Location
Cherry Auditorium, Kirk Hall
Start Date
4-28-2022 12:45 PM
Description
A lighthearted review of a career in research examining some of the changes over time will be presented. Two projects, one early in a research career and a second towards the end, both involving titanium and different types of failure will be described.
In the first project, fatigue crack initiation in a titanium alloy was investigated. The alloy was heat treated to enable the effect of microstructure on fatigue crack initiation to be investigated. In all the microstructures, crack initiation was at very localized slip regions, usually involving a second phase. Evidence of involvement of these slip regions in the initiation process was removed by crack propagation. This process also affected the appearance of the fracture surface at the initiation site.
In the second project, a coating process involving titanium ions was developed as an alternative to chromate coating for adhesive bonding and corrosion resistance. The titanate coating process was designed to closely mimic the standard chromate coating process to minimize industrial process changes. For adhesive bonding of titanium to carbon fiber, the titanate coating successfully replaced the chromate coating improving bond durability while modifying the failure mechanism. The same type of titanium coating process was also applied to aluminum alloys as a replacement for chromates for corrosion protection. Electrochemical data indicated that the titanate process on a small scale was successful in corrosion protection, however, scale up proved to be difficult.
Speaker Bio
Richard Brown was awarded a B.Sc. degree in Metallurgy from Nottingham University and a Ph.D. from Cambridge University. After a postdoctoral position at the University of Delaware, he was appointed an Assistant Professor in the Chemical Engineering Department at the University of Rhode Island in 1981. During his time at the University, he has twice Chaired the Chemical Engineering Department. Research focus during his tenure was mainly involved with materials degradation by corrosion and methods to mitigate its effect.
The Last One! Titanium and Me; A Career in Failure
Cherry Auditorium, Kirk Hall
A lighthearted review of a career in research examining some of the changes over time will be presented. Two projects, one early in a research career and a second towards the end, both involving titanium and different types of failure will be described.
In the first project, fatigue crack initiation in a titanium alloy was investigated. The alloy was heat treated to enable the effect of microstructure on fatigue crack initiation to be investigated. In all the microstructures, crack initiation was at very localized slip regions, usually involving a second phase. Evidence of involvement of these slip regions in the initiation process was removed by crack propagation. This process also affected the appearance of the fracture surface at the initiation site.
In the second project, a coating process involving titanium ions was developed as an alternative to chromate coating for adhesive bonding and corrosion resistance. The titanate coating process was designed to closely mimic the standard chromate coating process to minimize industrial process changes. For adhesive bonding of titanium to carbon fiber, the titanate coating successfully replaced the chromate coating improving bond durability while modifying the failure mechanism. The same type of titanium coating process was also applied to aluminum alloys as a replacement for chromates for corrosion protection. Electrochemical data indicated that the titanate process on a small scale was successful in corrosion protection, however, scale up proved to be difficult.
Comments
Downloadable file is a PDF of the original event flier.