Microstructure and Mechanical Properties of Pure Titanium TA2 Vacuum Brazing Joint with TiZrCuNi Powder Brazing Filler Metal

Haozhe YANG; Yinyin PEI; Jian QIN; Weimin LONG; Yuanxun SHEN; Xiupeng LI

doi:10.7512/j.issn.1001-2303.2022.06.14

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Microstructure and Mechanical Properties of Pure Titanium TA2 Vacuum Brazing Joint with TiZrCuNi Powder Brazing Filler Metal
Vol. 52, Issue 6, Pages: 112-117(2022)
Revised：2022-04-25，

Published：30 June 2022
DOI： 10.7512/j.issn.1001-2303.2022.06.14
稿件说明：

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杨浩哲，裴夤崟，秦建，等.TiZrCuNi粉状钎料真空钎焊TA2纯钛接头界面组织及力学性能［J］.电焊机，2022，52（6）：112-117. DOI： 10.7512/j.issn.1001-2303.2022.06.14.

YANG Haozhe, PEI Yinyin, QIN Jian, et al.Microstructure and Mechanical Properties of Pure Titanium TA2 Vacuum Brazing Joint with TiZrCuNi Powder Brazing Filler Metal[J].Electric Welding Machine, 2022, 52(6): 112-117. DOI： 10.7512/j.issn.1001-2303.2022.06.14.

摘要

采用Ti37.5Zr37.5Cu15Ni10粉状钎料在940 ℃×20 min工艺条件下实现了TA2商业纯钛的真空钎焊连接，利用扫描电镜（SEM）、能谱仪（EDS）、万能试验机和显微硬度计等对钎焊接头的界面组织和力学性能进行了研究和分析。结果表明，钎焊接头的典型界面结构为TA2/针状α-Ti+共析组织（α-Ti+（Ti，Zr）

（Cu，Ni））+残余钎料/TA2，Cu、Ni元素主要存在于共析组织和残余钎料中，Zr元素在共析组织、残余钎料和针状α-Ti中均有分布。钎焊接头室温抗剪强度为322 MPa，从母材向钎缝中心维氏硬度逐渐增大，钎缝中心共析组织的维氏硬度值为307 HV10，可达母材2倍以上。断口分析结果表明裂纹沿钎缝扩展，断口形貌具有沿晶韧窝、拉长韧窝和解理断裂特征，断裂呈韧性-脆性复合断裂模式。

Abstract

Vacuum brazing of commercial pure

Titanium TA2 was realized by using Ti37.5Zr37.5Cu15Ni10 powder BFM at 940 ℃×20 min. The microstructure and mechanical properties of the brazing joint were studied by scanning electron microscopy (SEM)

energy dispersive spectroscopy (EDS)

universal testing machine and microhardness tester. The results show that the typical interfacial structure of brazing joints is TA2/ acicular α-Ti+eutectoid structure (α-Ti+(Ti

Zr)

(Cu

Ni))+ residual filler metal /TA2.Cu and Ni elements mainly exist in eutectoid structure and residual filler metal

while Zr distributes in eutectoid structure

residual filler metal and acicular α-Ti. The room temperature shear strength of the brazing joint is 322 MPa. The Vickers hardness increases gradually from the base metal to the center of the brazing seam

and the eutectoid hardness of the center of brazing seam is about 307 HV10

which is more than twice that of the base metal. The fracture analysis results show that the crack propagates along the brazing seam

and the fracture morphology has the characteristics of intergranular dimple

elongated dimple and cleavage fracture. The fracture is ductile and brittle composite fracture mode.

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Keywords

references

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