solute segregation
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2022 ◽  
Vol 209 ◽  
pp. 114375
Author(s):  
Xin Wang ◽  
Yang Hu ◽  
Kehang Yu ◽  
Subhash Mahajan ◽  
Irene J. Beyerlein ◽  
...  

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7257
Author(s):  
Yongmei Zhang ◽  
Xiaona Wang ◽  
Shuai Yang ◽  
Weipeng Chen ◽  
Hua Hou

Ti-Al alloys have excellent high-temperature performance and are often used in the manufacture of high-pressure compressors and low-pressure turbine blades for military aircraft engines. However, solute segregation is easy to occur in the solidification process of Ti-Al alloys, which will affect their properties. In this study, we used the quantitative phase-field model developed by Karma to study the equiaxed dendrite growth of Ti-4.5% Al alloy. The effects of supersaturation, undercooling and thermal disturbance on the dendrite morphology and solute segregation were studied. The results showed that the increase of supersaturation and undercooling will promote the growth of secondary dendrite arms and aggravate the solute segregation. When the undercooling is large, the solute in the root of the primary dendrite arms is seriously enriched, and when the supersaturation is large, the time for the dendrite tips to reach a steady-state will be shortened. The thermal disturbance mainly affects the morphology and distribution of the secondary dendrite arms but has almost no effect on the steady-state of the primary dendrite tips. This is helpful to understand the cause of solute segregation in Ti-Al alloy theoretically.


Nano Letters ◽  
2021 ◽  
Author(s):  
Samik Mukherjee ◽  
Simone Assali ◽  
Oussama Moutanabbir
Keyword(s):  

Physchem ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 225-231
Author(s):  
Vladyslav Turlo

Dislocations present unique opportunities for nanostructuring advanced structural and functional materials due to the recent discoveries of linear complexions thermodynamically stable nanoscale features with unique chemistry and structure confined at dislocations. The formation of such features is driven by solute segregation near the dislocation core and results in the stabilization of dislocations, altering mechanical, thermodynamic, and transport properties of the final material. This perspective article gives an overview of the recent discoveries and predictions made by high-resolution experimental characterization techniques, as well as large-scale atomistic simulations in the newly emerging field of linear complexions.


Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1331
Author(s):  
Pavel Lejček ◽  
Siegfried Hofmann

The question is formulated as to whether entropy-driven grain boundary segregation can exist. Such a phenomenon would be based on the assumption that a solute can segregate at the grain boundary sites that exhibit positive segregation energy (enthalpy) if the product of segregation entropy and temperature is larger than this energy (enthalpy). The possibility of entropy-driven grain boundary segregation is discussed for several model examples in iron-based systems, which can serve as indirect evidence of the phenomenon. It is shown that entropy-driven grain boundary segregation would be a further step beyond the recently proposed entropy-dominated grain boundary segregation as it represents solute segregation at “anti-segregation” sites.


2021 ◽  
Vol 201 ◽  
pp. 113982
Author(s):  
Huan Zhang ◽  
Yangxin Li ◽  
Zhigang Ding ◽  
Tian Xie ◽  
Ruixue Liu ◽  
...  

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