(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 西南鋁業(yè)（集團(tuán)）有限責(zé)任公司，重慶401326；
3. 湖南華菱線纜股份有限公司，湘潭 411104)
摘 要: 采用電子背散射衍射(EBSD)、透射電鏡(TEM)和室溫拉伸等方法研究了拉拔應(yīng)變量對1350航空線材組織和性能的影響。結(jié)果表明：原始1350鋁桿為等軸晶組織，大角度晶界占比較高；當(dāng)應(yīng)變量為0.61和1.28時，晶粒被拉長，形成大量胞塊結(jié)構(gòu)，大角度晶界占比顯著降低；當(dāng)應(yīng)變量≥2.31時，拉長晶粒的晶界逐漸趨于與拉拔方向平行，胞塊結(jié)構(gòu)逐漸轉(zhuǎn)變?yōu)閷訝罱Y(jié)構(gòu)，大角度晶界占比不斷增大。不同變形階段織構(gòu)類型有所不同，當(dāng)應(yīng)變量≤1.28時，線材以〈100〉織構(gòu)為主；當(dāng)應(yīng)變量≥2.31時，〈111〉織構(gòu)強(qiáng)度和體積分?jǐn)?shù)不斷增加。線材強(qiáng)化機(jī)制以位錯強(qiáng)化和晶界強(qiáng)化為主，隨著應(yīng)變量的增大兩者對強(qiáng)度的貢獻(xiàn)值不斷增加，當(dāng)應(yīng)變量達(dá)到3.90后，形成的強(qiáng)〈111〉織構(gòu)有較大的強(qiáng)化作用。
關(guān)鍵字: 航空線材；1350鋁合金；微觀組織；力學(xué)性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Southwest Aluminum (Group) Co., Ltd., Chongqing 401326, China;
3. Hunan Valin Cable Co., Ltd., Xiangtan 411104, China）
Abstract:The effect of drawing strain on the microstructure and properties of 1350 aerospace wire was investigated by electron backscattered diffraction (EBSD), transmission electron microscope (TEM) and ambient-temperature tensile test. The results show that the original 1350 aluminum rod has an equiaxed crystal structure, and the high-angle grain boundaries (HAGBs) account for a relatively high proportion. At the strains of 0.61 and 1.28, the grains are elongated to form a large number of cell block, and the proportion of the HAGBs is significantly reduced. At strain higher than 2.31, the grain boundaries of elongated grains are gradually parallel to the drawing direction, the cell block gradually transforms into a lamellar boundaries, and the proportion of HAGBs gradually increases. The texture types are different in different deformation stages. At strain less than 1.28, the wire is mainly made of 〈100〉 texture. At strain higher than 2.31, the intensity and volume fraction of 〈111〉texture increase continuously. The strengthening mechanism of wire is mainly dislocation strengthening and grain boundary strengthening. With the increase of the strain, the contribution of dislocation and grain boundary to the strength increases. When the strain reaches 3.90, the strong 〈111〉 texture has a relatively significant strengthening effect.
Key words: aviation wire; 1350 aluminum alloy; microstructure; mechanical property
