Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy
- 1 June 2004
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 19 (6), 1623-1629
- https://doi.org/10.1557/jmr.2004.0227
Abstract
A nanostructured surface layer was formed on an Inconel 600 plate by subjecting it to surface mechanical attrition treatment at room temperature. Transmission electron microscopy and high-resolution transmission electron microscopy of the treated surface layer were carried out to reveal the underlying grain refinement mechanism. Experimental observations showed that the strain-induced nanocrystallization in the current sample occurred via formation of mechanical microtwins and subsequent interaction of the microtwins with dislocations in the surface layer. The development of high-density dislocation arrays inside the twin-matrix lamellae provides precursors for grain boundaries that subdivide the nanometer-thick lamellae into equiaxed, nanometer-sized grains with random orientations.Keywords
This publication has 19 references indexed in Scilit:
- Nanocrystalline grain structures developed in commercial purity Cu by low-temperature cold rollingJournal of Materials Research, 2002
- An investigation of surface nanocrystallization mechanism in Fe induced by surface mechanical attrition treatmentActa Materialia, 2002
- Microstructural evolution during grain boundary engineering of low to medium stacking fault energy fcc materialsActa Materialia, 2002
- Microstructure and evolution of mechanically-induced ultrafine grain in surface layer of AL-alloy subjected to USSPActa Materialia, 2002
- Microhardness and microstructural evolution in pure nickel during high-pressure torsionScripta Materialia, 2001
- Grain refinement mechanism during equal-channel angular pressing of a low-carbon steelActa Materialia, 2001
- Deformation mechanisms of Ti–6Al–4V alloy with a martensitic microstructure subjected to oligocyclic fatigueActa Materialia, 2000
- Surface nanocrystallization of iron induced by ultrasonic shot peeningNanostructured Materials, 1999
- The process of grain refinement in equal-channel angular pressingActa Materialia, 1998
- Mössbauer analysis of submicrometer grained ironScripta Metallurgica et Materialia, 1991