下压力对铝/镁搅拌摩擦焊接头组织与性能的影响
|
摘要
通过改变铝/镁搅拌摩擦焊接下压力,对6061–T6铝合金和AZ31镁合金板材进行对接焊,表征了接头宏微观组织结构,研究了组织结构与接头性能的关系。研究结果表明:当下压力为28kN时,得到最高168MPa的接头强度,此时铝/镁界面处金属间化合物层最薄,同时剧烈混合区内未出现无规则形貌的金属间化合物;随着下压力的增大,接头的力学性能呈现降低的趋势;下压力增大,使得搅拌头与待焊材料的摩擦产热升高,提高了焊接过程的热输入,使得铝/镁界面靠近底部金属间化合物层变厚且剧烈混合区内出现多相共存的混杂结构,同时界面偏上部出现形似孔洞的缺陷,降低接头性能。
The influence of microstructure on the mechanical properties of 6061-T6 aluminum alloy and AZ31 magnesium alloy FSW joints was studied by changing Z-axial force. The results show that, when the Z-axial force is28 kN, the ultimate tensile strength of Al/Mg joints can reach 168 MPa. The intermetallic compound layer at the interface is the thinnest, and there are no irregular intermetallic compounds in the severely deformed zone; The mechanical properties of the joints decrease with the increase of Z-axial force. With the increase of Z-axial force, the heat input in the welding process increases, resulting in thickening of intermetallic compound layer at the interface, the irregular structure appears in severely deformed zone and the hole-like defect appears at the upper part of the interface, which reduce the strength of the joints.
The influence of microstructure on the mechanical properties of 6061-T6 aluminum alloy and AZ31 magnesium alloy FSW joints was studied by changing Z-axial force. The results show that, when the Z-axial force is28 kN, the ultimate tensile strength of Al/Mg joints can reach 168 MPa. The intermetallic compound layer at the interface is the thinnest, and there are no irregular intermetallic compounds in the severely deformed zone; The mechanical properties of the joints decrease with the increase of Z-axial force. With the increase of Z-axial force, the heat input in the welding process increases, resulting in thickening of intermetallic compound layer at the interface, the irregular structure appears in severely deformed zone and the hole-like defect appears at the upper part of the interface, which reduce the strength of the joints.
引文
[1]ISHAK M,ISLAMM R.Weldability of A707-T651 and AZ31B dissimilar alloys by MIG welding method based on welding appearances[J].Journal of Physics:Conference Series,2014,495:1-8
[2]BANNOUR S,AUTRIC M,MASSEJ,et al.Microstructure and properties of welds between 5754 Al alloys and AZ31 Mg alloys using a Yb:YAG laser[C]//Proceedings of the20th International Symposium on High Power Laser Systems&Applications.Chengdu,2014.
[3]QI X,LIU L.Fusion welding of Feadded lap joints between AZ31B magnesium alloy and 6061 aluminum alloy by hybrid laser-tungsten inert gas welding technique[J].Materials&Design,2012,33:436-443.
[4]ZHANG Y,LUO Z,LI Y,et al.Microstructure characterization and tensile properties of Mg/Al dissimilar joints manufactured by thermo-compensated resistance spot welding with Zn interlayer[J].Materials&Design,2015,75:166-173.
[5]WANG Z,WANG H,LIU L.Study on low temperature brazing of magnesium alloy to aluminum alloy using Sn-x Zn solders[J].Materials&Design,2012,39:14-19.
[6]MISHRA R S,MA Z.Friction stir welding and processing[J].Materials Science and Engineering,2005,50(1):1-78.
[7]PRASADB L,NEELAIAH G,KRISHNA M G,et al.Joining of AZ91 Mg alloy and Al6063 alloy sheets by friction stir welding[J].Journal of Magnesium and Alloys,2018,6(1):71-76.
[8]AZIZIEH M,ALAVIJEHAS,ABBASI M,et al.Mechanical properties and microstructural evaluation of AA1100 to AZ31dissimilar friction stir welds[J].Materials Chemistry and Physics,2016,170:251-260.
