磁场电流对AZ31镁合金组织与性能的影响
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摘要
为了改善AZ31镁合金的综合性能并提高其利用价值,通过在AZ31镁合金整个凝固过程施加旋转磁场制备镁合金管坯.通过改变磁场电流对磁场与自然凝固条件下获得的AZ31镁合金铸锭的微观组织及力学性能进行了观察与测试,研究了磁场电流对AZ31镁合金显微组织和力学性能的影响.结果表明,随着磁场电流的增大,合金晶粒逐渐细化,晶粒内部出现较多的孪晶,且β-Mg17Al12相逐渐减少并细化.磁场电流越大,AZ31镁合金的力学性能越好.当磁场电流为150 A时,AZ31镁合金的抗拉强度为194 MPa,屈服强度为98 MPa,伸长率为14. 8%,与自然凝固状态相比分别提高了23. 6%、32. 4%和57. 4%.
In order to improve the comprehensive performance of AZ31 magnesium alloy and enhance its utilization value,the magnesium alloy tube was prepared by applying a rotating magnetic field during the whole solidification process of AZ31 magnesium alloy. Through changing the magnetic field current,the microstructure and mechanical properties of AZ31 magnesium alloy ingot under the conditions of both magnetic field and natural solidification were observed and tested. The effect of magnetic field current on the microstructure and mechanical properties of AZ31 magnesium alloy was investigated. The results showthat with increasing the magnetic field current,the grains of the alloy are gradually refined,more twins appear in the interior of the grains,and the β-Mg17 Al12 phase gradually reduces and gets refined. When the magnetic field current is 150 A,the ultimate tensile strength of AZ31 magnesium alloy is 194 MPa,the yield strength is 98 MPa,and the elongation is 14. 8%,which increase by 23. 6%,32. 4% and 57. 4% than those of the alloy at the natural solidification state,respectively.
In order to improve the comprehensive performance of AZ31 magnesium alloy and enhance its utilization value,the magnesium alloy tube was prepared by applying a rotating magnetic field during the whole solidification process of AZ31 magnesium alloy. Through changing the magnetic field current,the microstructure and mechanical properties of AZ31 magnesium alloy ingot under the conditions of both magnetic field and natural solidification were observed and tested. The effect of magnetic field current on the microstructure and mechanical properties of AZ31 magnesium alloy was investigated. The results showthat with increasing the magnetic field current,the grains of the alloy are gradually refined,more twins appear in the interior of the grains,and the β-Mg17 Al12 phase gradually reduces and gets refined. When the magnetic field current is 150 A,the ultimate tensile strength of AZ31 magnesium alloy is 194 MPa,the yield strength is 98 MPa,and the elongation is 14. 8%,which increase by 23. 6%,32. 4% and 57. 4% than those of the alloy at the natural solidification state,respectively.
引文
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[9]徐志佳.电磁搅拌对AZ91镁合金材料组织性能的影响[J].铸造技术,2014,35(2):349-350.(XU Zhi-jia. Effect of electromagnetic stirring on microstructure and properties of AZ91 magnesium alloy[J]. Foundry Technology,2014,35(2):349-350.)
[10]Du Y,Wu Y,Peng L,et al. Formation of lamellar phase w ith 18R-type LPSO structure in an as-cast M g96Gd3Zn1(at%)alloy[J]. M aterials Letters,2016,169(5):168-171.
[2]于金程,刘正,董阳,等.高应变速率下Mg-Gd-Y镁合金动态拉伸性能与疲劳行为[J].沈阳工业大学学报,2015,37(6):650-655.(YU Jin-cheng,LIU Zheng,DONG Yang,et al. Dynamic tensile properties and failure behavior of Mg-Gd-Y alloy at high strain rates[J]. Journal of Shenyang University of Technology,2015,37(6):650-655.)
[3]汤伊金,章桢彦,靳丽,等. Mg-Gd系合金时效析出研究进展[J].中国有色金属学报,2014,24(1):8-22.(TANG Yi-jin,ZHANG Zhen-yan,JIN Li,et al. Research progress on ageing precipitation of M g-Gd alloys[J]. The Chinese Journal of Nonferrous Metals,2014,24(1):8-22.)
[4]毛萍莉,刘遵鑫,刘正,等.晶粒大小对AZ31镁合金绝热剪切敏感性的影响[J].沈阳工业大学学报,2015,37(5):494-499.(MAO Ping-li,LIU Zun-xin,LIU Zheng,et al. Effect of grain size on adiabatic shear sensitivity of AZ31magnesium alloy[J]. Journal of Shenyang University of Technology,2015,37(5):494-499.)
[5]赵少飞,杨海西.电磁搅拌技术在板坯连铸中的应用[J].河北冶金,2012(5):37-38.(ZHAO Shao-fei,YAGN Hai-xi. Application of electromagnetic stirring technology in slab continuous casting[J]. Hebei M etallurgy,2012(5):37-38.)
[6]包卫平,许光明,郑佳伟,等.不同磁场作用对AZ31镁合金的凝固组织的影响[J].材料与冶金学报,2003,2(3):216-219.(BAO Wei-ping,XU Guang-ming,ZHENG Jia-wei,et al. Effect of different magnetic field on solidification structure of AZ31 magnesium alloy[J]. Journal of M aterials and M etallurgy,2003,2(3):216-219.)
[7]王刘波,李继高.旋转磁场对稀土镁合金组织和性能的影响[J].热加工工艺,2010,39(11):88-90.(WANG Liu-bo,LI Ji-gao. Effect of rotating magnetic field on microstructure and properties of rare earth magnesium alloy[J]. Hot Working Technology,2010,39(11):88-90.)
[8]黄曼青,周全.直流磁场对AZ31镁合金凝固组织和力学性能的影响[J].热加工工艺,2016,45(13):77-80.(HUANG Man-qing,ZHOU Quan. Effect of DC magnetic field on solidification structure and mechanical properties of AZ31 magnesium alloy[J]. Hot Working Technology,2016,45(13):77-80.)
[9]徐志佳.电磁搅拌对AZ91镁合金材料组织性能的影响[J].铸造技术,2014,35(2):349-350.(XU Zhi-jia. Effect of electromagnetic stirring on microstructure and properties of AZ91 magnesium alloy[J]. Foundry Technology,2014,35(2):349-350.)
[10]Du Y,Wu Y,Peng L,et al. Formation of lamellar phase w ith 18R-type LPSO structure in an as-cast M g96Gd3Zn1(at%)alloy[J]. M aterials Letters,2016,169(5):168-171.