Aluminum-lithium alloys have attracted the interest of the aerospace industry for some time now since the use of such alloys would reduce the weight of an airframe by roughly ten percent. The production of these alloys, however, requires precise thermal and/or thermomechanical treatments to insure required material properties, such as the yield strength and ductility. On-line monitoring of the state of the material thus seems to be desirable for quality control of these materials. This paper presents results of an investigation of fieldable NDE methods capable of providing information on the state of the material. Eddy current measurements were found to be particularly sensitive to Li in solid solution. Furthermore, it appears that hardness measurements are sensitive to the volume fractions, and probably the morphology, of the various precipitates formed. The results obtained so far (see also ) as well as by other authors on different aluminum alloys [2–4], this work will continue with additional results to be reported in future publications.
Available at: http://works.bepress.com/david_jiles/44/