Plane strain compression testing of aluminum alloy 6061 at elevated temperatures

Saul Martinez Rehlaender
The purpose of this work was to study the effect of different geometrical criteria for samples, in particular the effect of initial thickness on the measured stress - strain curves from hot plane strain compression tests. The recent use of computer models to simulate hot working processes requires experimental values for their appropriate implementation and verification. Therefore, there exists the need to have adequate testing methods to obtain stress - strain data at high temperatures. Plane
more » ... emperatures. Plane strain compression tests at elevated temperatures using aluminum alloy 6061 as a testing material were performed using the Gleeble 1500 Thermomechanical simulator. The temperature range of 400 - 500°C, strain rate; of 0.05 - 1 I sec. and true strain of 1 were used as testing conditions. In the present work, three plate shaped sample geometries with different thicknesses were used; a set of compressing platens was designed and fabricated in order to test these samples. The plate - shaped samples were made to test the recommendations given by the ASM [3 1 for obtaining plane strain. An additional cube - shaped sample geometry with its own set of compressing platens was also used; this tool and sample geometry was recommended by Duffers Scientific Inc. (now Dynamic Scientific Inc.), manufacturers of the Gleeble 1500. Stress - strain curves were obtained and it was observed that different stress - strain curves were produced, under the same testing conditions, for each of the tool I sample geometries used. Using optical metallography, the microstructure of the deformed samples from all the different sample geometries was observed. It was intended to observe the deformed grains and their localization in the deformation zone of the samples. It was found that, for a determined tool width, different initial tool width / sample thickness ratios (w / h) produce zones of deformed grains located in different regions of the deformation zone of the samples. Predictions of the strain distribution in the deformation z [...]
doi:10.14288/1.0078552 fatcat:mb3ztose2vdtndm77qdwcaqe24