Lattice rotations of individual bulk grains

Poulsen, Henning Friis; Margulies, L.; Schmidt, Søren; Winther, Grethe

doi:10.1016/s1359-6454(03)00206-4

Cited by 139 publications

(79 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 3a shows the lattice rotations of the 107 grains, where the filled symbols mark the final orientation after 9% elongation. The lattice rotations in Figure 3a resemble corresponding data previously published for 6% tensile elongated aluminium [9,10], except that the rotation directions are opposite -as expected when going from face-centred to body-centred cubic metals. The grains near the [001] − [1 ̅ 11] line rotate towards [001], but with significant scatter.…”

Section: Reconstruction Of Grainssupporting

confidence: 85%

See 1 more Smart Citation

Deformation-induced orientation spread in individual bulk grains of an interstitial-free steel

et al. 2015

View full text Add to dashboard Cite

Section: Reconstruction Of Grainssupporting

confidence: 85%

“…As the technique is nondestructive it enables studies of the same set of bulk grains before and after some external stimuli, e.g. elastic [5][6][7] and plastic deformation [8][9][10][11] or thermal annealing [12][13][14]. Several experimental set-ups are possible, each with specific advantages, e.g.…”

Section: Introductionmentioning

confidence: 99%

Deformation-induced orientation spread in individual bulk grains of an interstitial-free steel

et al. 2015

View full text Add to dashboard Cite

“…From a sequence of such measurements applied to the same sample, we can track its microstructural evolution and determine whether a particular processing protocol [such as a heat treatment (22)(23)(24) or a mechanical deformation (25)(26)(27)] induced grain rotation. Furthermore, we can correlate changes in grain orientation to the morphologies and misorientations of a rotating grain's immediate neighbors.…”

Section: Significancementioning

confidence: 99%

Direct observation of grain rotations during coarsening of a semisolid Al–Cu alloy

Dake

Oddershede

Sørensen

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Sintering is a key technology for processing ceramic and metallic powders into solid objects of complex geometry, particularly in the burgeoning field of energy storage materials. The modeling of sintering processes, however, has not kept pace with applications. Conventional models, which assume ideal arrangements of constituent powders while ignoring their underlying crystallinity, achieve at best a qualitative description of the rearrangement, densification, and coarsening of powder compacts during thermal processing. Treating a semisolid Al-Cu alloy as a model system for late-stage sintering-during which densification plays a subordinate role to coarsening-we have used 3D X-ray diffraction microscopy to track the changes in sample microstructure induced by annealing. The results establish the occurrence of significant particle rotations, driven in part by the dependence of boundary energy on crystallographic misorientation. Evidently, a comprehensive model for sintering must incorporate crystallographic parameters into the thermodynamic driving forces governing microstructural evolution.3D microstructural evolution | sintering | Ostwald ripening | grain rotation | x-ray imaging W hether we realize it or not, our daily lives are marked by encounters with sintering, ranging from natural rock formations and glaciers to artificial products like the porcelain from which we eat or the amalgam fillings in many teeth. Sintering is an efficient method for combining loose granular precursors into solid objects of predetermined shape at relatively low temperature, circumventing the processing route of melting, casting, and machining. The applications of sintering are widespread. For example, it is the predominant method for producing bulk technical ceramics (1), and, thanks to advances in powder metallurgy, sintering is of growing importance in the fabrication of metals, as well (2). The focus in recent years on nanostructured materials-specifically, on materials for energy storage and conversion-has intensified the scientific investigation and modeling of sintering processes. The latter find application in the production of fuel cells (3) and battery electrodes (4). In other applications, such as catalysis (5), sintering can be highly undesirable, as it reduces the connectivity of pores and the free surface of nanoparticles. In all of these cases, we need a firm understanding of sintering fundamentals to achieve and retain desired materials properties during thermal processing.The reduction in free energy that accompanies the removal of a powder compact's surface area is the driving force behind sintering (2, 6). When two particles come into contact, two free surfaces are replaced by a single solid/solid boundary. If the particles are crystalline, the new interface is a grain boundary, the (excess) energy of which is generally on the order of one-third of that of a (single) free surface of equal area (6); consequently, the sintering process results in a net release of energy. As free surface area decreases, the powder ...

show abstract

“…The 3DXRD technique [4][5] can measure such volumetric data during in-situ tests. It has been used to study lattice rotations of individual grains in aluminium alloys [6] and in Cu-AlBe SMA [7], phase transformation kinetics in steels [8][9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of lattice rotations and internal stresses in over one hundred individual grains during a stress-induced martensitic transformation

Hachi

Malard

Berveiller

et al. 2015

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. To better understand the properties of polycrystals at a microscopic scale during cyclic mechanical loading we have measured the relationship between grain orientations, their positions inside the sample and their internal stresses. In this work, in-situ 3DXRD technique was performed on over hundred grains during the stress-induced martensitic transformation in a Cu-Al-Be shape memory alloy. Information about the position, orientation, and stress field was obtained for each austenitic grain. These results have been used to develop a procedure that allows automatic processing for a large number of grains, matching them during loading and leads to a quantitative stress field. A strong heterogeneity of stress state between the grains at the surface and in the volume is evident.

show abstract

Lattice rotations of individual bulk grains

Cited by 139 publications

References 19 publications

Deformation-induced orientation spread in individual bulk grains of an interstitial-free steel

Deformation-induced orientation spread in individual bulk grains of an interstitial-free steel

Direct observation of grain rotations during coarsening of a semisolid Al–Cu alloy

Measurement of lattice rotations and internal stresses in over one hundred individual grains during a stress-induced martensitic transformation

Contact Info

Product

Resources

About