[9]LIANG Z,CHEN K,WANG X,et al.Effect of tool offset and tool rotational speed on enhancing mechanical property of Al/Mg dissimilar FSW joints[J].Metallurgical and Materials Transactions A,2013,44(8):3721-3731.
[10]YAMAMOTO N,LIAO J,WATANABE S,et al.Effect of intermetallic compound layer on tensile strength of dissimilar friction-stir weld of a high strength Mg alloy and Al alloy[J].Materials Transactions,2009,50(12):2833-2838.
[11]SATO Y S,PARK S H C,MICHIUCHIM,et al.Constitutional liquation during dissimilar friction stir welding of Al and Mg alloys[J].Scripta Materialia,2004,50(9):1233-1236.
[12]SHI H,CHEN K,LIANG Z,et al.Intermetallic compounds in the banded structure and their effect on mechanical properties of Al/Mg dissimilar friction stir welding joints[J].Journal of Materials Science&Technology,2017,33(4):359-366.
[13]LV X Q,W U C S,YA N G C,et al.Weld microstructure and mechanical properties in ultrasonic enhanced friction stir welding of Al alloy to Mg alloy[J].Journal of Materials Processing Technology,2018,254:145-157
[14]LV X Q,WU C S,PADHY G K.Diminishing intermetallic compound layer in ultrasonic vibration enhanced friction stir welding of aluminum alloy to magnesium alloy[J].Materials Letters,2017,203:81-84.
[15]JI S,MENG X,LIU Z,et al.Dissimilar friction stirwelding of 6061aluminum alloy and AZ31 magnesium alloy assisted with ultrasonic[J].Materials Letters,2017,201:173-176.
[16]SHIN H S,DEL M.Analysis of interface solid-state reaction on dissimilar ultrasonic spot welding of Al-Mg alloys[J].Metals and Materials International,2017,23(3):554-561.
[17]陈峥,刘峥.厚板铝/镁合金红外热源辅助搅拌摩擦焊力学性能与组织分析[J].焊接技术,2014(9):9-11.CHEN Zheng,LIU Zheng.Mechanical properties and microstructure analysis of thick aluminum/magnesium alloy infrared heat source assisted friction stir welding[J].Welding Technology,2014(9):9-11.
[18]KUMAR K,KAILAS S V.On the role of axial load and the effect of interface position on the tensile strength of a friction stir welded aluminium alloy[J].Materials&Design,2008,29(4):791-797.
[19]ROSEA R,MANISEKAR K,BALASUBRAMANIAN V.Effect of axial force on microstructure and tensile properties of friction stir welded AZ61A magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2011,21(5):974-984.
[20]SEVVEL P,JAIGANESH V.Effects of axial force on the mechanical properties of AZ80A Mg alloy during friction stir welding[J].Materials Today:Proceedings,2017,4(2):1312-1320.
[21]SRINIVASAN R,RAME S HA,ATHITHANAMBI A.Effect of a xial force on microstructure and mechanical properties of friction stir welded squeeze cast A413 aluminium alloy[J].Materials Today:Proceedings,2018,5(5):13486-13494.
[22]FIROUZDOR V,KOU S.Al-toMg friction stir welding:Effect of positions of Al and Mg with respect to the welding Tool[J].Welding Journal,2009,88(11):213-224.
[2]BANNOUR S,AUTRIC M,MASSEJ,et al.Microstructure and properties of welds between 5754 Al alloys and AZ31 Mg alloys using a Yb:YAG laser[C]//Proceedings of the20th International Symposium on High Power Laser Systems&Applications.Chengdu,2014.
[3]QI X,LIU L.Fusion welding of Feadded lap joints between AZ31B magnesium alloy and 6061 aluminum alloy by hybrid laser-tungsten inert gas welding technique[J].Materials&Design,2012,33:436-443.
[4]ZHANG Y,LUO Z,LI Y,et al.Microstructure characterization and tensile properties of Mg/Al dissimilar joints manufactured by thermo-compensated resistance spot welding with Zn interlayer[J].Materials&Design,2015,75:166-173.
