Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 23, Issue 3, Pages 599-604Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(13)62505-4
Keywords
magnesium alloy; stainless steel; diffusion bonding; brazing; microstructural characteristics; dissimilar metals welding
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Funding
- National Natural Science Foundation of China [51205428]
- Fundamental Research Funds for the Central Universities, China [CDJRC10130011]
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A novel joining method, double-stage diffusion-brazing of an AZ31 magnesium alloy and a 304L austenitic stainless steel, was carried out using a pure copper interlayer. The solid-state diffusion bonding of 304L to copper was conducted at 850 C for 20 min followed by brazing to AZ31 at 520 degrees C and 495 degrees C for various time. Microstructural characteristics of the diffusion-brazed joints were investigated in detail. A defect free interface of Fe-Cu diffusion area appeared between the Cu alloy and the 304L steel. Cu-Mg reaction products were formed between AZ31 and Cu alloys. A layered structure including AZ31/Cu-Mg compounds/Cu/Fe-Cu diffusion layer/304L was present in the joint. With time prolonging, the reduction in the width of Cu layer was balanced by the increase in the width of Cu-Mg compounds zone. Microhardness peaks in the zone between AZ31 and Cu layer were attributed to the formation of Mg-Cu compounds in this zone.
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