李鹏,王景宽,秦志伟,等.TiZrNiCoNbSn高熵钎料钎焊Ti2AlNb合金接头微观组织与性能[J].精密成形工程,2025,17(4):217-225.
LI Peng,WANG Jingkuan,QIN Zhiwei,et al.Microstructure and Properties of Brazed Ti2AlNb Alloy with TiZrNiCoNbSn as High-entropy Filler Metal[J].Journal of Netshape Forming Engineering,2025,17(4):217-225. |
| TiZrNiCoNbSn高熵钎料钎焊Ti2AlNb合金接头微观组织与性能 |
| Microstructure and Properties of Brazed Ti2AlNb Alloy with TiZrNiCoNbSn as High-entropy Filler Metal |
| 投稿时间：2025-02-20 |
| DOI：10.3969/j.issn.1674-6457.2025.04.021 |
| 中文关键词: Ti2AlNb合金 真空钎焊 高熵钎料 微观组织 力学性能 |
| 英文关键词: Ti2AlNb alloy vacuum brazing high-entropy filler metal microstructure mechanical property |
| 基金项目:国家重点研发计划(2023YFB3407500);国家自然科学基金面上项目(52375313, 52275314);中央高校基本科研业务费(DUT24BK062, DUT24ZD202) |
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| 中文摘要: |
| 目的 针对传统Ti基钎料钎焊Ti2AlNb合金时易形成大量Ti-Cu、Ti-Ni等脆性金属间化合物进而导致接头性能恶化的共性难题，明晰钎焊温度对接头组织与力学性能的影响规律。方法 自主设计并制备了TiZrNiCoNbSn高熵钎料用于Ti2AlNb合金的真空钎焊连接，同时选取4个温度梯度(1 150、1 175、1 200、1 225 ℃)进行钎焊实验，采用EPMA方法对界面元素分布情况和特征相进行定性与定量分析，分别借助SEM和XRD观察接头微观组织与断口形貌、鉴定断口物相，并评定不同钎焊温度下接头的剪切强度。系统研究了不同钎焊温度下接头的微观组织形貌和力学性能，构建了“工艺参数-微观组织-力学性能”之间的映射关系。结果 不同钎焊温度下的接头均获得了冶金结合良好的界面，钎缝主要由B2、Ti2(Ni, Co)、Zr5Sn3、(Ti, Nb)ss和(Ti, Zr)(Ni, Co, Al)相组成。随着钎焊温度的升高，钎缝中脆性金属间化合物Zr5Sn3相逐渐减少，但同时过高的钎焊温度会促使接头组织粗大。在1 200 ℃/10 min的工艺条件下，接头平均剪切强度达到222.7 MPa，断裂模式为脆性断裂。结论 采用TiZrNiCoNbSn高熵钎料能够实现Ti2AlNb合金的可靠连接，升高钎焊温度可以减少钎缝中脆性金属间化合物的数量、改变其分布位置，但过高的钎焊温度会对接头产生不利影响，削弱接头的力学性能。 |
| 英文摘要: |
| To solve the common problem that a large number of brittle intermetallic compounds such as Ti-Cu and Ti-Ni are easy to be formed during brazing of Ti2AlNb alloy with traditional Ti-based filler metals, which leads to the deterioration of the joint properties, the work aims to clarify the effect of brazing temperature on the microstructure evolution and mechanical properties of the joints. The TiZrNiCoNbSn high-entropy filler metal was designed and prepared independently for vacuum brazing of Ti2AlNb alloy. At the same time, four brazing temperatures (1 150, 1 175, 1 200, 1 225 ℃) were selected. The EPMA was used for qualitative and quantitative analysis of interfacial element distribution and possible phases. With the aid of SEM and XRD, the microstructure and fracture morphology of the joints were observed, and the possible phase of the fracture surface was identified, respectively. The shear strength of the joints at different brazing temperatures was evaluated. The microstructure morphology and mechanical properties of the joints at different brazing temperatures were investigated, and the mapping relationship between the process parameters - microstructure - mechanical properties was constructed. The joints at different brazing temperatures were found to have well-bonded interfaces, and the brazed joints were mainly composed of B2, Ti2(Ni, Co), Zr5Sn3, (Ti, Nb)ss and (Ti, Zr)(Ni, Co, Al) phases. The brittle intermetallic compound Zr5Sn3 phase in the brazed joints decreased with the increasing brazing temperature. However, too high brazing temperature led to coarse microstructure of the joint. The average shear strength of the joint reached 222.7 MPa at the brazing temperature of 1 200 ℃ for 10 min. The fracture mode was a brittle fracture. The sound joints of Ti2AlNb alloys can be obtained by TiZrNiCoNbSn high-entropy filler metal. Increasing the brazing temperature can reduce the number of brittle intermetallic compounds in the brazed seam and change their distribution position. However, high brazing temperatures adversely affect the joints, weakening the mechanical properties of the joints. |
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