直流磁场对Al-4.5Cu合金结晶取向和力学性能的影响  

Effects of DC Magnetic Field on Crystal Orientation and Mechanical Properties of Al-4.5Cu Alloy

作　　者：黄曼青[1] 周全[1] 刘峰[1] 王俊[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2017年第7期795-799,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51261026)

摘　　要：研究了磁感应强度为0~1.4T的直流磁场对Al-4.5Cu合金结晶取向和力学性能的影响。结果表明,直流磁场对合金凝固组织的影响很小。随着磁感应强度的增加,合金第二相的体积分数逐渐下降,Cu在晶粒内部的含量逐渐增加。当磁感应强度小于0.84T时,α-Al基体在(111)面对应的衍射峰强度有所减弱,而在(200)面所对应的衍射峰明显增强;在0.84~1.4T时,与无磁场时相比,其结晶取向变化不大。直流磁场处理后,合金的抗拉强度均得到提高,而伸长率均有所降低;当磁感应强度为0.56T时,其抗拉强度最大,为104.5 MPa,比无磁场时提高了4.5%,伸长率最小为3.4%。The influence of DC magnetic field intensity （0~ 1.4 T） on grain orientation and mechanical properties of A1-4. 5Cu alloy were investigated. The results show that change of solidification micro- structure of the alloy can be ignored. Volume fraction of the second phase in the alloy is decreased grad- ually, and the content of Cu element in grain of the alloy is increased gradually with the increase of mag- netic field intensity. When the strength of DC magnetic field is less than 0.84 T, the diffraction intensity of crystal plane （111） of α-Al matrix is weakened, and the diffraction intensity of crystal plane （200） is enhanced significantly. The influence of DC magnetic field on crystal orientation of the alloy can be ig- nored when the magnetic field intensity is at 0.84~1.4 T, compared with the alloy without treatment. Tensile strength of the alloy is increased, while its elongation is decreased with DC magnetic field treat- ment. When the magnetic field intensity is 0. 56 T, tensile strength of the alloy reaches 104.5 MPa, which is increased by up to 4.5 %, compared with the sample without magnetic field treatment, and the elongation reaches a minimum value of 3.4 %.

关 键 词：直流磁场 AL-4.5CU合金 结晶取向 力学性能 

分 类 号：TG292[金属学及工艺—铸造]