预变形对Al-Cu-Li-Mn-Zr合金的第二相析出及力学性能的影响  

Effect of Pre-deformation on the Precipitation Behavior and Mechanical Property of Al-Cu-Li-Mn-Zr Alloy

作　　者：邓燕君 黄光杰[1] 曹玲飞[1] 吴晓东[1] 黄利[1] DENG Yanjun;HUANG Guangjie;CAO Lingfei;WU Xiaodong;HUANG Li(College of Materials Science and Engineering,Chongqing University,Chongqing 400044)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《材料导报》2018年第4期569-573,共5页Materials Reports

基　　金：国家自然科学基金(51421001);中央高校基本科研基金(106112015CDJXY130003)

摘　　要：采用维氏硬度、常温拉伸及透射电子显微镜等测试手段,研究了不同预变形状态对Al-Cu-Li-Mn-Zr合金中第二相析出行为及力学性能的影响。结果表明,未经预变形的峰值时效态Al-Cu-Li-Mn-Zr合金的析出相有T_1(Al_2CuLi)相、θ′(Al_2Cu)相,且存在极少量的χ(Al_5Cu_6Li_2)相。预变形的引入使T_1相的析出量显著增加,同时抑制了θ′相的形成,但对χ相的析出量的影响却较小。由此可知,经预变形的合金在峰值时效态的析出相以细小弥散的T_1相为主。经定量统计可知,预变形量越大,作为主要析出相的盘片状T_1相的直径越小,但厚度及体积分数几乎保持不变。此外,随着预变形量的增大,峰值时效态合金的屈服强度和抗拉强度升高,塑性降低。The effect of pre-deformation on the precipitation behavior and mechanical property of Al-Cu-Li-Mn-Zr alloy were investigated by Vickers hardness measurement,room-temperature tensile test and transmission electron microscopy(TEM)characterization.The results showed that in the peak aged Al-Cu-Li-Mn-Zr alloy without pre-deformation,the T 1 andθ′phases were usually dominant,while the amount ofχphase was very limited.When this alloy was subjected to the pre-deformation prior to aging,the formation of T 1 was promoted,and the nucleation ofθ′was inhibited,while there was little influence on the formation ofχphase.Therefore,the T 1 phase was primary precipitate in the aged alloy with pre-strain.With the increase of pre-strain,although the diameter of the T 1 precipitates became smaller,the thickness and volume fraction of them kept almost the same.In addition,when larger pre-strain was applied,the alloy showed higher strength and lower plasticity.

关 键 词：Al-Cu-Li-Mn-Zr合金 预变形 T 1相 析出强化 

分 类 号：TG166.3[金属学及工艺—热处理]