静磁场处理对7055铝合金显微组织和性能的影响（英文）
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摘要
研究了不同静磁场强度对7055铝合金显微组织和力学性能的影响,其中,位错特征、相变、织构、拉伸性能、断口形貌和残余应力都用先进检测技术进行了分析。结果表明:试样中的位错密度随着磁感应强度B的增加而呈上升趋势,位错由原来的低能胞状向网络状转变;此外,磁场也促进了晶粒的细化和η(MgZn_2)向η'的转变,这有益于材料综合性能的提高。当B=3 T时,磁场弱化了晶粒择优取向且重新调整了晶粒结构,此时,材料获得最优性能,延伸率,残余应力,抗拉强度分别为10.5%,38 MPa,,555 MPa。断口形貌也通过扫描电镜进行了分析,其特征与材料塑性增强一致。
The mechanical properties and microstructure of 7055 alloy subjected to static magnetic fields at different magnetic induction intensities(B=0, 1, 3, 5, 7 T) were investigated. The dislocation characteristics, phase transition, textures, tensile properties, fracture morphology and residual stress were researched through advanced modern techniques. The results show that the dislocation densities in the treated samples increase with increasing the B, and a transformation of cellular dislocation to the low-energy network dislocation is observed. In addition, the magnetic field also plays a positive role in grain refinement due to the formation of sub-grains, and facilitates the common η(MgZn_2) at grain boundaries to dissolve toward internal grains and to transfer into η' phase, which contributes to the enhancement of the tensile strength and toughness of materials. At B=3 T, the magnetic field weakens the lattice distortion and causes a structural adjustment, and material performance reaches an optimal value with an elongation of 10.5%, a residual stress of 38 MPa and a tensile strength of 555 MPa. Besides, the fracture morphologies were analyzed by scanning electronic microscopy, and the fracture characteristics were in agreement with the plasticity property.
The mechanical properties and microstructure of 7055 alloy subjected to static magnetic fields at different magnetic induction intensities(B=0, 1, 3, 5, 7 T) were investigated. The dislocation characteristics, phase transition, textures, tensile properties, fracture morphology and residual stress were researched through advanced modern techniques. The results show that the dislocation densities in the treated samples increase with increasing the B, and a transformation of cellular dislocation to the low-energy network dislocation is observed. In addition, the magnetic field also plays a positive role in grain refinement due to the formation of sub-grains, and facilitates the common η(MgZn_2) at grain boundaries to dissolve toward internal grains and to transfer into η' phase, which contributes to the enhancement of the tensile strength and toughness of materials. At B=3 T, the magnetic field weakens the lattice distortion and causes a structural adjustment, and material performance reaches an optimal value with an elongation of 10.5%, a residual stress of 38 MPa and a tensile strength of 555 MPa. Besides, the fracture morphologies were analyzed by scanning electronic microscopy, and the fracture characteristics were in agreement with the plasticity property.
引文
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2 Schreiber J M,Omcikus Z R,Eden T J et al.Journal of Alloys and Compounds[J],2014,617:135
3 Sharma M M,Amateau M F,Eden T J.Acta Materialia[J],2010,58(6):2292
4 Liu S D,Li C B,Han S Q et al.Journal of Alloys and Compounds[J],2015,625(15):34
5 Rometsch P A,Zhang Y,Knight S.Transactions of Nonferrous Metals Society of China[J],2014,24(7):2003
6 Yan Liangming,Shen Jian,Li Zhoubing et al.Transactions of Nonferrous Metals Society of China[J],2013,23(3):625
7 Zhou Song,Wang Lei,Xie Liyang et al.Transactions of Nonferrous Metals Society of China[J],2016,26:938
8 Yu Hongchun,Wang Mingpu,Sheng Xiaofei et al.Journal of Alloys and Compounds[J],2013,578:208
9 Liu Shengdan,Li Chengbo,Han Suqi et al.Journal of Alloys and Compounds[J],2015,625:34
10 Li Guirong,Cheng Jiangfeng,Wang Hongming et al.Materials Research Express[J],2016,3(10):106 507
11 Urusovskaya A A,Alshits V I,Smirnov A E et al.Crystallography Reports[J],2003,48(5):796
12 Jiang Chenxi,Wang Haiyan,Chen Xiangrong et al.Electrochimica Acta[J],2013,112:535
13 Li X,Fautrelle Y,Ren Z.Acta Materialia[J],2007,55(4):1377
14 Liu Yin,Wang Qiang,Liu Tie et al.Journal of Alloys and Compounds[J],2014,590:110
15 Li Yang,Luo Zhen,Yan Fuyu et al.Materials and Design[J],2014,56:1025
16 Wang Qiang,Liu Tie,Wang Kai et al.ISIJ International[J],2010,50:1941
17 Buchachenko A L.Journal of Experimental&Theoretical Physics[J],2006,102:795
18 Urusovskaya A A,Alshits V I,Smirnov A E et al.Crystallography Reports[J],2003,48:796
19 Wang Hongming,Li Peisi,Zheng Rui et al.Acta Phys Sin[J],2015(8):295(in Chinese)
20 Li Guirong,Wang Hongming,Li Peisi et al.Acta Phys Sin[J].2015,64(14):148 102
21 Li Guirong,Xue Fei,Wang Hongming et al.Chinese Physics B[J],2016,25(10):262
22 Li Guirong,Wang Hongming,Yuan Xueting.Materials Letters[J],2013,99:50
23 Liu Shengdan,Zhang Xinming,You Jianghai et al.Special Casting&Nonferrous Alloys[J],2006,26(11):696
24 Xiong Minghua,Yan Hongge,Su Bin et al.Special Casting&Nonferrous Alloys[J],2012,32(11):1062
25 Wu S,Zhao H Y,Lu A L et al.Tsinghua Science and Technology,Natural Science Edition[J],2002,42(2):147
26 Molotskii M,Fleurov V.J Phys Chem B[J],2000,104:3812
27 Cai Yeqing,Sun Jinzhong,Liu Chengjie et al.Journal of Iron and Steel Research[J],2015,22(11):1024
28 Zheng Ziqiao,Li Hongying,Mo Zhiming.The Chinese Journal of Nonferrous Metals[J],2001,11(5):771
29 Bao Weiping,Xu Guangming,Ban Chunyan et al.Acta Physica Sinica[J],2004,53(6):2024
30 Dixit M,Mishra R S,Sankaran K K.Materials Science and Engineering A[J],2008,478(1-2):163