓過(guò)程中減薄及在變形過(guò)程中產(chǎn)生彎折是管狀材料高壓切變過(guò)程中,材料內(nèi)外層復(fù)合出現(xiàn)新增界面的兩個(gè)主要來(lái)源,而后者占據(jù)了主導(dǎo)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(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB33

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