直流脉冲磁场对Mg_(97)Y_2Cu_1合金组织和性能的影响  

Effect of DC Pulsed Magnetic Field on Solidified Structure and Mechanical Properties of Mg_(97)Y_2Cu_1 Alloy Reinforced by Long Period Ordered Structure

作　　者：谭水淋[1] 周全[1] 付浩[1] 谢小华[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》2014年第7期742-746,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51261026);航空科学基金资助项目(20125356009)

摘　　要：研究了直流脉冲磁感应强度和脉冲频率对长周期结构增强Mg97Y2CU1合金凝固组织和力学性能的影响。结果表明，直流脉冲磁场在O～O．25T范围内，随着磁感应强度的提高，合金的初生相逐渐细化，第二相逐渐粗化，且含量逐渐增加。在1～5Hz范围内，脉冲频率对合金组织的影响较小；当脉冲频率增加至lOHz时，合金的初生相最为细小，第二相分布最均匀，含量最高。随着磁感应强度或脉冲频率的增加，合金的抗拉强度和伸长率总体上逐渐提高；当磁感应强度为o．25T时，合金的抗拉强度和伸长率较常规条件分别提高了42．5％和106．0％。Influences of different magnetic field intensity and pulsed frequency on solidified structure and mechanical properties of Mg97 Y2 Cul alloy reinforced by long period ordered structure were investigated under direct current pulsed magnetic field （DCPMF）. The results show that morphology and volume fraction of the second phase are changed. When the magnetic field intensity is at 0～0.25 T, with the in- crease of magnetic field intensity, primary phase in the alloy is refined gradually, and the size and vol- ume fraction of second phase are increased. When the pulsed frequency is at 1～5 Hz, effects of pulsed frequency on primary phase and second phase can be ignored. With the pulsed frequency increasd to 10 Hz, the desirable refinement effect of primary phase can be observed, and the second phase with the highest volume fraction is distributed uniformly into the matrix. With the increase of magnetic field strength or pulsed frequency, both the strength and elongation of the alloy are increased gradually. When the magnetic field intensity is 0.25 T, tensile strength and elongation of the alloy are increased by 42.5% and by 106.0%, respectively, compared with the alloy in traditional condition.

关 键 词：直流脉冲磁场 Mg97Y2Cu1合金 长周期结构 凝固组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]