J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (3): 259-264.DOI: 10.1016/j.jmst.2015.12.002

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Detailed Evolution Mechanism of Interfacial Void Morphology in Diffusion Bonding

Chao Zhang, Hong Li, Miaoquan Li   

  1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2015-06-10 修回日期:2015-08-20 出版日期:2016-03-10

Detailed Evolution Mechanism of Interfacial Void Morphology in Diffusion Bonding

Chao Zhang, Hong Li, Miaoquan Li   

  1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2015-06-10 Revised:2015-08-20 Online:2016-03-10
  • Contact: Ph.D.; Tel.: +86 29 88460328; Fax: +86 29 88492642.E-mail address: zc9997242256@126.com (M. Li).
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 51505386 and No. 51275416), the China Postdoctoral Science Foundation (No. 2014M562447) and the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (16-BZ-2015).

摘要: Similar diffusion bonding of 1Cr11Ni2W2MoV stainless steel was conducted at different bonding temperatures. The interface characteristics and mechanical properties of joints were examined, and the evolution of interfacial void morphology was analyzed in detail. The results showed that there were four typical interfacial void shapes generating sequentially: the large scraggly voids, penny-shaped voids, ellipse voids and rounded voids. The variation of interfacial void shape was dominated by surface diffusion, while the reduction of void volume was ascribed to the combined effects of plastic flow of materials around voids, interface diffusion and volume diffusion. Owing to the elimination of void from the bonding interface, the sound joint obtained could exhibit nearly full interfacial contact, and present excellent mechanical properties, in which the microhardness and shear strength of joint matched those of base material.

关键词: Stainless steel, Diffusion bonding, Void morphology, Mechanical property

Abstract: Similar diffusion bonding of 1Cr11Ni2W2MoV stainless steel was conducted at different bonding temperatures. The interface characteristics and mechanical properties of joints were examined, and the evolution of interfacial void morphology was analyzed in detail. The results showed that there were four typical interfacial void shapes generating sequentially: the large scraggly voids, penny-shaped voids, ellipse voids and rounded voids. The variation of interfacial void shape was dominated by surface diffusion, while the reduction of void volume was ascribed to the combined effects of plastic flow of materials around voids, interface diffusion and volume diffusion. Owing to the elimination of void from the bonding interface, the sound joint obtained could exhibit nearly full interfacial contact, and present excellent mechanical properties, in which the microhardness and shear strength of joint matched those of base material.

Key words: Stainless steel, Diffusion bonding, Void morphology, Mechanical property