准原位拉伸1420Al-Li合金的织构变化  

Texture of 1420 Al-Li alloy in quasi-in-situ tension

作　　者：陈忠伟[1] 赵静[1] 艾艳玲[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《电子显微学报》2011年第4期328-333,共6页Journal of Chinese Electron Microscopy Society

基　　金：航天创新基金2009资助项目

摘　　要：1420Al-Li合金以其高比强度,高比刚度以及优良的低温性能,良好的耐腐蚀性和成型性而成为航空航天理想的轻质结构材料。本文对1420Al-Li合金进行了准原位拉伸试验,利用场发射扫描电子显微镜上安装的背散射电子衍射仪(EBSD-Channel5)对试样进行取向分析。EBSD结果表明:拉伸之前,1420Al-Li合金试样中存在弱织构{001}<100>;拉伸之后,弱织构消失,试样拉伸区存在近似于{001}<100>的{018}<018>织构。拉伸过程中晶粒绕晶带轴[001]和[010]发生转动,引起合金试样拉伸前后织构的变化。1420 alloy is Al-Mg-Li aluminum-lithium alloy.Due to their low density,high-strength and weldable property,1420 alloys are regarded as ideal structural materials for aerospace and aviation applications.Quasi-in-situ tension experiments of the 1420 alloy samples were carried out on the specimens loading stage of NTSET-5000 tensile testing machine.EBSD tests on the texture in tension regions of the sample after ion etching were performed in field-emission scanning electron microscope by HKL Channel 5.EBSD analysis in tension region of samples showed the change of the crystal texture.Basal weak texture {100}〈100〉 was found in the 1420 alloy before tension.During the tension process,the grains rotated around the crystal zone axis and .As a result,the texture of the extruded 1420 sample transformed from {001}〈100〉 to {018}〈018〉 orientation,which was similar with {001}〈100〉 orientation.

关 键 词：1420AL-LI合金 准原位拉伸 EBSD 织构 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG115.213[金属学及工艺—金属材料]