预拉伸对5182-O和5754-O铝合金屈服平台的影响  

Influence of pre-stretching on yield platform of 5182-O and 5754-O aluminum alloys

作　　者：黎凤 许泽兵 任月路[1] 黄程毅 徐燕萍[1] 陈帆 杨振兴 LI Feng;XU Ze-bing;REN Yue-lu;HUANG Cheng-yi;XU Yan-ping;CHEN Fan;YANG Zhen-xing(Alnan Aluminum Inc.,Nanning 530031,China)

机构地区：[1]广西南南铝加工有限公司,广西南宁530031

出　　处：《轻合金加工技术》2020年第11期26-31,45,共7页Light Alloy Fabrication Technology

基　　金：广西创新驱动发展专项(科技重大专项)项目(2017-008-G-VS)。

摘　　要：O状态的高Mg含量铝合金室温变形时材料表面容易出现吕德斯带。为了深入了解其机制,试验研究了不同预拉伸变形量对5182-O和5754-O铝合金板屈服平台的影响,并且对预拉伸试样进行了TEM分析。试验结果表明:随着预拉伸量的增加屈服平台长度减少,预变形量达到1.0%时屈服平台消失,同时屈服平台的长度与合金成分有关。TEM分析表明位错密度对5182-O和5754-O铝合金的屈服平台的形成起关键作用。It is easy to form Lüders band on the surface of Al alloy in O temper with high Mg content at room temperature.In order to further understand the mechanism,the effect of different pre-stretching deformation on the yield platform of 5182-O and 5754-O aluminum alloy plates was experimentally studied,and the pre-stretching samples were analyzed by TEM.The experiment result shows that the length of yield platform decreases with the increase of pre-stretching amount.The yield platform disappears when the pre-deformation reaches 1.0%,and the yield platform length is related to the alloy composition.TEM analysis shows that dislocation density plays a key role in the formation of yield platform of 5182-O and 5754-O aluminum alloys.

关 键 词：5182-O铝合金 5754-O铝合金 预拉伸 柯氏气团 TEM分析 位错密度 

分 类 号：TG339[金属学及工艺—金属压力加工]