Abstract

The mechanical properties of a layered foam aluminum–titanium composite material produced by the filling of Al melt into molds with pore-forming fluorine fluxes and titanium fixtures are investigated. The shear strength of the composite is determined by the adhesive bond between Al and Ti as well as by the strength of the intermetallic transition layer formed at the interface of the metals. To improve the adhesive bond, titanium is coated with aluminum, and the strength of the intermetallic transition layer is enhanced by alloying it with Co through an Al melt used for aluminizing of titanium. The effect of cobalt alloying on the wetting and spreading of Al melt in titanium during the formation of a composite material is studied. It is shown that alloying with 3% Co reduces the area of spreading of aluminum over titanium. When the titanium surface is activated with the K₂TiF₆ and K₂ZrF₆ flux, the wetting of titanium with the melt increases with an increase in the cobalt content, and when activated with KF-AlF₃ eutectic, it decreases. Alloying with 2% Co increases the shear strength of the composite owing to the hardening of the intermetallic transition layer. When Ti surfaces are activated with K₂ZrF₆ flux, the shear strength of composites has the maximum value, which is due to alloying of the transition layer simultaneously with Co and Zr.

中文翻译：

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Co合金化对泡沫铝钛复合材料形成和粘附强度的影响

摘要

研究了通过将铝熔体填充到具有成孔氟通量和钛固定装置的模具中而产生的泡沫铝钛复合层状材料的机械性能。复合材料的剪切强度取决于Al和Ti之间的粘合力以及在金属界面处形成的金属间过渡层的强度。为了改善粘合性，在钛上涂铝，并通过用于钛镀铝的铝熔体与钴合金化来增强金属间过渡层的强度。研究了钴合金化对复合材料形成过程中铝熔体在钛中润湿和扩散的影响。结果表明，与3％Co合金化可减少铝在钛上的扩散面积。_在2 TiF ₆和K ₂ ZrF ₆助熔剂中，钛随着熔体的润湿性随着钴含量的增加而增加，并且当用KF-AlF ₃共晶激活时，钛的熔体润湿性降低。由于金属间过渡层的硬化，与2％Co合金化可提高复合材料的剪切强度。当用K ₂ ZrF ₆助熔剂激活Ti表面时，复合材料的剪切强度达到最大值，这是由于过渡层与Co和Zr同时合金化所致。