2AlNb合金粉末，并對2種粉末的微觀組織演變和結構特征進行了分析和討論。結果表明，Ti2AlNb含量在40%（質(zhì)量分數(shù)，下同）以上的激光沉積預混合鈦合金粉末的等軸B2晶粒內(nèi)形成了許多河流狀亞晶粒結構，而Ti2AlNb含量在40%以下的粗柱狀β晶粒內(nèi)則呈現(xiàn)針狀結構。值得注意的是，降低激光功率和掃描速度可以促進亞晶粒結構的形成?；趯嶒灲Y果的分析可以推斷出，這種亞晶粒結構的形成不僅與亞晶界成分微偏析導致的O相析出有關，還與激光沉積過程中內(nèi)應力誘導的堆垛層錯密不可分。"/>

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激光沉積預混合的近α鈦合金和Ti2AlNb合金粉末中成分偏析與層錯誘導亞晶結構形成
作者:
作者單位:

1.西北工業(yè)大學 材料學院，陜西 西安 710072;2.西北工業(yè)大學 凝固技術國家重點實驗室，陜西 西安 710072;3.中國航發(fā)湖南動力機械研究所 發(fā)動機研發(fā)部，湖南 株洲 412002;4.西安歐中材料科技有限公司，陜西 西安 710018

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中圖分類號:

基金項目:

國家自然科學基金項目（51974259）,西安市科技計劃項目21ZCZZHXJS-QCY6-0008，中國航空發(fā)動機公司產(chǎn)學研合作項目HFZL2020CXY021


Formation of Sub-grain Structure Induced by Composition Segregation and Stacking Faults in Laser-Deposited Premixed Near-α Titanium Alloy and Ti2AlNb Alloy Powders
Author:
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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    摘要:

    通過激光沉積在近α鈦合金基板上制備了不同比例的預混合近α鈦合金和Ti2AlNb合金粉末，并對2種粉末的微觀組織演變和結構特征進行了分析和討論。結果表明，Ti2AlNb含量在40%（質(zhì)量分數(shù)，下同）以上的激光沉積預混合鈦合金粉末的等軸B2晶粒內(nèi)形成了許多河流狀亞晶粒結構，而Ti2AlNb含量在40%以下的粗柱狀β晶粒內(nèi)則呈現(xiàn)針狀結構。值得注意的是，降低激光功率和掃描速度可以促進亞晶粒結構的形成?；趯嶒灲Y果的分析可以推斷出，這種亞晶粒結構的形成不僅與亞晶界成分微偏析導致的O相析出有關，還與激光沉積過程中內(nèi)應力誘導的堆垛層錯密不可分。

    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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劉娜,趙張龍,劉郁麗,馮凱凱,查小暉,李璞,徐文馨,楊海鷗,賴運金.激光沉積預混合的近α鈦合金和Ti2AlNb合金粉末中成分偏析與層錯誘導亞晶結構形成[J].稀有金屬材料與工程,2024,53(12):3281~3290.[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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  • 收稿日期:2024-02-27
  • 最后修改日期:2024-04-16
  • 錄用日期:2024-05-08
  • 在線發(fā)布日期: 2024-12-19
  • 出版日期: 2024-12-16