Plastic deformation in diffusion bonding dissimilar materials

• Published in: Welding international Vol. 16; no. 10; pp. 811 - 816
• Main Authors: Lyamin, Ya V, Musin, Ra
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01-01-2002
• ISSN: 0950-7116; 1754-2138
• DOI: 10.1080/09507110209549620

In diffusion bonding of high-strength, low-deformability metallic and ceramic materials, both identical and dissimilar, the formation of welded joints with high strength and cracking resistance is a difficult task. In particular, this relates to cermet welded joints. When welding these materials, the development of the combined (or at least in one of the materials) plastic deformation of the entire contact area is very difficult. The height and uniformity of the activation process and physical-chemical interaction of the welding materials in the contact area result in a low strength of welded joints. In this work, experiments were carried out to examine the deformation of continuous and non-continuous (perforated) interlayers in vacuum diffusion bonding (the residual pressure of the gases in the working chamber was not higher than 6.6 x 1O exp -3 Pa) and the dependence of the strength characteristics of the cermet joints on different parameters sigma =f(T, p, t, K sub p , epsilon , epsilon ) where K sub p , is the coefficient of perforation determined as the ratio of the area of the perforated holes to the normal welding area. [Materials: MOb copper, AD1 aluminum, and UF-46 ceramics.]