Effect of stress-induced grain growth during room temperature tensile deformation on ductility in nanocrystalline metals

Abstract

Abstract. In the present study defect-free nanocrystalline (nc) Ni-Co alloys with the Co content ranging from 2⋅4-59⋅3% (wt.%) were prepared by pulse electrodeposition. X-ray diffraction analysis shows that only a single face-centred cubic solid solution is formed for each alloy and that the grain size reduces monotonically with increasing Co content, which is consistent with transmission electron microscopy (TEM) observations. In the nc Ni-Co alloys, both the ultimate tensile strength and the elongation to failure increase as the Co content increases. The TEM observations reveal that stress-induced grain growth during tensile deformation is significantly suppressed for the nc Ni-Co alloys rich in Co in sharp contrast to those poor in Co. We believe that sufficient solutes could effectively pin grain boundaries making grain boundary motions (e.g. grain boundary migration and/or grain rotation) during deformation more difficult. Thus, stress-induced grain growth is greatly suppressed. At the same time, shear banding plasticity instability is correspondingly delayed leading to the enhanced ductility.

Dynamic crystallization during non-isothermal laser treatment of Fe–Si–B metallic glass

“…It has been reported in the case of nanocrystalline alloys that the applied stress can cause a stress assisted grain growth [159][160][161][162]. Such observations have been made in the case of tensile loading [162,163], compressive loading [164,165], and indentation experiments [159,166]. Fig.…”

An Anomaly in Creep Property Dependence on Grain Size for Ultrafine Grain Nanocrystalline Nickel at Higher Creep Temperature

“…The deformation induced enlargement of grain growth (i.e. dynamic grain growth) becomes important topic of interest of several researchers [15][16][17][18][19][20] for at least last three decades. Grain growth phenomenon is known to be also influenced by deformation.…”