超声处理对Mg-9Al-Zn-0.6Ce-1.2Ca镁合金组织及耐蚀性的影响
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摘要
采用光学显微镜(OM)、X射线衍射分析(XRD)、极化曲线测试等研究了超声处理功率(0、600、650、700、750 W)对Mg-9Al-Zn-0.6Ce-1.2Ca合金组织与耐蚀性能的影响。结果表明:随超声处理功率逐渐增大,Mg-9Al-Zn-0.6Ce-1.2Ca合金中α-Mg相平均晶粒尺寸先增大后减小,β-Mg_(17)Al_(12)相体积分数减少,并从连续网状变为半网状、散点状,合金耐蚀性随超声处理功率增大先增大后减小;经650 W超声处理后,合金中α-Mg相平均晶粒尺寸降至最低,相比于未进行超声处理的合金,降低了52.7%,β-Mg_(17)Al_(12)相呈半网状、散点状,此时合金的耐腐蚀性能最佳。
Effect of ultrasonic treatment power(0, 600, 650, 700 and 750 W) on microstructure and corrosion resistance of Mg-9Al-Zn-0.6Ce-1.2Ca alloy was studied by means of optical microscope(OM), X-ray diffraction(XRD) and polarization curve measurement. The results show that with the increase of ultrasonic power, the average grain size of α-Mg phase in the Mg-9Al-Zn-0.6Ce-1.2Ca alloy first increases and then decreases, and the volume fraction of β-Mg_(17)Al_(12) phase decreases gradually, the morphology of the β-Mg_(17)Al_(12) phase changes from continuous network to discontinuous network and scattered dots. The corrosion resistance of the alloy first increases and then decreases with the increase of ultrasonic power. After ultrasonic treatment of 650 W, the average grain size of α-Mg phase in the alloy decreases to the lowest. Compared with the alloy without ultrasonic treatment, the average grain size of α-Mg phase decreases by 52.7%, and the β-Mg_(17)Al_(12) phase shows a discontinuous network and scattered dots. In such cases, the corrosion resistance of the alloy is the best.
Effect of ultrasonic treatment power(0, 600, 650, 700 and 750 W) on microstructure and corrosion resistance of Mg-9Al-Zn-0.6Ce-1.2Ca alloy was studied by means of optical microscope(OM), X-ray diffraction(XRD) and polarization curve measurement. The results show that with the increase of ultrasonic power, the average grain size of α-Mg phase in the Mg-9Al-Zn-0.6Ce-1.2Ca alloy first increases and then decreases, and the volume fraction of β-Mg_(17)Al_(12) phase decreases gradually, the morphology of the β-Mg_(17)Al_(12) phase changes from continuous network to discontinuous network and scattered dots. The corrosion resistance of the alloy first increases and then decreases with the increase of ultrasonic power. After ultrasonic treatment of 650 W, the average grain size of α-Mg phase in the alloy decreases to the lowest. Compared with the alloy without ultrasonic treatment, the average grain size of α-Mg phase decreases by 52.7%, and the β-Mg_(17)Al_(12) phase shows a discontinuous network and scattered dots. In such cases, the corrosion resistance of the alloy is the best.
引文
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[2] 中国有色金属工业协会专家委员会组织编写.中国镁业[M].北京:冶金工业出版社,2013.
[3] Yang M,Liu Y H,Liu J A,et al.Corrosion and mechanical properties of AM50 magnesium alloy after being modified by 1 wt.% rare earth element gadolinium[J].Journal of Rare Earths,2014,32(6):558-563.
[4] Wu D G,Yan S H,Wang Z Q,et al.Effect of samarium on microstructure and corrosion resistance of aged as-cast AZ92 magnesium alloy[J].Journal of Rare Earths,2014,32(7):663-671.
[5] Chen Y A,Li J,Fang D,et al.Effects of calcium,samarium addition on microstructure and mechanical properties of AZ61 magnesium alloy[J].Journal of Rare Earths,2015,33(1):86-92.
[6] Wang Z X,Lü W G,Chen J,et al.Characterization of ceramic coating on ZK60 magnesium alloy prepared in a dual electrolyte system by micro-arc oxidation[J].Rare Metals,2013,32(5):459-464.
