轧制对爆炸焊接TA1/5052与TA1/1060/5052复合板组织与性能的影响

Effect of rolling on microstructure and properties of explosive welding TA1/5052 and TA1/1060/5052 composite plates

利用爆炸焊接的方法制备纯钛TA1与5052铝合金复合的TA1/5052复合板,以及加入中间层纯铝1060的TA1/1060/5052复合板,研究轧制对爆炸焊接态TA1/5052与TA1/1060/5052复合板组织与性能的影响,以及加入中间层对复合板界面的影响。结果表明:爆炸焊接态的TA1/5052与TA1/1060/5052复合板界面结合良好,在退火后其界面的组织主要为α-Ti、α-Al以及钛铝金属间化合物TiAl3;复合板硬度较钛、铝原始板材有较大的提升,同时具有良好的拉伸与弯曲性能,并且在力学性能测试过程中不发生分层。轧制后,由于轧制下压力的作用,导致复合板扩散层厚度下降,微观组织发生变化,界面附近的晶粒被挤压变形,并在进料过程中被逐渐拉长,呈现出纤维状组织,且轧制过程中产生强烈的加工硬化,导致复合板的抗拉强度与显微硬度增加。加入中间层可以明显改善复合板的界面形貌,抑制界面处Ti/Al金属间化合物的形成。

TA1/5052 composite plate composed of pure titanium TA1 and 5052 aluminum alloy and TA1/1060/5052 composite plate with an intermediate layer of pure aluminum 1060 were prepared by explosive welding method.The effect of rolling on microstructure and properties of the explosive welding TA1/5052 and TA1/1060/5052 composite plates was studied,and the effect of intermediate layer addition on the interface of the composite plates was studied too.The results show that the interface bonding between explosive welding TA1/5052 and TA1/1060/5052 composite plates is good,and the microstructure of the interface after annealing is mainlyα-Ti,α-Al and TiAl3 intermetallic compound.The composite plates have a significant improvement in hardness compared to the original titanium and aluminum plates,while also exhibit good tensile and bending properties,and no delamination occurs during the mechanical property testing.After rolling,due to the effect of rolling pressure,the thickness of the diffusion layer of the composite plates decreases,the microstructure changes,the grains near the interface are extruded and deformed,and gradually elongate during the feeding process,presenting a fibrous structure.In addition,strong work hardening occurs during the rolling process,leading to an increase in the tensile strength and microhardness of the composite plates.Adding an intermediate layer can significantly improve the interface morphology of the composite plates and inhibit the formation of Ti/Al intermetallic compounds at the interface.