1995 Volume 44 Issue 504Appendix Pages 193-197
The metallurgical properties of the interface regions of as-welded dissimilar friction joints between pure titanium (Ti) and aluminum-magnesium alloy (A5083) base materials were investigated. Hardness values in the region about Imm from the joint interface were higher than those in the bulk Ti and A5083 substrates. No transition layer was observed at the joint interface using optical microscopy, X-ray diffraction analysis and scanning electron microscope (SEM) including EDS-analysis. However, transmission electron microscope (TEM) observation of the joint interface region confirmed that intermetallic phases with thickness of 200nm or less were produced during joining. The intermetallic phases were estimated to be Mg2Al3, Al3Ti and τ-Al (Ti2Mg3Al18) by TEM-EDS analysis. It was concluded that the selection of joining parameters that promotes the formation of thin transition and intermetallic layers produces dissimilar joints with satisfactory mechanical properties.
