液-固复合铸造AZ91D/0Cr19Ni9双金属复合材料的显微组织和力学性能（英文）
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摘要
采用液-固复合铸造技术制备未经表面处理和经热浸镀铝表面处理的AZ91D/0Cr19Ni9双金属复合材料,研究铝涂层对AZ91D/0Cr19Ni9界面显微组织和力学性能的影响。结果表明:镁合金和裸钢0Cr19Ni9之间为机械结合,结合界面处存在一缝隙;而镁合金AZ91D和镀铝钢0Cr19Ni9之间形成冶金结合,且镁合金AZ91D/镀铝钢0Cr19Ni9界面可以分为两个不同的金属间化合物层:层Ⅰ主要由α-Mg+β-Mg_(17)Al_(12)共晶组织和少量的MgAl_2O_4相组成,层Ⅱ主要由Fe_2Al_5金属间化合物组成。此外,结合界面的硬度明显高于镁合金基体AZ91D的硬度,层Ⅰ和层Ⅱ的平均硬度分别为HV158和HV493。镁合金AZ91D/镀铝钢0Cr19Ni9界面的剪切强度高于镁合金AZ91D/裸钢0Cr19Ni9界面的剪切强度,这证明在液-固复合铸造过程中铝涂层能提高镁合金AZ91D和钢0Cr19Ni9之间的结合强度。
The liquid-solid compound casting technology was used to produce the AZ91D/0Cr19Ni9 bimetal composite without and with hot dipping aluminium, respectively. The influences of Al coating on microstructures and mechanical properties of AZ91D/0Cr19Ni9 interface were investigated. The results showed that the mechanical bonding was obtained between AZ91D and bare steel 0Cr19Ni9 where a gap existed at the interface; the metallurgical bonding was formed between AZ91D and Al-coated 0Cr19Ni9, which could be divided into two different intermetallic layers: layer Ⅰ was mainly composed of α-Mg+β-Mg_(17)Al_(12) eutectic structure and a small amount of MgAl_2O_4, and layer Ⅱ mainly comprised of Fe_2Al_5 intermetallic compound. Furthermore, the hardness value of interface was obviously higher than that of AZ91D matrix, and the average hardness values of layers Ⅰ and Ⅱ were HV 158 and HV 493, respectively. The shear strength of AZ91D/Al-coated 0Cr19Ni9 interface was higher than that of AZ91D/bare 0Cr19Ni9 interface, which confirmed that Al coating could improve the adhesive strength between AZ91D and 0Cr19Ni9 during liquid-solid compound casting process.
The liquid-solid compound casting technology was used to produce the AZ91D/0Cr19Ni9 bimetal composite without and with hot dipping aluminium, respectively. The influences of Al coating on microstructures and mechanical properties of AZ91D/0Cr19Ni9 interface were investigated. The results showed that the mechanical bonding was obtained between AZ91D and bare steel 0Cr19Ni9 where a gap existed at the interface; the metallurgical bonding was formed between AZ91D and Al-coated 0Cr19Ni9, which could be divided into two different intermetallic layers: layer Ⅰ was mainly composed of α-Mg+β-Mg_(17)Al_(12) eutectic structure and a small amount of MgAl_2O_4, and layer Ⅱ mainly comprised of Fe_2Al_5 intermetallic compound. Furthermore, the hardness value of interface was obviously higher than that of AZ91D matrix, and the average hardness values of layers Ⅰ and Ⅱ were HV 158 and HV 493, respectively. The shear strength of AZ91D/Al-coated 0Cr19Ni9 interface was higher than that of AZ91D/bare 0Cr19Ni9 interface, which confirmed that Al coating could improve the adhesive strength between AZ91D and 0Cr19Ni9 during liquid-solid compound casting process.
引文
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[3]TAN C W,CHEN B,SONG X G,ZHOU L,MENG S H,LI L Q,FENG J C.Influence of Al interlayer thickness on laser welding of Mg/steel[J].Welding Journal,2016,95(S):s384-s394.
