镁/铝双金属固液复合界面的研究
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摘要
用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和显微硬度计等分析ZL105铝合金和Mg真空固液复合结合区的显微组织、相组成、元素分布和显微硬度。结果表明:当温度为430℃、保温60 min时,得到的ZL105/Mg双金属材料缺陷少,结合区形成3个新相层,各层组织均匀、层间结合紧密、显微硬度趋势良好,最大硬度值为287.9HV;在结合区形成Al_3Mg_2和β-Mg17Al12两种金属间化合物,新相层中的A层为α-Mg枝晶和枝晶间连续网状分布的β-Mg17Al12共晶组织,B层为富Al的α等轴细晶,C层主要为铝基固溶体和Al_3Mg_2。
The microstructure,phase composition,elements distribution and microhardness of the diffusion bonded interface layer for ZL105 aluminum/magnesium were analyzed by means of optical microscope(OM),scanning electron microscopy(SEM)and energy spectrometer(EDS),and microhardness tests. The results show that the ZL105 aluminum/magnesium bimetallic materials have fewer defects when the temperature is 430 ℃ and the holding time is 60 min. And then three new phase layers with uniform microsturcture of each layers and tight integration between layers are formed in the bonding zone. The microhardness trend is well and the maximum is 287.9 HV. The Al_3Mg_2 and β-Mg17 Al12 intermetallic compounds are formed in the bonding zone. The A layer is α-Mg dendrite and β-Mg17 Al12 eutectic structure with continuous interdendritic distribution,the B layer is an Al-rich α-equiaxed fine crystal,and the C layer is solid solutions with Al-matrix and Al_3Mg_2 phase.
The microstructure,phase composition,elements distribution and microhardness of the diffusion bonded interface layer for ZL105 aluminum/magnesium were analyzed by means of optical microscope(OM),scanning electron microscopy(SEM)and energy spectrometer(EDS),and microhardness tests. The results show that the ZL105 aluminum/magnesium bimetallic materials have fewer defects when the temperature is 430 ℃ and the holding time is 60 min. And then three new phase layers with uniform microsturcture of each layers and tight integration between layers are formed in the bonding zone. The microhardness trend is well and the maximum is 287.9 HV. The Al_3Mg_2 and β-Mg17 Al12 intermetallic compounds are formed in the bonding zone. The A layer is α-Mg dendrite and β-Mg17 Al12 eutectic structure with continuous interdendritic distribution,the B layer is an Al-rich α-equiaxed fine crystal,and the C layer is solid solutions with Al-matrix and Al_3Mg_2 phase.
引文
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[3]杜正良,刘奋军,陈少平,等.电场对AZ31B与Al连接界面扩散反应和扩散溶解层结构的影响[J].材料热处理学报,2010,31(3):102-106.
[4]许有肖,李亚江,王娟,等.Mg/Al异种金属焊接研究现状[J].现代焊接,2011(6):1-5.
[5]徐光晨,陈翌庆,Alan,等.铝合金表面处理对AM60/A390液固扩散连接界面组织及性能的影响[J].中国有色金属学报,2014(4):855-862.
[6]叶结和,杨千里,朱燕,等.5754/AZ31异种合金搅拌摩擦焊接头的组织与性能[J].江苏科技大学学报:自然科学版,2016,30(3):232-236.
[7]刘鹏,李亚江,王娟,等.Mg/Al异种材料真空扩散焊界面区域的显微组织[J].焊接学报,2004,25(5):5-8.
[8]张建,罗国强,李美娟,等.MB2-LY12扩散焊接头界面组织结构及其形成机制[J].材料研究学报,2012,26(2):138-142.
[9]赵丽敏,刘黎明,徐荣正,等.镁合金与铝合金的夹层扩散焊连接[J].焊接学报,2007,28(10):9-12.
[10]ZOU J T,LIU Y F,WANG X H,et al.Effect of melt-casting temperature on bonding zone of Cu Ni Mn Fe/30Cr Mn Si integral material[J].Advanced Materials Research,2011,148/149:664-667.
[11]邓颖,梁淑华,邹军涛,等.固/液熔接Cu W/ZL101A界面结合机理[J].稀有金属材料与工程,2017,46(3):740-746.
[12]刘彦峰,刘佳,韩茜,等.T2/2A12复合材料扩散焊接头组织与性能的研究[J].兵器材料科学与工程,2017,40(2):52-56.
[13]ZOU J T,LIU Y F,PEI L,et al.Study on interface diffusion[]ence Forum,2013,749:168-172.
[14]徐光晨,陈翌庆,刘丽华,等.La对镁/铝液固扩散连接界面组织及性能的影响[J].中国有色金属学报,2014,24(11):2743-2748.
[15]于前.AZ91镁合金/7075铝合金异种金属扩散焊的研究[D].太原:太原理工大学,2011.
[16]易杰,李落星,刘开勇,等.焊丝成分对6061-T6铝合金双脉冲MIG焊缝组织与性能的影响[J].兵器材料科学与工程,2015,38(3):26-30.
[17]CHEN T J,JIANG X D,MA Y,et al.Microstructural evolution and phase transformations during partial remelting of AZ91D magnesium alloy refined by Si C[J].Journal of Alloys&Compounds,2010,497(1/2):147-154.