Microstructural development of diffusion-brazed austenitic stainless steel to magnesium alloy using a nickel interlayer

Journal Article · Thu Jul 15 04:00:00 EDT 2010 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2010.04.001· OSTI ID:22066259

Khan, Tahir I ^[1]

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1. Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N1N4 (Canada)

The differences in physical and metallurgical properties of stainless steels and magnesium alloys make them difficult to join using conventional fusion welding processes. Therefore, the diffusion brazing of 316L steel to magnesium alloy (AZ31) was performed using a double stage bonding process. To join these dissimilar alloys, the solid-state diffusion bonding of 316L steel to a Ni interlayer was carried out at 900 deg. C followed by diffusion brazing to AZ31 at 510 deg. C. Metallographic and compositional analyses show that a metallurgical bond was achieved with a shear strength of 54 MPa. However, during the diffusion brazing stage B{sub 2} intermetallic compounds form within the joint and these intermetallics are pushed ahead of the solid/liquid interface during isothermal solidification of the joint. These intermetallics had a detrimental effect on joint strengths when the joint was held at the diffusion brazing temperature for longer than 20 min.

• OSTI ID: 22066259
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 7 Vol. 61; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BONDING
BRAZED JOINTS
BRAZING
DIFFUSION
INTERFACES
INTERMETALLIC COMPOUNDS
MAGNESIUM ALLOY-AZ31B
METALLOGRAPHY
MICROSTRUCTURE
NICKEL
SHEAR PROPERTIES
SOLIDIFICATION
SOLIDS
STAINLESS STEEL-316L