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首页> 外文期刊>Materials Science and Engineering >Characterization of wire arc additively manufactured titanium aluminide functionally graded material: Microstructure, mechanical properties and oxidation behaviour
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Characterization of wire arc additively manufactured titanium aluminide functionally graded material: Microstructure, mechanical properties and oxidation behaviour

机译：电弧添加添加剂制造的铝化钛功能梯度材料的表征：显微组织，力学性能和氧化行为

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摘要

In this paper, titanium-aluminide functionally graded material with a designed composition range from pure Ti to Ti-50 at% Al is successfully fabricated using the double-wire arc additive manufacturing method (WAAM). Due to the influence of Al concentration, the morphology, microstructure, mechanical properties and oxidation behaviour vary greatly along the gradient direction of the manufactured bulk. With increasing Al content from the bottom to the top, the bulk exhibits a layered structure consisting of α–β duplex structure, α-α2lamellar structure, large α2grains, α2-γ duplex lamellar structure and γ interdendrities structure in sequence from the bottom to the top. Microhardness and tensile strength exhibit similar trends and are comparable to those of mono-composition components. The oxidation resistance degrades at an increasing rate with decreasing Al content due to oxide breakaway occurring in the TiAl alloy matrix that consists of single α2or α2+ α. The experimental results indicate that the WAAM method is able to produce defect free TiAl functionally graded material with the desired composition gradient, suitable mechanical properties and acceptable oxidation behaviour.
机译：在本文中，使用双线电弧增材制造法（WAAM）成功制造了设计成分从纯Ti到Ti-50％at Al的铝化钛功能梯度材料。由于铝浓度的影响，其形貌，微观结构，力学性能和氧化行为沿所制造块体的梯度方向变化很大。随着铝含量从下到上的增加，块体呈现出由下往上依次由α-β双相结构，α-α2片状结构，大α2晶粒，α2-γ双相层状结构和γ中间结构组成的层状结构。最佳。显微硬度和抗张强度表现出相似的趋势，并且与单组分组分的趋势相当。由于在由单个α2或α2+α组成的TiAl合金基体中发生的氧化物分解，因此随着Al含量的减少，抗氧化性会以增加的速率降低。实验结果表明，WAAM方法能够生产具有所需组成梯度，合适的机械性能和可接受的氧化行为的无缺陷TiAl功能梯度材料。

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