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Home > Archive>Volume 53, Issue 12, 2024 >3281-3290. DOI:10.12442/j.issn.1002-185X.20240097
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Formation of Sub-grain Structure Induced by Composition Segregation and Stacking Faults in Laser-Deposited Premixed Near-α Titanium Alloy and Ti2AlNb Alloy Powders
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Affiliation:

1.School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an710072, China;2.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an710072, China;3.Engine Development Department, AECC Hunan Aviation Powerplant Research Institute, Zhuzhou412002, China;4.Xi 'an Sino-Euro Materials Technologies Co., Ltd, Xi 'an710018, China

Fund Project:

National Natural Science Foundation of China (51974259); Xi'an Municipal Bureau of Science and Technology (21ZCZZHXJS-QCY6-0008); Industry-Academic Cooperation Project of Aero Engine Corporation of China (HFZL2020CXY021)

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    Abstract:

    Near-α titanium alloy and Ti2AlNb alloy powders premixed with different proportions were prepared on the near-α titanium alloy substrate by laser deposition technique, and the microstructure characteristics were analyzed and discussed. Results show that numerous river-like sub-grain structures are formed inside the equiaxed B2 grains of the laser-deposited premixed titanium alloy powders with the proportion of Ti2AlNb above 40wt%, whereas the needle-like structure within coarse columnar β grains exist with the proportion of Ti2AlNb below 40wt%. It is noteworthy that the decrease in laser power and scanning speed can accelerate the formation of sub-grain structures. Based on the analysis of experimental results, it can be inferred that the formation of sub-grain structure not only is related to the precipitation of O phase due to composition micro-segregation at sub-grain boundaries, but also is inseparable from the stacking faults caused by the internal stress during the laser deposition.

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[Liu Na, Zhao Zhanglong, Liu Yuli, Feng Kaikai, Zha Xiaohui, Li Pu, Xu Wenxin, Yang Haiou, Lai Yunjin. Formation of Sub-grain Structure Induced by Composition Segregation and Stacking Faults in Laser-Deposited Premixed Near-α Titanium Alloy and Ti2AlNb Alloy Powders[J]. Rare Metal Materials and Engineering,2024,53(12):3281~3290.]
DOI：10.12442/j. issn.1002-185X.20240097

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History
  • Received:February 27,2024
  • Revised:April 16,2024
  • Adopted:May 08,2024
  • Online: December 19,2024
  • Published: December 16,2024

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