[7] Baek S M,Kim H J,Jeong H Y,et al.Effect of alloyed Ca on the microstructure and corrosion properties of extruded AZ61 Mg alloy[J].Corrosion Science,2016,112:44-53.
[8] Baek S M,Kang J S,Shin H J,et al.Role of alloyed Y in improving the corrosion resistance of extruded Mg-Al-Ca-based alloy[J].Corrosion Science,2017,118:227-232.
[9] 盛夏.钙与钇对铸态AZ91D镁合金组织与性能的影响[D].哈尔滨:哈尔滨工业大学,2015.SHENG Xia.Effect of Ca and Y on microstructure and properties of as-cast AZ91D magnesium alloy[D].Harbin:Harbin Institute of Technology,2015.
[10] Liu X B,Osawa Y,Takamori S,et al.Microstructure and mechanical properties of AZ91 alloy produced with ultrasonic vibration[J].Materials Science and Engineering A,2008,487(1/2):120-123.
[11] Qian M,Ramirez A,Das A,et al.The effect of solute on ultrasonic grain refinement of magnesium alloys[J].Journal of Crystal Growth,2010,312(15):2267-2272.
[12] 李迪.Sn和超声处理对Mg-6Zn-0.5Y合金组织及性能的影响[D].重庆:重庆大学,2015.LI Di.Effect of Sn and ultrasonic treatment on microstructure and mechanical properties of Mg-6Zn-0.5Y magnesium alloy[D].Chongqing:Chongqing University,2015.
[13] Yao L,Hao H,Ji S H,et al.Effects of ultrasonic vibration on solidification structure and properties of Mg-8Li-3Al alloy[J].Transactions of Nonferrous Metals Society of China,2011,21(6):1241-1246.
[14] Liu Q M,Zhai Q J,Qi F P,et al.Effects of power ultrasonic treatment on microstructure and mechanical properties of T10 steel[J].Materials Letters,2007,61(11/12):2422-2425
[15] Khosro A M,Niroumand B,et al.Effects of ultrasonic treatment on microstructure and tensile strength of AZ91 magnesium alloy[J].Journal of Alloys and Compounds,2011,509(1):114-122.
[16] Jia Z,Zhang W M,Yang F.Effect of ultrasonic melt treatment on degassing of Mg-6Zn-1Ca alloy[J].China Foundry,2015,12(1):15-19.
[17] 贾征,乐启炽,张志强,等.超声波施振参数对 Mg-Ca 合金除气的影响[J].东北大学学报:自然科学版,2012,33 (3):385-396.JIA Zheng,LE Qi-zhi,ZHANG Zhi-qiang,et al.Effect of ultrasonic vibration parameters on degassing of Mg-Ca alloy[J].Journal of Northeastern University:Natural Science,2012,33(3):385-396.
[18] 黎正华.超声外场辅助铸造抑制7050合金宏微观偏析的实验研究[D].长沙:中南大学,2011.LI Zheng-hua.Experimental study on the suppression of macro and micro segregation of 7050 alloy by ultrasonic field assisted casting[D].Changsha:Central South University,2011.
[19] Puga H,Barbosa J,Seabra E,et al.The influence of processing parameters on the ultrasonic degassing of molten AlSi9Cu3 aluminium alloy[J].Materials Letters,2009,63(9/10):806-808.
[20] Li J W,Momono T,Fu Y,et al Effect of ultrasonic stirring on temperature distribution and grain refinement in Al-1.65%Si alloy melt[J].Transactions of Nonferrous Metals Society of Chain,2007,17(4):691-697.
[21] Hong X,Xin Z B,Zhang K,et al.Effect of extrusion on corrosion behavior and corrosion mechanism of Mg-Y alloy[J].Journal of Rare Earths,2016,34(3):315-327.Effect of ultrasonic treatment on microstructure and corrosion resistance of Mg-9Al-Zn-0.6Ce-1.2Ca magnesium alloy WANG Wu-xiao, LIU Xue-yong, WANG Na, LIU Jian, QIN Shao-yong(44)