7050/3003铝合金复层铸坯的制备与热处理工艺研究
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摘要
采用直接冷却铸造法制备7050/3003铝合金复合铸坯,随后对其进行均匀化退火处理。使用扫描电镜、电子探针、维氏硬度仪等对铸坯界面进行组织性能分析,探究熔体浇铸温度及热处理工艺参数对界面结合质量的影响。结果表明,3003铝合金浇铸温度为720℃、7050铝合金浇铸温度为680℃时,铸坯界面清晰、无混流和明显铸造缺陷,且硬度相对较高,两种铝合金之间形成一层初生α-Al过渡层,实现了良好的冶金结合。均匀化退火后,7005合金一侧非平衡共晶组织和枝晶偏析基本消除,晶界处粗大第二相溶解,且随着退火温度的升高和保温时间的延长,复层材料界面成分分布逐渐均匀,扩散层厚度有所增加。
The 7050/3003 aluminum alloy cladding ingot was fabricated by a direct-chill casting process with subsequent homogenizing annealing treatment.The microstructure and properties of the ingot interface were characterized by SEM,EPMA and Vickers hardness tester,and the effects of melt casting temperature and process parameters of heat treatment on the inteface bonding quality of ingots were investigated.The results reveal that when the casting temperatures of 3003 and 7050 aluminum alloys are 720°C and 680°C respectively,the as-cast ingot exhibits a distinct interface with relatively high hardness,and no mixed flow phenomenon and obvious casting defects have been observed.Moreover,due to the formation of a primaryα-Al transition layer between the two aluminum alloys,a good metallurgical bonding of interface is achieved.After homogenizing annealing,the non-equilibrium eutectic structure and dendrite segregation of the 7050 alloy side are basically eliminated,and the coarse secondary phases at the grain boundary are dissolved.With the increase of annealing temperature and the elongation of holding time,the elements near the interface area of the ingot are more uniformly distributed,resulting in a wider diffusion layer.
The 7050/3003 aluminum alloy cladding ingot was fabricated by a direct-chill casting process with subsequent homogenizing annealing treatment.The microstructure and properties of the ingot interface were characterized by SEM,EPMA and Vickers hardness tester,and the effects of melt casting temperature and process parameters of heat treatment on the inteface bonding quality of ingots were investigated.The results reveal that when the casting temperatures of 3003 and 7050 aluminum alloys are 720°C and 680°C respectively,the as-cast ingot exhibits a distinct interface with relatively high hardness,and no mixed flow phenomenon and obvious casting defects have been observed.Moreover,due to the formation of a primaryα-Al transition layer between the two aluminum alloys,a good metallurgical bonding of interface is achieved.After homogenizing annealing,the non-equilibrium eutectic structure and dendrite segregation of the 7050 alloy side are basically eliminated,and the coarse secondary phases at the grain boundary are dissolved.With the increase of annealing temperature and the elongation of holding time,the elements near the interface area of the ingot are more uniformly distributed,resulting in a wider diffusion layer.
引文
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[3]王旭东,张迎晖,徐高磊.轧制法制备金属层状复合材料的研究与应用[J].铝加工,2008(3):22-25.
[4]Kahraman N,Gülen9B,Findik F.Joining of titanium/stainless steel by explosive welding and effect on interface[J].Journal of Materials Processing Technology,2005,169(2):127-133.
[5]Son I S,Lee S P,Lee J K,et al.Effect of hydro coextrusion on microstructure of duo-cast Al 3003/Al4004clad materials[J].Transactions of Nonferrous Metals Society of China,2014,24(S1):75-80.
[6]Li Y Y,Fei J,Chen W P,et al.Preparation of2024/3003 gradient materials by semi-continuous casting using double-stream-pouring technique[J].Journal of Central South University of Technology,2002,9(4):229-234.
[7]Nerl C,Wimmer M,Hoffmann H,et al.Development of a continuous composite casting process for the production of bilayer aluminium strips[J].Journal of Materials Processing Technology,2014,214(7):1445-1455.
[8]Rometsch P A,Zhang Y,Knight S.Heat treatment of 7xxx series aluminum alloys—some recent developments[J].Transactions of Nonferrous Metals Society of China,2014,24(7):2003-2017.
[9]陈锐.7050铝合金热变形特性及轧制工艺的研究[D].重庆:重庆大学,2014.
[10]王洪斌,金雪,周乐,等.二次轧制对7050铝合金铸轧板组织与性能的影响[J].特种铸造及有色合金,2016,36(12):1239-1243.
[11]Chen X,Tian W M,Li S M,et al.Effect of temperature on corrosion behavior of 3003aluminum alloy in ethylene glycol-water solution[J].Chinese Journal of Aeronautics,2016,29(4):1142-1150.
[12]李广钦,左秀荣.铸态及均匀化处理3003铝锰合金的组织和性能[J].材料热处理学报,2007,28(3):63-66.
[13]武恭,姚良均,李震夏,等.铝及铝合金材料手册[M].北京:科学出版社,1997.
[14]赵敏.3003/4004复合铝合金轧制及热处理工艺研究[D].大连:大连理工大学,2013.
[15]刘吉东,曹志强,张红亮,等.7050铝合金均匀化工艺的确定[J].机械工程材料,2009,33(8):32-35.
[16]孙建波.复层铝合金铸坯连续铸造技术研究[D].大连:大连理工大学,2011.
[17]付莹.铸造双金属复层材料制备技术及界面研究[D].大连:大连理工大学,2014.