Nonlinear Acoustic Assessment of Precipitation-Induced Coherency Strains in Aluminum Alloy 2024
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
There currently exists no direct in situ method for nondestructively assessing the optimum heat treatment time for precipitation strengthening of bulk alloy material. We report here progress on our investigation of nonlinear acoustic methods as a nondestructive means of determining maximum material strengthening during the artificial aging of metallic alloys. We present the elements of an analytical model that predict the effects of precipitation-induced coherency strains generated during heat treatment on the magnitude of acoustic second harmonic signals. The predictions of the model are compared to experimental measurements of aluminum alloy 2024 artificially aged from T4 to T6 temper.