In most cases, scientists design a low yield deformable matrix which strengthens via phase transformations, twinning etc. However in many engineering applications a low yield point is not desirable.
Hello,
such behavior is, in some cases, observed in ultrafine-grained materials, see e.g. here:
https://www.mse.ncsu.edu/research/zhu/papers/Metal/MRL-ideal%20UFG.pdf
Regards,
Robert
Hello,
Usually, in ultrafine-grained materials, the increase in tensile strength is also inversely related to ductility (elongation), i.e. the increase in strength reduces ductility. Ductility and deformation are strongly dependent on the mobility of dislocations within the sample.
Regards,
Hi,
thank you all for your answers. I am mostly interested in increasing the yield strength than the UTS point. In many cases by increasing the UTS, does not lead to an increase in yield strength. For example, TRIP or TWIP steels, have in general relatively low yield point, very high UTS and total elongation. However Boron steels even though have low deformability, it is attractive to manufacturers because it has very high yield strength ~1200-1400MPa or even higher.
Cheers,
Panos
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