[4]BAKER H,OKAMOTO H.ASM handbook:Alloy phase diagrams[M].Vol.3.Ohio:American Society for Metals,1992:151-153.
[5]LIU L M,ZHAO X.Study on the weld joint of Mg alloy and steel by laser-GTA hybrid welding[J].Materials Characterization,2008,59(9):1279-1284.
[6]FENG Yue-qiao,LI Yang,LUO Zhen,LING Zhan-xiang,WANGZheng-ming.Resistance spot welding of Mg to electro-galvanized steel with hot-dip galvanized steel interlayer[J].Journal of Materials Processing Technology,2016,236:114-122.
[7]LIU L,XIAO L,CHEN D L,FENG J C,KIM S,ZHOU Y.Microstructure and fatigue properties of Mg-to-steel dissimilar resistance spot welds[J].Materials&Design,2013,45:336-342.
[8]SCHNEIDER C,WEINBERGER T,INOUE J,KOSEKI T,ENZINGER N.Characterisation of interface of steel/magnesium FSW[J].Science&Technology of Welding&Joining,2013,16(1):100-107.
[9]JANA S,HOVANSKI Y.Fatigue behaviour of magnesium to steel dissimilar friction stir lap joints[J].Science&Technology of Welding&Joining,2012,17(2):141-145.
[10]LI Li-qun,CHEN Yan-bin,GUO Wei,HU Xin-bin.Influence of Zn coating on interfacial reactions and mechanical properties during laser welding-brazing of Mg to steel[J].Metallurgical&Materials Transactions A,2012,43(12):4740-4754.
[11]TAN Cai-wang,LI Li-qun,CHEN Yan-bin,GUO Wei.Interfacial microstructure and fracture behavior of laser welded-brazed Mg alloys to Zn-coated steel[J].International Journal of Advanced Manufacturing Technology,2013,68(5-8):1179-1188.
[12]YUAN Xin-jian,SHENG Guang-min,LUO Jun,LI Jia.Microstructural characteristics of joint region during diffusionbrazing of magnesium alloy and stainless steel using pure copper interlayer[J].Transactions of Nonferrous Metals Society of China,2013,23(3):599-604.
[13]WANG Xiao-yong,SUN Da-qian,YIN Shi-qiang,LIU Dong-yang.Microstructures and mechanical properties of metal inert-gas arc welded Mg-steel dissimilar joints[J].Transactions of Nonferrous Metals Society of China,2015,25(8):2533-2542.
[14]FENG Jian,YE Bing,ZUO Li-jie,WANG Qu-dong,WANG Qi-gui,JIANG Hai-yan,DING Wen-jiang.Bonding of aluminum alloys in compound casting[J].Metallurgical&Materials Transactions A,2017,48(10):4632-4644.
[15]AKBARIFAR M,DIWANDARI M.On the interfacial characteristics of compound cast Al/brass bimetals[J].International Journal of Metalcasting,2016,11(3):1-7.
[16]HU Yuan,CHEN Yi-qing,LI Li,HU Huang-dong,ZHU Zi-ang.Microstructure and properties of Al/Cu bimetal in liquid-solid compound casting process[J].Transactions of Nonferrous Metals Society of China,2016,26(6):1555-1563.
[17]HAJJARI E,RAZAVI S H,EMAMI S M,HOMMA T,KAMADO S.Dissimilar joining of Al/Mg light metals by compound casting process[J].Journal of Materials Science,2011,46(20):6491-6499.
[18]JIANG Wen-ming,FAN Zi-tian,LI Chi.Improved steel/aluminum bonding in bimetallic castings by a compound casting process[J].Journal of Materials Processing Technology,2015,226:25-31.
[19]HO J S,LIN C B,LIU C H.Effect of continuous cooling heat treatment on interface characteristics of S45C/copper compound casting[J].Journal of Materials Science,2004,39(7):2473-2480.
[20]HE Ke,ZHAO Jian-hua,LI Pu,HE Jian-sheng,TANG Qi.Investigation on microstructures and properties of arc-sprayed-Al/AZ91D bimetallic material by solid-liquid compound casting[J].Materials&Design,2016,112:553-564.