Effect of Mn and Mo on microstructure and mechanical properties of Al-Si-Cu-Mg-0.6Fe alloy  

作　　者：Hao He Jing Zou Hai-tao Zhang Da-chuan Hu Zhi-jun Feng Yu-fei Li Ze-hua Li Hua-cheng Li 

机构地区：[1]National Key Laboratory of Advanced Casting Technologies,Shenyang 110022,China [2]Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China

出　　处：《China Foundry》2023年第6期511-518,共8页中国铸造（英文版）

基　　金：This work was financially supported by the Key Research and Development Program of Shandong Province(No.2021SFGC1001);the National Natural Science Foundation of China(No.U1864209).

摘　　要：Effect of different Mn and Mo contents on microstructure and mechanical properties of Al-Si-Cu-Mg-0.6Fe alloy was studied.Results indicate that the increase of Mo and decrease of Mn lead to a decrease in the size of theα-Al_(15)(FeMnMo)_(3)Si_(2) phase formed during solidification.Theα-Al_(15)(FeMnMo)_(3)Si_(2) phase reaches a minimum value of about 16.3μm at 0.2wt.%Mo and 0.1wt.%Mn addition.After solution treatment,theα-Al(FeMnMo)Si dispersed phase is precipitated.When only Mn is added,theα-Al(FeMnMo)Si dispersed phase mainly distributes near the grain boundaries,while when only Mo is added,it primarily distributes in the central region of the matrix.When both Mn and Mo are added,the dispersed phase has a larger and denser dispersed region and is uniformly distributed near the Al matrix and grain boundaries.Moreover,the best overall mechanical properties of the alloy are obtained with the combined addition of 0.1wt.%Mn and 0.2wt.%Mo,due to the smaller size ofα-Al_(15)(FeMnMo)_(3)Si_(2) phase and the larger area fraction and higher density of theα-Al(FeMnMo)Si dispersed phase.The yield strength,ultimate tensile strength,and elongation are respectively improved 67.7 MPa,48.5 MPa and 5.3%,respectively,compared to that of the alloy with only 0.3wt.%Mn.

关 键 词：Al-Si-Cu-Mg-0.6Fe alloy Mn and Mo microstructure mechanical properties solution treatment 

分 类 号：TG146.21[一般工业技术—材料科学与工程]