Microstructure–mechanical property relationships in ultrafine-grained NbZr

The digital image correlation (DIC) technique was successfully utilized to detect fatigue-induced damage and monitor its evolution in ultrafine-grained interstitial-free steels of three different microstructures in the low-cycle fatigue regime Specifically, visualization of strain localization with DIC allows for detecting the crack initiation sites after only a few cycles into the deformation Furthermore, optical microscopy, atomic force microscopy and electron backscatter diffraction analyses revealed a direct correlation between elongated grains and the crack initiation sites The results of a crystal plasticity model demonstrated that higher overall stresses are prevalent in the microstructures with elongated grains, which is attributed to strain localizations, and corresponding stress concentrations responsible for crack initiation Overall, the current findings show that DIC is a novel and promising non-destructive technique for determining the crack initiation sites at the very early stages of cyclic deformation

Monitoring the fatigue-induced damage evolution in ultrafine-grained interstitial-free steel utilizing digital image correlation

The role of heat treatment on the cyclic stress–strain response of ultrafine-grained interstitial-free steel

Cyclic deformation response of UFG 2024 Al alloy

The role of grain boundary misorientation angles on the dislocation – grain boundary interactions was incorporated into a micro hardening scheme. The current formulation is applicable to both coarse- and ultrafine-grained alloys, and evidences the experimentally observed dominant role of the misorientation angles on the deformation response of the latter.

Experimental and Numerical Investigation of the Role of Grain Boundary Misorientation Angle on the Dislocation–Grain Boundary Interactions

This article reports on the influence of zirconium (Zr) addition (0.17 wt pct) on the cyclic stability of ultrafine-grained (UFG) oxygen-free high-conductivity (OFHC) copper (Cu) of originally high (99.995 wt pct) purity processed via equal-channel angular extrusion (ECAE). Systematic low-cycle fatigue (LCF) tests accompanied by microstructural investigation revealed that a Zr addition substantially affects the cyclic stability of UFG Cu, such that longer fatigue lives, notable cyclic hardening, and higher stress ranges were attained in the LCF regime. This significant improvement of the fatigue properties of OFHC Cu by the addition of Zr is attributed to the Cu-Zr precipitates and impurities, effectively limiting the mobility of the grain boundaries and additional work hardening imposed by the precipitates. In addition, the strain-amplitude and strain-rate dependencies of the cyclic stability of Zr-added UFG Cu were investigated in detail, where the UFG Cu-Zr alloy exhibits an expressively lesser dependency as compared with the pure UFG Cu. The current results offer new insight into the improvement of the cyclic stability of UFG Cu and other UFG materials, and provides a venue for their utility in a broader range of applications demanding enhanced cyclic deformation response and stability.

The Influence of Zirconium on the Low-Cycle Fatigue Response of Ultrafine-Grained Copper

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The Influence of Zirconium on the Low-Cycle Fatigue Response of Ultrafine-Grained Copper