Metals and Metal Matrix Composites |
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Microstructure and Evolution Behavior of Linear Friction Welded Joints of TA19 Titanium Alloy with Bimodal Structure |
TAO Bohao1, LI Ju2, ZHANG Yanhua1
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1 School of Mechanical Engineering & Automation, Beihang University,Beijing 100191, China 2 AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China |
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Abstract In this paper,the microstructure of linear friction welded joints of TA19 titanium alloy with bimodal structure was studied. Moreover, the defor-mation behaviors of the equiaxed primary α phase and the lamellar β transformation structure as well as the formation mechanism of the joint were analyzed. The results show that during linear friction welding, the severe and continuous thermoplastic deformation leads to a successive changing process of the bimodal structure, from structure coarsening, deformation, disintegration to a complete fragmentation, and ultimately it turns into the refined grain equiaxed structure. From heat-affected zone of welded joint to welded center, the equiaxed primary α phase undergoes discontinuous plastic deformation, fragmentation and eventually turns into β phase completely, while the lamellar β transformation structure expe-riences deformation, disintegration and ultimately a complete fragmentation.
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Published: 14 July 2020
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About author:: Bohao Tao, a doctoral student of Beihang University, mainly focusing on material processing and welding structure analysis. Yanhua Zhang, Ph.D., professor, major scientific research areas are material processing and manufactu-ring technology, advanced welding technology. |
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