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激光熔化沉積連接鈦-鋁異質(zhì)合金工藝及組織性能研究
作者:
作者單位:

1.沈陽航空航天大學(xué)機電工程學(xué)院;2.中國科學(xué)院沈陽自動化研究所

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中圖分類號:

基金項目:

國家重點研發(fā)計劃（項目號：NO.2022YFB4602203），遼寧省博士科研啟動基金計劃項目（項目號：NO.2022-BS-026）,內(nèi)蒙古自治區(qū)重點研發(fā)和成果轉(zhuǎn)化計劃項目(項目號：NO.2023KJHZ0029)


Study on the process and microstructure properties of titanium-aluminum heteroalloy connected by laser melting deposition
Author:
Affiliation:

1.School of Mechanical and Electrical Engineeing,Shenyang Aerospace University;2.School of Mechanical and Electrical Engineeing,Shenyang Aerospace University, Shenyang;3.Shenyang Institute of Automation,Chinese Academy of Sciences

Fund Project:

National Key RESEARCH and Development Plan (Project No.: NO.2022YFB4602203), Liaoning Province doctoral Research Launch Fund Project (Project No.: NO.2022-BS-026), Inner Mongolia Autonomous Region Key Research and Development and Achievement Transformation Project of Inner Mongolia Autonomous Region (Project No.: NO.2023KJHZ0029)

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    摘要:

    目的 解決物性參數(shù)差異大的TC4-7075異質(zhì)合金的連接難題，拓展高比強度鈦-鋁異質(zhì)合金復(fù)合結(jié)構(gòu)的應(yīng)用范圍。方法 選用AlTiVNbSi高熵合金為中間層材料，采用激光熔化沉積技術(shù)實現(xiàn)了TC4和AA7075異質(zhì)合金的有效連接，采用金相顯微鏡（OM）、掃描電子顯微鏡（SEM、EBSD）、顯微硬度以及拉伸實驗等檢測方法，對連接區(qū)的宏觀形貌、微觀組織、成分分布以及界面特性等微觀特征進行了表征。結(jié)果 連接接頭與TC4鈦合金側(cè)界面結(jié)合良好，存在寬度約為20μm的界面過渡區(qū)，靠近界面的TC4有集束魏氏組織產(chǎn)生，7075側(cè)界面存在寬度為20μm的化合物區(qū)。結(jié)論 基于高熵合金的以AlTiVNbSi為中間層材料，采用激光熔化沉積技術(shù)可實現(xiàn)鈦-鋁異質(zhì)合金的有效連接，連接接頭硬度約為696HV，高于母材硬度，近鈦側(cè)連接區(qū)硬度高于近鋁側(cè)連接區(qū)硬度，抗拉強度為116MPa。

    Abstract:

    Objective To solve the connection problem of TC4-7075 heteroalloy with large differences in physical parameters, and to expand the application range of high specific strength titanium-aluminum heteroalloy composite structure. Methods AlTiVNbSi high-entropy alloy was selected as the intermediate layer material, and the effective connection of TC4 and AA7075 heteroalloys was realized by laser melting deposition technology, and the macromorphology, microstructure, component distribution and interface characteristics of the junction area were characterized by metallographic microscopy (OM), scanning electron microscopy (SEM, EBSD), microhardness and tensile experiment. Results The connection joint is well combined with the TC4 titanium alloy side interface, and there is an interface transition zone with a width of about 20μm, TC4 near the interface has bundled Weisler tissue, and a compound area with a width of 20μm exists at the 7075 side interface. Conclusion Based on AlTiVNbSi as the intermediate layer material of high-entropy alloy, laser melting deposition technology can realize the effective connection of titanium-aluminum heteroalloy, the hardness of the joint is about 696HV, which is higher than the hardness of the base metal, the hardness of the connecting zone on the near titanium side is higher than that of the connecting zone on the aluminum side, and the tensile strength is 116MPa.

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尚曉峰,孫晨,趙宇輝,賀晨,趙吉賓.激光熔化沉積連接鈦-鋁異質(zhì)合金工藝及組織性能研究[J].稀有金屬材料與工程,2024,53(12):3493~3502.[Shang Xiaofeng, Sun Chen, Zhao Yuhui, He Chen, Zhao Jibin. Study on the process and microstructure properties of titanium-aluminum heteroalloy connected by laser melting deposition[J]. Rare Metal Materials and Engineering,2024,53(12):3493~3502.]
DOI：10.12442/j. issn.1002-185X.20230667

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  • 收稿日期:2023-10-25
  • 最后修改日期:2023-11-17
  • 錄用日期:2023-11-17
  • 在線發(fā)布日期: 2024-12-23
  • 出版日期: 2024-12-16