[5]WANG Z,WANG H,LIU L.Study on low temperature brazing of magnesium alloy to aluminum alloy using Sn-x Zn solders[J].Materials&Design,2012,39:14-19.
[6]MISHRA R S,MA Z.Friction stir welding and processing[J].Materials Science and Engineering,2005,50(1):1-78.
[7]PRASADB L,NEELAIAH G,KRISHNA M G,et al.Joining of AZ91 Mg alloy and Al6063 alloy sheets by friction stir welding[J].Journal of Magnesium and Alloys,2018,6(1):71-76.
[8]AZIZIEH M,ALAVIJEHAS,ABBASI M,et al.Mechanical properties and microstructural evaluation of AA1100 to AZ31dissimilar friction stir welds[J].Materials Chemistry and Physics,2016,170:251-260.
[9]LIANG Z,CHEN K,WANG X,et al.Effect of tool offset and tool rotational speed on enhancing mechanical property of Al/Mg dissimilar FSW joints[J].Metallurgical and Materials Transactions A,2013,44(8):3721-3731.
[10]YAMAMOTO N,LIAO J,WATANABE S,et al.Effect of intermetallic compound layer on tensile strength of dissimilar friction-stir weld of a high strength Mg alloy and Al alloy[J].Materials Transactions,2009,50(12):2833-2838.
[11]SATO Y S,PARK S H C,MICHIUCHIM,et al.Constitutional liquation during dissimilar friction stir welding of Al and Mg alloys[J].Scripta Materialia,2004,50(9):1233-1236.
[12]SHI H,CHEN K,LIANG Z,et al.Intermetallic compounds in the banded structure and their effect on mechanical properties of Al/Mg dissimilar friction stir welding joints[J].Journal of Materials Science&Technology,2017,33(4):359-366.
[13]LV X Q,W U C S,YA N G C,et al.Weld microstructure and mechanical properties in ultrasonic enhanced friction stir welding of Al alloy to Mg alloy[J].Journal of Materials Processing Technology,2018,254:145-157
[14]LV X Q,WU C S,PADHY G K.Diminishing intermetallic compound layer in ultrasonic vibration enhanced friction stir welding of aluminum alloy to magnesium alloy[J].Materials Letters,2017,203:81-84.
[15]JI S,MENG X,LIU Z,et al.Dissimilar friction stirwelding of 6061aluminum alloy and AZ31 magnesium alloy assisted with ultrasonic[J].Materials Letters,2017,201:173-176.
[16]SHIN H S,DEL M.Analysis of interface solid-state reaction on dissimilar ultrasonic spot welding of Al-Mg alloys[J].Metals and Materials International,2017,23(3):554-561.
[17]陈峥,刘峥.厚板铝/镁合金红外热源辅助搅拌摩擦焊力学性能与组织分析[J].焊接技术,2014(9):9-11.CHEN Zheng,LIU Zheng.Mechanical properties and microstructure analysis of thick aluminum/magnesium alloy infrared heat source assisted friction stir welding[J].Welding Technology,2014(9):9-11.
[18]KUMAR K,KAILAS S V.On the role of axial load and the effect of interface position on the tensile strength of a friction stir welded aluminium alloy[J].Materials&Design,2008,29(4):791-797.
[19]ROSEA R,MANISEKAR K,BALASUBRAMANIAN V.Effect of axial force on microstructure and tensile properties of friction stir welded AZ61A magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2011,21(5):974-984.
[20]SEVVEL P,JAIGANESH V.Effects of axial force on the mechanical properties of AZ80A Mg alloy during friction stir welding[J].Materials Today:Proceedings,2017,4(2):1312-1320.
[21]SRINIVASAN R,RAME S HA,ATHITHANAMBI A.Effect of a xial force on microstructure and mechanical properties of friction stir welded squeeze cast A413 aluminium alloy[J].Materials Today:Proceedings,2018,5(5):13486-13494.
[22]FIROUZDOR V,KOU S.Al-toMg friction stir welding:Effect of positions of Al and Mg with respect to the welding Tool[J].Welding Journal,2009,88(11):213-224.