Cu含量及热处理对Al-Cu-Mn合金显微组织及力学性能的影响  

Effect of Cu Content and Heat Treatment on Microstructure and Mechanical Properties of Al-Cu-Mn Alloys

作　　者：宋转转 尹登峰[1] 王华[1] 谢凯文 徐庆 SONG Zhuanzhuan;YIN Dengfeng;WANG Hua;XIE Kaiwen;XU Qing(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2024年第6期156-162,共7页Mining and Metallurgical Engineering

基　　金：广东省科技计划项目(0214B090903012);徐州市科技项目(KC20006)。

摘　　要：研究了热处理制度和Cu含量对2种常规铸造Al-Cu-Mn合金组织与力学性能的影响。结果表明:Cu2.8合金适宜的热处理制度为525℃×16 h+170℃×8 h,Cu5.7合金适宜的热处理制度为525℃×16 h+170℃×14 h;在此热处理制度下,Cu2.8合金与Cu5.7合金抗拉强度分别达到209.76 MPa、349.15 MPa,屈服强度分别为107.15 MPa、216.21 MPa。详细研究了时效后合金的析出行为,Cu含量对Al-Cu-Mn合金时效析出行为有重要影响,固溶过程中T相的析出使低Cu合金Cu原子贫化,θ′相只在T相附近黏附,只有高Cu合金基体中才能析出弥散的θ″相,θ″相是高Cu合金强度更高的主要原因。Effects of heat treatment system and Cu content on the microstructure and mechanical properties of two conventionally cast Al-Cu-Mn alloys were investigated.It is found that after treatment at proper temperatures,including 525 ℃ × 16 h + 170 ℃ × 8 h for Cu2.8 alloy,525 ℃ × 16 h + 170 ℃ × 14 h for Cu5.7 alloy,the Cu2.8 alloy and Cu5.7 alloy have their tensile strength up to 209.76 MPa and 349.15 MPa respectively,and yield strength reaching 107.15 MPa and 216.21 MPa correspondingly.The detailed exploration of precipitation behavior of the alloy after aging indicates that Cu content brings an important influence to the precipitation behavior.The precipitation of the T phase leads to depletion of Cu atoms in low-Cu alloy during solid solution process.The θ′ phases only adhere near the T phase,and dispersed θ″ phases are only precipitated in the high-Cu alloy,which contribute mainly to higher strength of high-Cu alloy.

关 键 词：AL-CU-MN合金 热处理 微观组织 力学性能 时效强化 固溶处理 析出相 弥散强化 

分 类 号：TG156[金属学及工艺—热处理] TB302[金属学及工艺—金属学]