1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China 2 Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships, CSSC Huangpu Wenchong Shipbuilding Co., Ltd., Guangzhou 510715, China
The interfacial microstructure evolution, growth kinetics of the intermetallic compound (IMC) and mechanical properties of Fe/Al dissimilar metal joints were investigated by vacuum diffusion bonding. The results show that there is no IMC formed on the interface of the joint bonded at temperature of 550 ℃. When the bonding temperature exceeds 575 ℃, the interfacial region is composed of Fe2Al5 and a small amount of FeAl3, and the thickness of IMC layer increases rapidly with the increase of bonding temperature.Under the bonding time of 120 min, the shear strength of the joint increases first and then decreases with the increase of the bonding temperature, and the shear strength of the joint reaches the maximum value of 37 MPa.According to thermodynamic theory, the Gibbs free energy change of Fe2Al5 is the lowest in the range from 550 ℃ to 625 ℃, and then followed by that of FeAl3, and the generated sequence of interfacial IMC can be: Fe2Al5→FeAl3. The interfacial IMC grow in a parabolic manner as a function of bonding temperature, and its growth activation energy is 282.6 kJ·mol-1.The growth rates of IMC at the interface are 1.13× 10-14, 3.59×10-14, 1.21×10-13 m2·s-1 at 575, 600, 625 ℃ respectively.
QIU R F , YU H , SHI H X , et al. Interfacial characteristics of welded joint between aluminum alloy and stainless steel by resistance spot welding[J]. Transactions of the China Welding Institution, 2011, 32 (12): 37- 40.
MARTINSEN K , HU S J , CARLSON B , et al. Joining of dissimilar materials[J]. Cirp Annals Manufacturing Technology, 2015, 64, 679- 699.
LU Y , MAYTON E , SONG H , et al. Dissimilar metal joining of aluminum to steel by ultrasonic plus resistance spot welding-microstructure and mechanical properties[J]. Materials & Design, 2019, 165, 107585.
YANG J , OLIVEIRA J P , LI Y L , et al. Dissimilar laser techniques for joining of aluminum alloys to steels: a critical review[J]. Journal of Materials Processing Technology, 2022, 301, 117443.
WEI Z S , CUI L , HE D Y , et al. EBSD investigation of intermeta-llic compounds at interface of steel/aluminum dissimilar alloy joints produced by laser keyhole welding[J]. Journal of Materials Engineering, 2018, 46 (7): 117- 124.
HATANO R , OGURA T , MATSUDA T , et al. Relationship between intermetallic compound layer thickness with deviation and interfacial strength for dissimilar joints of aluminum alloy and stainless steel[J]. Materials Science and Engineering: A, 2018, 735, 361- 366.
WANG J M , ZHU X , LIU R Q . Micro-analysis of bonding interface of explosive welded aluminum/steel plates[J]. Journal of Materials Engineering, 2006, (11): 36- 39.
WANG C , JIANG Y , XIE J , et al. Interface formation and bonding mechanism of embedded aluminum-steel composite sheet during cold roll bonding[J]. Materials Science and Engineering: A, 2017, 708, 50- 59.
ZHANG Y , FAN Y , ZHAO X , et al. Influence of graphite morphology on phase, microstructure, and properties of hot dipping and diffusion aluminizing coating on flake/spheroidal graphite cast iron[J]. Metals, 2019, 9 (4): 450.
LI Y J , WANG J , HOLLY X . X-ray diffraction and TEM analysis of Fe-Al alloy layer in coating of new hot dip aluminised steel[J]. Materials Science & Technology, 2013, 19 (5): 657- 660.
SHEN Z B , QIU R F , SHI H X , et al. Growth mechanism of intermetallic compounds at the solid-state joining interface of aluminum/steel[J]. Transactions of the China Welding Institution, 2019, 40 (6): 58- 63.
CHEN N , MIN W , WANG H P , et al. Microstructural and mechanical evolution of Al/steel interface with Fe2Al5 growth in resistance spot welding of aluminum to steel[J]. Journal of Manufacturing Processes, 2018, 34, 424- 434.
YANG Y C , ZHANG F Y , HE J N , et al. Microstructure, growth kinetics and mechanical properties of interface layer for roll bonded aluminum-steel clad sheet annealed under argon gas protection[J]. Vacuum, 2018, 151, 189- 196.
SPRINGER H , SZCZEPANIAK A , RAABE D . On the role of zinc on the formation and growth of intermetallic phases during interdiffusion between steel and aluminum alloys[J]. Acta Materialia, 2015, 96, 203- 211.
LIU M , CAO P , ZHANG L N , et al. Study on vacuum diffusion welding between LD10 aluminum alloy and C6 stainless steel[J]. Aeronautical Manufacturing Technology, 2019, (4): 48- 52.
YAN Y B , ZHANG Z W , SHEN W , et al. Microstructure and properties of magnesium AZ31B-aluminum 7075 explosively welded composite plate[J]. Materials Science and Engineering: A, 2010, 527 (9): 2241- 2245.
LI R , YUAN T , LIU X , et al. Enhanced atomic diffusion of Fe-Al diffusion couple during spark plasma sintering[J]. Scripta Materialia, 2016, 110, 105- 108.
ZHANG Y , LONG B Z , MENG K , et al. Diffusion bonding of Q345 steel to zirconium using an aluminum interlayer[J]. Journal of Materials Processing Technology, 2019, 275, 116352.
曹永泽. 钢铝轧制复合界面化合物的抑制机理研究[D]. 沈阳: 东北大学, 2009.
CAO Y Z. Study on inhibition mechanism of the interface compounds in steel-aluminum rolling[D]. Shenyang: Northeastern University, 2009.
XU L , CUI Y Y , HAO Y L , et al. Growth of intermetallic layer in multi-laminated Ti/Al diffusion couples[J]. Materials Science and Engineering: A, 2006, 435/436 (4): 638- 647.
HUANG H G , CHEN P , JI C . Solid-liquid cast-rolling bonding (SLCRB) and annealing of Ti/Al cladding strip[J]. Materials & Design, 2017, 118, 233- 244.
SUN D , ZHANG Y , LIU Y , et al. Microstructures and mechanical properties of resistance spot welded joints of 16Mn steel and 6063-T6 aluminum alloy with different electrodes[J]. Materials & Design, 2016, 109, 596- 608.