Interfacial microstructure and shear strength of TC4 alloy joints vacuum brazed with Ti-Zr-Ni-Cu filler metal

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:775

Article

Liu, Shilei¹  Miao, Jiakai¹  Zhang, Weiwei¹  Wei, Ran¹  Chen, Chen¹  Wang, Tan¹  Zhao, Wuduo²  Jiang, Zhengyi³  Li, Fushan¹ 

[1] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China

[2] Zhengzhou Univ, Ctr Adv Anal & Computat Sci, Zhengzhou 450001, Peoples R China

[3] Univ Wollongong, Sch Mech Mat Mechatron & Biomed Engn, Wollongong, NSW 2522, Australia

关键词: Titanium alloy;    Vacuum brazing;    Microstructure;    Shear strength;   

DOI  :  10.1016/j.msea.2020.138990

来源: Elsevier

【 摘 要 】

Ti-6Al-4V alloy was successfully vacuum brazed with a commercial Ti-37.5Zr-10Ni-15Cu (wt.%) filler metal. The effect of brazing temperature and time on the microstructure and shear strength of the brazed joints were investigated. When the brazing temperature was 905 degrees C for 10 min, the typical interfacial microstructure of the brazed joint were a single layer of alpha-Ti with a high concentration of Ti, alpha-Ti, (Ti, Zr)(2)(Cu, Ni) intermetallic compound and eutectoid microstructure. Increasing the brazing temperature and time are beneficial to eliminate the (Ti, Zr)(2)(Cu, Ni) intermetallic compound that degrades the properties in the brazed joint. The shear strength of the brazed joint increases first and then decreases with brazing temperature, and increases with the extended holding time. The maximum shear strength of the brazed joint is 635.77 MPa at a brazing temperature of 920 degrees C for 30 min due to the high content of columnar alpha-Ti. Extending the brazing time is obviously beneficial to increasing the strength. The microstructure and shear strength of the brazed joint are highly dependent on brazing temperature and time.

【 授权许可】

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