Abnormal grain growth in in situ TiB2 particle-reinforced 7055 Al composites

2022 ◽  
Author(s):  
Y. D. Chen ◽  
Z. C. Li ◽  
C. Y. Dan ◽  
Y. C. Chen ◽  
H. W. Wang ◽  
...  
Keyword(s):  
Grain Growth ◽  
Tib2 Particle ◽  
Abnormal Grain Growth

In-situ observation of abnormal grain growth in a low-alloyed carbon steel using SEM-EBSD

Materialia ◽  
2021 ◽  
Vol 15 ◽  
pp. 100985
Author(s):  
Genki Saito ◽  
Tianglong Zhang ◽  
Norihito Sakaguchi ◽  
Munekazu Ohno ◽  
Kiyotaka Matsuura ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
In Situ Observation

scholarly journals An in situ transmission electron microscope investigation into grain growth and ordering of sputter-deposited nanocrystalline Ni3Al thin films

2002 ◽  
Vol 17 (8) ◽  
pp. 2085-2094 ◽  
Author(s):  
H. P. Ng ◽  
A. H. W. Ngan
Keyword(s):  
Electron Microscope ◽  
Grain Growth ◽  
Transmission Electron Microscope ◽  
Growth Kinetics ◽  
Abnormal Grain Growth ◽  
Face Centered Cubic ◽  
Transmission Electron ◽  
Sputter Deposited ◽  
Grain Growth Kinetics

The grain growth kinetics and ordering behavior of direct-current magnetron sputter-deposited Ni75at.%Al25at.% alloy films were investigated using in situ isothermal annealing in a transmission electron microscope. Both normal and abnormal grain growth modes were observed. The normal grain growth kinetics under isothermal heating from 300 to 700 °C were found to comply with the Burke law d = K/dn−1, where d is grain size and K and n are constants with respect to time. The grain boundary mobility parameter K was found to obey an Arrehnius rate law with an apparent activation energy of 1.6 eV, and n was found to increase gradually from 5.2 at 300 °C to 8.7 at 700 °C. Abnormal grain growth occurred at 500 °C or higher, and grain coalescence was identified as an important operative mechanism. It was also observed that the initially as-deposited state of the films was crystalline with a disordered face-centered-cubic structure, but ordering into the equilibrium L12 intermetallic structure followed from annealing at temperatures above approximately 500 °C.

In Situ TEM Investigation of Abnormal Grain Growth in Nanocrystalline Nickel

2005 ◽  
Vol 907 ◽  
Author(s):  
David M. Follstaedt ◽  
Khalid Hattar ◽  
James A. Knapp ◽  
Ian M. Robertson
Keyword(s):  
Grain Growth ◽  
Growth Direction ◽  
Stacking Fault ◽  
Abnormal Grain Growth ◽  
In Situ Tem ◽  
Nanocrystalline Nickel ◽  
Abnormal Growth ◽  
Transmission Electron ◽  
Stacking Fault Tetrahedra

AbstractIn situ transmission electron microscopy was used to show that nanocrystalline nickel produced by pulsed-laser deposition undergoes abnormal grain growth at moderate temperatures (225-400°C). The growth rate was found to increase with thickness for the three film thicknesses examined, 50, 80 and 150 nm. The abnormal growth proceeded in an irregular manner: initiation sites and growth direction were unpredictable, and the grains exhibited no preferred orientation. Some abnormal grains show internal boundaries such as twins, while others exhibited lattice misalignments across the grain body. The grains contain many defects, including dislocations, stacking faults and surprisingly, stacking fault tetrahedra. The stacking fault tetrahedra are not a result of quenching nor of electron irradiation-induced lattice displacements; they instead are thought to form from vacancies trapped in the growing grain as it incorporates lower-density material at the high-angle grain boundaries in the nanocrystalline matrix.

In-situ TEM observations of abnormal grain growth, coarsening, and substrate de-wetting in nanocrystalline Ag thin films

2000 ◽  
Vol 370 (1-2) ◽  
pp. 54-62 ◽  
Author(s):  
Rand Dannenberg ◽  
E.A. Stach ◽  
J.R. Groza ◽  
B.J. Dresser
Keyword(s):  
Thin Films ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
In Situ Tem

scholarly journals In situ Observation of Abnormal Grain Growth of Austenite in Case Hardening Steel

2020 ◽  
Vol 106 (12) ◽  
pp. 924-933
Author(s):  
Yuta Imanami ◽  
Takashi Iwamoto ◽  
Kimihiro Nishimura
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Case Hardening ◽  
Case Hardening Steel

scholarly journals In-situ Observation of Abnormal Grain Growth of Austenite in Case Hardening Steel

2021 ◽  
Vol 61 (11) ◽  
pp. 2813-2821
Author(s):  
Yuta Imanami ◽  
Takashi Iwamoto ◽  
Kimihiro Nishimura
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Case Hardening ◽  
Case Hardening Steel

Abnormal Grain Growth Mechanism in Alumina

2006 ◽  
Vol 510-511 ◽  
pp. 474-477 ◽  
Author(s):  
Hee Gon Bang ◽  
Jun Ho Song ◽  
Sang Yeup Park
Keyword(s):  
Grain Growth ◽  
Porous Alumina ◽  
Growth Behavior ◽  
Abnormal Grain Growth ◽  
Main Role ◽  
Sintering Process ◽  
Nucleation Stage ◽  
Small Grains ◽  
Grain Growth Behavior

During the sintering process, the onset of abnormal grain growth is depend on various factors. The abnormal grain growth behavior, however, was focused only the growth stage compared to nucleation stage. Because most of abnormal grain growth occurred to a rapid mode, the observation of abnormal grain growth was impossible. In this study, we intend to in-situ observe the nucleation stage of abnormal grain using porous alumina. As a result, the liquid phase due to unintended impurities plays a main role for the formation of abnormal nuclei by the rearrangement of small grains due to the capillary force.

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