Acta Materialia

Journal: Acta Materialia

Abbreviation

Acta Mater

Publisher

Elsevier

ISSN

1359-6454

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Publications 1 - 10 of 160

Twinning induced spatial stress gradients: Local versus global stress states in hexagonal close-packed materials
Fidder, Herman; Basu, Indranil; De Hosson, Jeff Th.M. (2023)
Acta Materialia
Length scale dependent microstructural heterogeneities serve as effective pathways in engineering materials for providing simultaneous strength-ductility enhancement. In this regard, hexagonal close-packed (hcp) materials that exhibit a combination of slip and multiple twinning modes potentially act as ideal candidates that generate heterogeneous microstructures. However, such an inhomogeneous distribution of crystallographic defects also results in build-up of spatially heterogeneous local stress gradients that can be distinct from globally applied stress state. In particular, stress fields arising at the vicinity of deformation twins and due to their interaction with grain interfaces often act as precursors to damage nucleation in most hcp metals and alloys. Hence, assessment of such local stresses and their overall impact on plasticity becomes necessary in order to understand the relationship between twinning and fracture in hcp materials. The current work utilizes commercially pure titanium (cp-Ti) as a model material to investigate the impact of twinning induced stress gradients on the local mechanical response. By means of correlative multiscale structural characterization and local stress gradient measurements, we establish a definitive relationship between applied stress vis-à-vis local stress on the local plasticity behavior ahead of a {112¯2} compression twin-grain boundary intersection in cp-Ti. Additionally, the role of twin interfacial structure for tension and compression twinning modes are experimentally determined and their corresponding impact on the local stress fields and associated twin migration mechanisms is assessed.
Precipitation hardening of biodegradable Fe-Mn-Pd alloys
Moszner, Frank; Sologubenko, Alla; Schinhammer, Michael; et al. (2011)
Acta Materialia
In situ SANS study of pore microstructure in YSZ thermal barrier coatings
Strunz, Pavel; Schumacher, Gerhard; Vassen, Robert.; et al. (2004)
Acta Materialia
Quantitative phase field simulation of deep cells in directional solidification of an alloy
Lan, Chung-Wen; Shih, Chih-Jen; Lee, Min-Hung (2005)
Acta Materialia
Microstructural studies of crystallization of a Zr-based bulk metallic glass
Pekarskaya, E.; Löffler, Jörg F.; Johnson, W.L. (2003)
Acta Materialia
GrainPaint: A multi-scale diffusion-based generative model for microstructure reconstruction of large-scale objects
Hoffman, Nathan; Diniz, Cashen; Liu, Dehao; et al. (2025)
Acta Materialia
Simulation-based approaches to microstructure generation can suffer from a variety of limitations, such as high memory usage, long computational times, and difficulties in generating complex geometries. Generative machine learning models present a way around these issues, but they have previously been limited by the fixed size of their generation area. We present a new microstructure generation methodology leveraging advances in inpainting using denoising diffusion models to overcome this generation area limitation. We show that microstructures generated with the presented methodology are statistically similar to grain structures generated with a kinetic Monte Carlo simulator, SPPARKS.
Synchrotron X-ray microdiffraction reveals rotational plastic deformation mechanisms in polycrystalline thin films
Nyilas, Ralph D.; Kobas, Miroslav; Spolenak, Ralph (2009)
Acta Materialia
Deformation behavior of sintered nanocrystalline silver layers
Zabihzadeh, Seyed; Van Petegem, Steven; Duarte, Liliana I.; et al. (2015)
Acta Materialia
The as-deposited structure of co-sputtered Cu-Ta alloys, studied by X-ray diffraction and molecular dynamics simulations
Müller, Claudia Manuela; Parviainen, Stefan; Djurabekova, Flyura G.; et al. (2015)
Acta Materialia
Adaptive phase field simulation of non-isothermal free dendritic growth of a binary alloy
Lan, Chungwen; Chang, Yuchen; Shih, Chih-Jen (2003)
Acta Materialia

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