Room temperature mechanical behaviour of a Ni-Fe multilayered material with modulated grain size distribution

Deformation behavior of multilayered NiFe with bimodal grain size distribution at room and elevated temperature

“…The tests were performed only at room temperature. In contrast to these results a rule of mixture was not observed by Kurmanaeva et al [27] for ML NiFe, also tested at room temperature. Instead the measured yield and ultimate tensile strengths were higher than expected on the basis of the rule of mixture.…”

“…Instead the measured yield and ultimate tensile strengths were higher than expected on the basis of the rule of mixture. Furthermore, the elongation to failure of the ML samples was less than that of the monolithic NC NiFe specimens [27]. Daly et al reported a slightly enhanced ductility of the ML NiCo specimens compared with the NC NiCo [61].…”

“…Instead of intermixing coarse and nanocrystalline grains the approach of the present study is to understand the mechanical behavior of a ML material consisting of NC and CG layers as it has been published by Kurmanaeva et al [27] for a NiFe alloy and Daly et al [61] for a ML NiCo alloy recently. Daly et al reported that the yield and ultimate tensile strengths for the ML NiCo follow a rule of mixture relationship with respect to the tested monolithic NC and CG NiCo specimens.…”

“…Inspection of the published literature shows that most studies report mechanical behavior from testing performed at room temperature [2,3,4,27]. There are, however, some limited reports on tests at elevated temperature, such as a study of ML Cu/Nb by Mara et al [23][24][25][26], for example.…”

“…There are, however, some limited reports on tests at elevated temperature, such as a study of ML Cu/Nb by Mara et al [23][24][25][26], for example. Our previous study on ML NiFe [27] compared the mechanical properties of ML NiFe alloy to those of monolithic CG and NC NiFe samples. The tests were only completed at room temperature and at one selected strain rate.…”