钛/铝激光熔钎焊接头原位 TEM 拉伸断裂行为

陈曦; 姜楠; 毕江; 姜梦; 梁静伟; 林三宝

doi:10.12073/j.hjxb.20210420001

钛/铝激光熔钎焊接头原位 TEM 拉伸断裂行为

陈曦^{1, 2,},
姜楠²,
毕江³,
姜梦^2, ,,
梁静伟²,
林三宝²

1.
哈尔滨工业大学, 机械工程博士后流动站, 哈尔滨, 150001
2.
哈尔滨工业大学, 现代焊接生产技术国家重点试验室,哈尔滨, 150001
3.
燕山大学, 先进锻压成形技术与科学教育部重点试验室, 秦皇岛, 066004

基金项目: 国家重点研发计划资助项目(2017YFB1301600)

详细信息

作者简介:
陈曦，博士，助理教授；主要从事异种材料激光焊接与连接；Email: chenxi_laser@hit.edu.cn

通讯作者:
姜梦，博士，讲师；Email: jiangmeng@hit.edu.cn.

中图分类号: TG 407
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出版历程
- 收稿日期: 2021-04-19
- 网络出版日期: 2022-01-11
- 刊出日期: 2021-11-24

In-situ TEM tensile fracture behavior of titanium/aluminum laser brazing joint

1.
Postdoctoral Mobile station of Mechanical Engineering, Harbin Institute of Technology, Harbin，150001, China
2.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin，150001, China
3.
Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education, Yanshan University, Qinhuangdao, 066004, China

摘要

摘要: 对于钛/铝异种金属熔钎焊接头，钛合金侧界面金属间化合物层的形态、厚度对接头力学性能存在显著影响.传统微观组织表征 + 宏观力学性能测试的方法无法直观获得纳米尺度下裂纹的萌生及扩展过程.基于此，采用原位TEM表征技术，对钛/铝熔钎焊接头界面金属间化合物层处的拉伸断裂行为展开研究，阐明界面金属间化合物层对接头力学性能的影响规律.结果表明，金属间化合物层物相主要以TiAl相和TiAl₃相为主，在原位TEM拉伸过程中，焊缝熔合区铝合金晶粒内部容易发生位错塞积，裂纹倾向于在位错塞积处萌生扩展.界面层不是拉伸试样的薄弱区，试样倾向于在焊缝熔合区或钛合金侧发生断裂.
- 激光焊 /
- 异种材料 /
- 金属间化合物 /
- 原位拉伸 /
- 断裂行为
Abstract: The shape and thickness of intermetallic layer (IMC) near the titanium alloy have a significant effect on the mechanical properties of titanium/aluminum dissimilar welding-brazing joints. The process of crack initiation and propagation at nanoscale cannot be obtained directly by the traditional method of microstructure characterization and macroscopic mechanical property test. Based on this, the tensile fracture behavior at the interface IMC of the titanium/aluminum fusion brazing joint was studied by in-situ TEM characterization technique to clarify the influence of the interface IMC on the mechanical properties of the joint. The results show that the main phases of IMC are TiAl and TiAl₃. During the in-situ TEM tensile process, dislocation pile-up was easy to occur at the grain boundary in the fusion zone, and the cracks tended to initiate and propagate at this location. The interfacial layer is not the weak zone of the tensile specimen, and the specimen tends to fracture in the fusion welding zone or on the side of the titanium alloy.
- laser welding /
- dissimilar materials /
- intermetallic compound /
- in-situ tension /
- fracture behavior

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图 1 原位TEM拉伸FIB沉积位置

Figure 1. FIB deposition locations of in situ TEM tensile test. (a) zigzag IMC; (b) planar IMC

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图 2 FIB试样透射电镜显微形貌

Figure 2. FIB deposition locations of in situ TEM tensile test. (a) bright field of zigzag IMC; (b) dark field of zigzag IMC; (c) bright field of planar IMC; (d) dark field of planar IMC

下载: 全尺寸图片幻灯片

图 3 IMC界面层EDS线扫描

Figure 3. EDS line scan of IMC interface layer. (a) zigzag IMC; (b) planar IMC

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图 4 锯齿状界面IMC层物相鉴定

Figure 4. Phase identification of the jagged interface IMC layer. (a) SAEA position; (b) position I; (c) position II; (d) position III

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图 5 平面状界面IMC层物相鉴定

Figure 5. Phase identification of the planar interface IMC layer. (a) SAEA position; (b) position I; (c) position II; (d) position III; (e) position IV

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图 6 变形过程中位错形态变化

Figure 6. The dislocation morphology changes during deformation. (a) location formation; (b) dislocation increase; (c) dislocation pile-up; (d) dislocation limitation

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图 7 锯齿状试样原位拉伸过程中裂纹扩展

Figure 7. Crack propagation of jagged sample during transmission in-situ tensile process. (a) crack initiation; (b) crack extension; (c) crack propagation; (d) completely broken

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图 8 平面状试样原位拉伸过程中裂纹扩展

Figure 8. Crack propagation of planar sample during transmission in-situ tensile process. (a) crack initiation; (b) crack extension; (c) crack propagation; (d) completely broken

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表 1 试验合金的化学成分(质量分数，%)

Table 1 Chemical compositions of the experimental alloy

合金 Ti Al V Mg Si Fe Cu

TC4 余量 6.21 3.93 — — 0.13 —
6061Al 0.2 余量 — 1.00 0.63 0.29 0.27

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