热挤压法制备双尺寸Al_2O_3/AZ31镁基复合材料的组织与性能
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摘要
采用热挤压法制备了双尺寸Al_2O_3颗粒增强AZ31镁基复合材料,利用光学显微镜(OM)、扫描电镜(SEM)、维氏硬度仪和电子万能拉伸试验机等研究了Al_2O_3/AZ31镁基复合材料的组织和力学性能。结果表明:经过热挤压后,双尺寸Al_2O_3颗粒均匀地分布在AZ31基体中,通过纳米颗粒对基体位错运动的钉扎作用和微米颗粒对晶粒长大的抑制作用,使复合材料的晶粒被显著细化。相比于单一尺寸,当添加双尺寸Al_2O_3颗粒时,复合材料的力学性能达到最大值,其硬度、抗拉强度和伸长率分别为85 HV、295 MPa和6.8%。
Double-sizes Al_2O_3 particles reinforced AZ31 magnesium matrix composites were prepared by hot extrusion method, and the microstructure and mechanical properties of the Al_2O_3/AZ31 magnesium matrix composites were studied by means of optical microscope(OM), scanning electron microscopy(SEM), Vickers hardness tester and electronic universal tensile tester. The results show that the double sizes Al_2O_3 particles are uniformly distributed in the AZ31 magnesium matrix after hot extrusion, and the grain size of the composites is significantly refined due to the pinning effect of nanoparticles on the dislocation movement of the matrix and the inhibition of microparticles on grain growth. Compared with the composites with the single size particles added, the mechanical properties of the composites reach the maximum when the double sizes Al_2O_3 particles are added, and its hardness, tensile strength and elongation are 85 HV, 295 MPa and 6.8%, respectively.
Double-sizes Al_2O_3 particles reinforced AZ31 magnesium matrix composites were prepared by hot extrusion method, and the microstructure and mechanical properties of the Al_2O_3/AZ31 magnesium matrix composites were studied by means of optical microscope(OM), scanning electron microscopy(SEM), Vickers hardness tester and electronic universal tensile tester. The results show that the double sizes Al_2O_3 particles are uniformly distributed in the AZ31 magnesium matrix after hot extrusion, and the grain size of the composites is significantly refined due to the pinning effect of nanoparticles on the dislocation movement of the matrix and the inhibition of microparticles on grain growth. Compared with the composites with the single size particles added, the mechanical properties of the composites reach the maximum when the double sizes Al_2O_3 particles are added, and its hardness, tensile strength and elongation are 85 HV, 295 MPa and 6.8%, respectively.
引文
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[2] 封爱成,卢雅琳,张扬,等.CaO对AZ31变形镁合金微观组织和力学性能的影响[J].材料热处理学报,2018,39(2):68-74.FENG Ai-cheng,LU Ya-lin,ZHANG Yang,et al.Effect of CaO on microstructure and mechanical properties of AZ31 wrought magnesium alloy[J].Transactions of Materials and Heat Treatment,2018,39(2):68-74.
[3] 王韬,黄晓锋,梁艳,等.颗粒增强镁基复合材料的增强复合新思路[J].热加工工艺,2008,37(20):98-103.WANG Tao,HUANG Xiao-feng,LIANG Yan,et al.New ideas of compound reinforcement of particulate reinforced magnesium matrix composite[J].Hot Working Technology,2008,37 (20):98-103.
[4] Ling L,Muránsky O,Flores-Johnson E A,et al.Effects of strain rate on the microstructure evolution and mechanical response of magnesium alloy AZ31[J].Materials Science and Engineering A,2017,684:37-46.
[5] 吴萍萍,张静静.镁基复合材料高温变形研究进展[J].材料导报,2018,32(17):3041-3050.WU Ping-ping,ZHANG Jing-jing.Advances in hot deformation studies of magnesium matrix composites[J].Materials Review,2018,32(17):3041-3050.
[6] Chen Y,Guo Y B,Gupta M,et al.A study of the dynamic compressive response of AZ31/Al2O3 nanocomposites and the influence of nanoparticles[J].International Journal of Impact Engineering,2016,89:114-123.
[7] Liu W Q,Hu X S,Wang X J,et al.Evolution of microstructure,texture and mechanical properties of SiC/AZ31 nanocomposite during hot rolling process[J].Materials and Design,2016,93:194-202.
[8] Bae S H,Jung K H,Shin Y C,et al.Development of mechanical properties in a CaO added AZ31 magnesium alloy processed by equal-channel angular pressing[J].Materials Characterization,2016,112(10):105-112.
[9] Habibnejad-Korayem M,Mahmudi R,Poole W J.Work hardening behavior of Mg-based nano-composites strengthened by Al2O3 nano-particles[J].Materials Science and Engineering A,2013,567(4):89-94.
[10] 王艳彬,陈嫚丽,赵志翔.Al2O3微粒的尺度律对镁微观组织和拉伸性能的影响[J].精密成形工程2011,3(2):15-19.WANG Yan-bin,CHEN Man-li,ZHAO Zhi-xiang.Effects on magnesium microstructure and mechanical properties of the scaling laws of Al2O3 Micro-particles[J].Journal of Netshape forming Engineering,2011,3(2):15-19.
[11] Wang X,Liu W,Hu X,et al.Microstructural modification and strength enhancement by SiC nanoparticles in AZ31 magnesium alloy during hot rolling[J].Materials Science and Engineering A,2018,715:49-61.
[12] Nie K B,Deng K K,Wang X J,et al.Influence of SiC nanoparticles addition on the microstructural evolution and mechanical properties of AZ91 alloy during isothermal multidirectional forging[J].Materials Characterization,2017,124:14-24.
[13] Shen M J,Wang X J,Ying T,et al.Characteristics and mechanical properties of magnesium matrix composites reinforced with micron/submicron/nano SiC particles[J].Journal of Alloys and Compounds,2016,686:831-840.
[14] Li J C,Nie K B,Deng K K,et al.Microstructure stability of as-extruded bimodal size SiCp/AZ91 composite[J].Materials Science and Engineering A,2014,615:489-496.
[15] Wang X J,Wang N Z,Wang L Y,et al.Processing,microstructure and mechanical properties of micro-SiC particles reinforced magnesium matrix composites fabricated by stir casting assisted by ultrasonic treatment processing[J].Materials and Design,2014,57(5):638-645.
[16] Deng K K,Wang X J,Wu Y W,et al.Effect of particle size on microstructure and mechanical properties of SiCp/AZ91 magnesium matrix composite[J].Materials Science and Engineering A,2012,543(5):158-163.
[17] 尚拴军,邓鹏辉,蔡刚毅,等.Mg17Al12热挤压细化对SiCp/AZ91复合材料组织及性能的影响[J].材料热处理学报,2017,38(11):8-13.SHANG Shuan-jun,DENG Peng-hui,CAI Gang-yi,et al.Effect of hot extrusion refinement of Mg17Al12 on microstructure and mechanical properties of SiCp/AZ91 composites[J].Transactions of Materials and Heat Treatment,2017,38(11):8-13.