热处理对A356/6082复合板界面组织及力学性能的影响
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摘要
采用液-固轧制复合技术制备A356/6082复合板,研究热处理温度对A356/6082复合板界面组织及力学性能的影响。结果表明,随着热处理温度的升高,A356铝合金一侧共晶Si组织发生颈缩、溶断、球化,并且球化现象首先在界面处发生,界面区剪切强度逐渐增大。当热处理温度为550℃时,复合界面处组织分布均匀,Si颗粒细小圆整,界面区元素得到充分扩散,元素扩散宽度约为136μm,复合板剪切强度最大值约为145MPa,复合界面在受到均匀塑性变形时,其剪切断裂方式为脆性断裂。
A356/6082 clad sheets were fabricated by liquid-solid rolling composite process.Effects of heat treatment temperature on interfacial microstructure and mechanical properties of A356/6082 clad sheet were investigated.The results reveal that the necking,melting and spheroidization of eutectic silicon on the side of A356 aluminum alloy occur with the increase of heat treatment temperature.Moreover,spheroidization first occurs at the interface of clad sheet,so the shearing strength of the interfacial zone is increased gradually.When the heat treatment temperature is 550℃,the composite interface presents uniform microstructure and the silicon particles are fine with round shape.In addition,elements in the interfacial region are fully diffused and the diffusion width is about 136μm.Interfacial shearing strength measured by push-out test is about 145 MPa.When the composite interface is subjected to uniform plastic deformation,the fracture form of the clad sheet is characterized by brittle fracture.
A356/6082 clad sheets were fabricated by liquid-solid rolling composite process.Effects of heat treatment temperature on interfacial microstructure and mechanical properties of A356/6082 clad sheet were investigated.The results reveal that the necking,melting and spheroidization of eutectic silicon on the side of A356 aluminum alloy occur with the increase of heat treatment temperature.Moreover,spheroidization first occurs at the interface of clad sheet,so the shearing strength of the interfacial zone is increased gradually.When the heat treatment temperature is 550℃,the composite interface presents uniform microstructure and the silicon particles are fine with round shape.In addition,elements in the interfacial region are fully diffused and the diffusion width is about 136μm.Interfacial shearing strength measured by push-out test is about 145 MPa.When the composite interface is subjected to uniform plastic deformation,the fracture form of the clad sheet is characterized by brittle fracture.
引文
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[3]于九明,孝云祯,王群骄,等.金属层状复合技术及其新进展[J].材料研究学报,2000,14(1):12-16.
[4] FENG J,YE B,ZUO L,et al.Bonding of aluminum alloys in compound casting[J].Metallurgical&Materials Transactions,2017,A48(10):4 632-4 644.
[5] HUANG H G,DONG Y K,YAN M,et al.Evolution of bonding interface in solid-liquid cast-rolling bonding of Cu/Al clad strip[J].Transactions of Nonferrous Metals Society of China,2017,27(5):1 019-1 025.
[6]李小兵,祖国胤,王平.退火温度对异步轧制铜/铝复合板界面组织及力学性能的影响[J].中国有色金属学报,2013,23(5):1 202-1 207.
[7] HE K,ZHAO J,LI P,et al.Investigation on microstructures and properties of arc-sprayed-Al/AZ91D bimetallic material by solidliquid compound casting[J].Materials&Design,2016,112:553-564.
[8] MACWAN A,JIANG X Q,LI C,et al.Effect of annealing on interface microstructures and tensile properties of rolled Al/Mg/Al tri-layer clad sheets[J].Materials Science&Engineering,2013,A587:344-351.
[9] RBNER M,GNZL M,KRNER C,et al.Aluminium-aluminium compound fabrication by high pressure die casting[J].Materials Science&Engineering,2011,A528(22-23):7 024-7 029.
[10]陈泽军,刘庆,王国军,等.1100/7075/1100复合板热轧复合和热处理工艺[J].材料热处理学报,2015,36(6):154-158.
[11]白允强,邓家爱,王章忠,等.热处理对2205-Q345爆炸复合板界面组织和性能的影响[J].金属热处理,2011,36(11):60-62.
[12]刘胜胆,陈小连,张端正,等.固溶温度对6082铝合金显微组织与性能的影响[J].中国有色金属学报,2015,25(3):582-588.
[13]程晓农,戴起勋,邵红红.材料固态相变与扩散[M].北京:化学工业出版社,2006.
[14]黄亚博,王文焱,谢敬佩,等.退火温度对铸轧成形宽幅层状铜-铝复合板界面组织及力学性能的影响[J].金属热处理,2017,42(8):114-118.
[15]陈天赐,李元东,李明,等.浇注温度对固-液轧制A356/2024板材复合界面的影响[J].特种铸造及有色合金,2018,38(3):295-299.
[16]马艳彦,池成忠,林鹏,等.5052/AZ31/5052镁铝复合板成形极限及界面扩散行为[J].稀有金属材料与工程,2016,45(8):2 086-2 091
[17] JIANG W,LI G,WU Y,et al.Effect of heat treatment on bonding strength of aluminum/steel bimetal produced by a compound casting[J].Journal of Materials Processing Technology,2018,258:239-250.
[18]李增贝.Mg/Al双金属液固复合连接的研究[D].哈尔滨:哈尔滨工程大学,2014.
[19] OGRIS E,WAHLEN A,LCHINGER H,et al.On the silicon spheroidization in Al-Si alloys[J].Journal of Light Metals,2002,2(4):263-269.
[20]宋谋胜,龙禹.固溶处理温度对A356铝合金组织和力学性能的影响[J].铸造技术,2013,34(7):814-817.
[21] LIU G,WANG Q,LIU T,et al.Effect of T6heat treatment on microstructure and mechanical property of 6101/A356 bimetal fabricated by squeeze casting[J].Materials Science&Engineering,2017,A696:208-215.