Our understanding of grain-level bursts of plasticity in polycrystals remains limited by current techniques.By employing a modified Synchrotron transmission X-ray Laue diffraction method(beam size larger than the grai...Our understanding of grain-level bursts of plasticity in polycrystals remains limited by current techniques.By employing a modified Synchrotron transmission X-ray Laue diffraction method(beam size larger than the grain size),we tracked grain rotations for the first 1%of tensile strain,in 4400 time steps.We indexed 33 grains and quantified the magnitude and frequency of intermittent bursts of grain rotation.We interpret these events in terms of bursts of plastic deformation.The events are highly coordinated amongst nearby grains,and their frequency and magnitude,as well as the number of grains participating,peaked at around the onset of full plasticity.At this point,7 out of the 10 indexed grains with orientations favorable for twinning showed significant drops in diffracted intensity(a mean value of 8%),due to twin induced re-orientation.For other orientations,20 out of 23 grains displayed bursts attributable to lattice dislocation glide(interpreted in terms of basal and prismatic <α> slip).The mean value of the magnitude of these bursts is∼0.08°,implying accumulated shear strains of the order of 3×10^(-3).These bursts,in many cases,were due to the activation of more than a single slip/twin system within the grain,and co-ordination amongst neighboring grains also involved collaboration between slip and twinning events.展开更多
The recent progress on the liquid crystalline(LC)dispersion of two-dimensional(2D)transition metal carbides(MXenes)has propelled this unique nanomaterial into a realm of high-performance architectures,such as films an...The recent progress on the liquid crystalline(LC)dispersion of two-dimensional(2D)transition metal carbides(MXenes)has propelled this unique nanomaterial into a realm of high-performance architectures,such as films and fibers.Additionally,compared to architectures made from typical non-LC dispersions,those derived from LC MXene possess tunable ion transport routes and enhanced conductivity and physical properties,demonstrating great potential for a wide range of applications,such as electronic displays,smart glasses,and thermal camouflage devices.This review provides an overview of the progress achieved in the production and processing of LC MXenes,including critical discussions on satisfying the required conditions for LC formation.It also highlights how acquiring LC MXenes has broadened the current solution-based manufacturing paradigm of MXene-based architectures,resulting in unprecedented performances in their conventional applications(e.g.,energy storage and strain sensing)and in their emerging uses(e.g.,tribology).Opportunities for innovation and foreseen challenges are also discussed,offering future research directions on how to further benefit from the exciting potential of LC MXenes with the aim of promoting their widespread use in designing and manufacturing advanced materials and applications.展开更多
基金the Australian Research Council through the Discovery Grant DP200100727 and Laureate Fellowship FL210100147。
文摘Our understanding of grain-level bursts of plasticity in polycrystals remains limited by current techniques.By employing a modified Synchrotron transmission X-ray Laue diffraction method(beam size larger than the grain size),we tracked grain rotations for the first 1%of tensile strain,in 4400 time steps.We indexed 33 grains and quantified the magnitude and frequency of intermittent bursts of grain rotation.We interpret these events in terms of bursts of plastic deformation.The events are highly coordinated amongst nearby grains,and their frequency and magnitude,as well as the number of grains participating,peaked at around the onset of full plasticity.At this point,7 out of the 10 indexed grains with orientations favorable for twinning showed significant drops in diffracted intensity(a mean value of 8%),due to twin induced re-orientation.For other orientations,20 out of 23 grains displayed bursts attributable to lattice dislocation glide(interpreted in terms of basal and prismatic <α> slip).The mean value of the magnitude of these bursts is∼0.08°,implying accumulated shear strains of the order of 3×10^(-3).These bursts,in many cases,were due to the activation of more than a single slip/twin system within the grain,and co-ordination amongst neighboring grains also involved collaboration between slip and twinning events.
基金Australian Research Council,Grant/Award Number:IH210100023Australian National Fabrication Facility(ANFF)Victorian node at Deakin University+1 种基金Deakin-CSIRO InSitX X-ray facilityAlfred Deakin Post-doctoral Research Fellowships。
文摘The recent progress on the liquid crystalline(LC)dispersion of two-dimensional(2D)transition metal carbides(MXenes)has propelled this unique nanomaterial into a realm of high-performance architectures,such as films and fibers.Additionally,compared to architectures made from typical non-LC dispersions,those derived from LC MXene possess tunable ion transport routes and enhanced conductivity and physical properties,demonstrating great potential for a wide range of applications,such as electronic displays,smart glasses,and thermal camouflage devices.This review provides an overview of the progress achieved in the production and processing of LC MXenes,including critical discussions on satisfying the required conditions for LC formation.It also highlights how acquiring LC MXenes has broadened the current solution-based manufacturing paradigm of MXene-based architectures,resulting in unprecedented performances in their conventional applications(e.g.,energy storage and strain sensing)and in their emerging uses(e.g.,tribology).Opportunities for innovation and foreseen challenges are also discussed,offering future research directions on how to further benefit from the exciting potential of LC MXenes with the aim of promoting their widespread use in designing and manufacturing advanced materials and applications.
