scholarly journals Texture dependent surface energy measurements on magnetostrictive alloys for abnormal grain growth modeling

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035253
Author(s):  
Michael Van Order ◽  
Suok-Min Na ◽  
Alison Flatau
Keyword(s):  
Surface Energy ◽  
Grain Growth ◽  
Growth Modeling ◽  
Abnormal Grain Growth

The Effects of Dopants on Surface-Energy-Driven Secondary Grain Growth in Ultrathin Si Films

1985 ◽  
Vol 54 ◽  
Author(s):  
H.-J. Kim ◽  
C. V. Thompson
Keyword(s):  
Surface Energy ◽  
Grain Growth ◽  
Ultrathin Films ◽  
Abnormal Grain Growth ◽  
Growth Enhancement ◽  
Grain Boundary Mobility ◽  
Additional Doping ◽  
Heavily Doped ◽  
Si Films ◽  
P Type

ABSTRACTSecondary or abnormal grain growth has been observed in ultrathin films of silicon (<120nm) that were heavily doped with phosphorous or arsenic. This grain growth leads to grains which are much larger than the film thickness (>50x) and which have uniform (111) texture. This abnormal grain growth is believed to be driven, in part, by surface energy minimization and hence is termed surface-energy-driven secondary grain growth.It was found that n-type dopants, phosphorous and arsenic, markedly enhance the rate of secondary grain growth as seen through a lowering of the temperature required for significant growth. On the other hand, boron (a p-type dopant) appears to neither markedly increase nor decrease the rate of grain growth. Enhancement caused by phosphorous or arsenic is thought to stem from increases in the mobility of the grain boundaries. Enhancement of grain boundary mobility was found to be compensated (reduced or eliminated) by additional doping with boron.

scholarly journals Surface Energy Controlled Abnormal Grain Growth in Melt-quenched 6.6% Silicon Iron Ribbons

1988 ◽  
Vol 74 (6) ◽  
pp. 1044-1051
Author(s):  
Toshiro TOMIDA ◽  
Atsuki OKAMOTO ◽  
Masashi TAKAHASHI
Keyword(s):  
Surface Energy ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Silicon Iron

Surface-energy-driven abnormal grain growth in Cu and Ag films

2005 ◽  
Vol 242 (1-2) ◽  
pp. 55-61 ◽  
Author(s):  
Fei Ma ◽  
Jian-Min Zhang ◽  
Ke-Wei Xu
Keyword(s):  
Surface Energy ◽  
Grain Growth ◽  
Abnormal Grain Growth

On the Abnormal Grain Growth in Pure Magnesium

2018 ◽  
Author(s):  
Risheng Pei ◽  
Sandra Korte-Kerzel ◽  
Talal Al-Samman
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Pure Magnesium

scholarly journals Precipitation Criterion for Inhibiting Austenite Grain Coarsening during Carburization of Al-Containing 20Cr Gear Steels

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 504
Author(s):  
Huasong Liu ◽  
Yannan Dong ◽  
Hongguang Zheng ◽  
Xiangchun Liu ◽  
Peng Lan ◽  
...  
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Grain Structure ◽  
Pinning Force ◽  
Grain Coarsening ◽  
Zener Pinning ◽  
Austenite Grain ◽  
Composition Optimization ◽  
Gear Steels ◽  
Grain Growth Behavior

AlN precipitates are frequently adopted to pin the austenite grain boundaries for the high-temperature carburization of special gear steels. For these steels, the grain coarsening criterion in the carburizing process is required when encountering the composition optimization for the crack-sensitive steels. In this work, the quantitative influence of the Al and N content on the grain size after carburization is studied through pseudocarburizing experiments based on 20Cr steel. According to the grain structure feature and the kinetic theory, the abnormal grain growth is demonstrated as the mode of austenite grain coarsening in carburization. The AlN precipitate, which provides the dominant pinning force, is ripened in this process and the particle size can be estimated by the Lifshitz−Slyosov−Wagner theory. Both the mass fraction and the pinning strength of AlN precipitate show significant influence on the grain growth behavior with the critical values indicating the grain coarsening. These criteria correspond to the conditions of abnormal grain growth when bearing the Zener pinning, which has been analyzed by the multiple phase-field simulation. Accordingly, the models to predict the austenite grain coarsening in carburization were constructed. The prediction is validated by the additional experiments, resulting in accuracies of 92% and 75% for the two models, respectively. Finally, one of the models is applied to optimize the Al and N contents of commercial steel.

Orientation mapping linked to fractal analysis: A method for studying abnormal grain growth in nanocrystalline PdAu

2020 ◽  
Vol 128 (18) ◽  
pp. 185109
Author(s):  
Christian Braun ◽  
Raphael A. Zeller ◽  
Hanadi Menzel ◽  
Jörg Schmauch ◽  
Carl E. Krill ◽  
...  
Keyword(s):  
Grain Growth ◽  
Fractal Analysis ◽  
Abnormal Grain Growth ◽  
Orientation Mapping

scholarly journals Mean Field Analysis of Orientation Selective Grain Growth Driven By Interface-Energy Anisotropy

1994 ◽  
Vol 343 ◽  
Author(s):  
J. A. Floro ◽  
C. V. Thompson
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Growth ◽  
Texture Evolution ◽  
Mean Field ◽  
Orientation Distribution ◽  
Interface Energy ◽  
Abnormal Grain Growth ◽  
Field Analysis ◽  
Energy Anisotropy

ABSTRACTAbnormal grain growth is characterized by the lack of a steady state grain size distribution. In extreme cases the size distribution becomes transiently bimodal, with a few grains growing much larger than the average size. This is known as secondary grain growth. In polycrystalline thin films, the surface energy γs and film/substrate interfacial energy γi vary with grain orientation, providing an orientation-selective driving force that can lead to abnormal grain growth. We employ a mean field analysis that incorporates the effect of interface energy anisotropy to predict the evolution of the grain size/orientation distribution. While abnormal grain growth and texture evolution always result when interface energy anisotropy is present, whether secondary grain growth occurs will depend sensitively on the details of the orientation dependence of γi.

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