Phase field simulation for grains evolution of 17-4PH steel during cyclic heat treatment

Flory–Huggins theory combined with experimental tests and phase-field simulation proves that electrospinning improves the homogeneity and Eb in composite films, and MS can limit the ferroelectric relaxation of PVDF and significantly increase Ue and η.

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Phase-Field Simulation of Orowan Strengthening by Coherent Precipitate Plates in an Aluminum Alloy

Metallurgical and Materials Transactions A ◽

10.1007/s11661-015-2895-3 ◽

2015 ◽

Vol 46 (7) ◽

pp. 3287-3301 ◽

Cited By ~ 23

Author(s):

Hong Liu ◽

Yipeng Gao ◽

Liang Qi ◽

Yunzhi Wang ◽

Jian-Feng Nie

Keyword(s):

Aluminum Alloy ◽

Phase Field ◽

Phase Field Simulation ◽

Field Simulation ◽

Coherent Precipitate

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Creating polar antivortex in PbTiO3/SrTiO3 superlattice

Nature Communications ◽

10.1038/s41467-021-22356-0 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Adeel Y. Abid ◽

Yuanwei Sun ◽

Xu Hou ◽

Congbing Tan ◽

Xiangli Zhong ◽

...

Keyword(s):

Phase Transitions ◽

Phase Field ◽

Driving Force ◽

Topological Phase ◽

Phase Field Simulation ◽

Topological Structures ◽

Field Simulation ◽

Condensed Matters ◽

Topological Phase Transitions ◽

Insight Into

AbstractNontrivial topological structures offer a rich playground in condensed matters and promise alternative device configurations for post-Moore electronics. While recently a number of polar topologies have been discovered in confined ferroelectric PbTiO3 within artificially engineered PbTiO3/SrTiO3 superlattices, little attention was paid to possible topological polar structures in SrTiO3. Here we successfully create previously unrealized polar antivortices within the SrTiO3 of PbTiO3/SrTiO3 superlattices, accomplished by carefully engineering their thicknesses guided by phase-field simulation. Field- and thermal-induced Kosterlitz–Thouless-like topological phase transitions have also been demonstrated, and it was discovered that the driving force for antivortex formation is electrostatic instead of elastic. This work completes an important missing link in polar topologies, expands the reaches of topological structures, and offers insight into searching and manipulating polar textures.

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Laser Powder Bed Fusion Processing of Fe-Mn-Al-Ni Shape Memory Alloy—On the Effect of Elevated Platform Temperatures

Metals ◽

10.3390/met11020185 ◽

2021 ◽

Vol 11 (2) ◽

pp. 185

Author(s):

Felix Clemens Ewald ◽

Florian Brenne ◽

Tobias Gustmann ◽

Malte Vollmer ◽

Philipp Krooß ◽

...

Keyword(s):

Heat Treatment ◽

Crack Formation ◽

Microstructural Analysis ◽

Tensile Load ◽

Grain Structure ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Cyclic Heat Treatment ◽

Powder Bed ◽

Cyclic Heat

In order to overcome constraints related to crack formation during additive processing (laser powder bed fusion, L-BPF) of Fe-Mn-Al-Ni, the potential of high-temperature L-PBF processing was investigated in the present study. The effect of the process parameters on crack formation, grain structure, and phase distribution in the as-built condition, as well as in the course of cyclic heat treatment was examined by microstructural analysis. Optimized processing parameters were applied to fabricate cylindrical samples featuring a crack-free and columnar grained microstructure. In the course of cyclic heat treatment, abnormal grain growth (AGG) sets in, eventually promoting the evolution of a bamboo like microstructure. Testing under tensile load revealed a well-defined stress plateau and reversible strains of up to 4%.

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