Measurement Uncertainty and Representation of Tensile Mechanical Properties in Metals

The International Organization for Standardization Technical Committee Metallic Materials—Tensile Testing stated in 2011 that temperature and strain rate variations would induce a change the results of tensile tests, termed as measurement uncertainty mechanical properties metals. means testing specimen at are not original possessed prior to testing. Hence, since time Galileo have been incorrectly interpreted specimens, thereby forming paradox. At turn 21st century, micro-theory metallic elastic deformation was proposed, identifying microstructure atomic level could occur during deformation, leading concentration solute (impurity) grain boundaries/around dislocations. has used explain mechanism uncertainty. Different temperatures rates correspond different durations testing, concentrations boundaries/dislocations, thus properties. On this basis, new technology system is suggested, i.e., “mechanical property–tensile rate” curve given test can be evaluate property. higher is, closer property on Therefore, determine tested metal, sufficiently high required. also characterize variation metal service with time. In addition, characterized by point represent when processing-deformed corresponding rate. As an example application system, high-entropy alloys represented curve. show conceptual framework mechanics.