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Fracture toughness of friction stir welded TA5 titanium alloy joint

机译：TA5钛合金搅拌摩擦焊接断裂韧性。

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摘要

Fracture toughness of friction stir welded titanium alloy joints was investigated using Compact tension (CT) toughness specimens. The fracture toughness slightly decreases to about 90% of the fracture toughness of base metal. The fracture surface was mainly ductile fracture mechanism with a large number of dimples. The crack propagation path was straight and mixed with intergranular and transgranular fracture. The stir zone of joint has a large number of fine a grains with some dislocations. For texture, the stir zone has hard orientation {0002} <1120>, the directions of cylinder and plate thickness are parallel. The reduction of fracture toughness in the stir zone is mainly related to microstructure and texture.
机译：使用紧凑拉伸（CT）韧性试样研究了搅拌摩擦焊接钛合金接头的断裂韧性。断裂韧性稍微降低至母材的断裂韧性的约90％。断裂面主要为韧性断裂机制，有大量凹坑。裂纹的传播路径是笔直的，并且混合了晶间和跨晶的断裂。接头的搅拌区有许多细小的晶粒，并具有一些位错。对于纹理，搅拌区具有硬取向{0002} <1120>，圆柱体和板的厚度方向平行。搅拌区断裂韧性的降低主要与显微组织和织构有关。

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