Grain Growth and Texture Development in Nanostructured Invar Alloy

2004 ◽  
Vol 467-470 ◽  
pp. 1313-1318 ◽  
Author(s):  
Jong Kweon Kim ◽  
Jun Hyuk Seo ◽  
Yong Bum Park
Keyword(s):  
Grain Growth ◽  
Texture Evolution ◽  
Orientation Imaging Microscopy ◽  
Orientation Dependence ◽  
Invar Alloy ◽  
Abnormal Growth ◽  
Orientation Imaging ◽  
Invar Alloys ◽  
Low Thermal Expansion ◽  
Texture Change

In the present work, a nanocrystalline Invar alloy (Fe-36wt%Ni) foil was fabricated by using a continuous electroforming method. This material exhibited outstanding mechanical properties and a relatively low thermal expansion coefficient as compared to conventional Invar alloys. The as-deposited texture was of fibre-type characterized by strong <100>//ND and weak <111>//ND components. Grain growth occurred during annealing beyond 350°C and resulted in such texture change that the <111>//ND fibre texture strongly developed with the minor <100>//ND components. It was clarified using orientation imaging microscopy that abnormal growth of the <111>//ND grains in the early stages of grain growth plays an important role on the texture evolution. The mechanism of the abnormal grain growth has been discussed in terms of the orientation dependence of energy density.

Textures and Grain Growth in Nanocrystalline Fe-Ni Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 3483-3488 ◽  
Author(s):  
J.H. Seo ◽  
Jong Kweon Kim ◽  
T.H. Yim ◽  
Yong Bum Park
Keyword(s):  
Energy Density ◽  
Grain Growth ◽  
Fibre Type ◽  
Texture Evolution ◽  
Orientation Imaging Microscopy ◽  
Orientation Dependence ◽  
Coarse Grained ◽  
Abnormal Growth ◽  
Ni Alloys ◽  
Orientation Imaging

The texture evolution due to grain growth that takes place during annealing was investigated in nanocrystalline Fe-Ni alloys fabricated by using a continuous electroforming method. In the current materials, grain growth occurred during annealing at much lower temperatures than in conventional coarse-grained counterparts. With regard to the macrotextures, the as-deposited textures were of fibre-type characterized by strong <100>//ND and weak <111>//ND components, and the occurrence of grain growth resulted in the strong development of the <111>//ND fibre texture with the minor <100>//ND components. It was clarified using orientation imaging microscopy that abnormal growth of the <111>//ND grains in the early stages of grain growth plays an important role on the texture evolution. The origin of the abnormal grain growth has been discussed in terms of the orientation dependence of energy density.

Development of Growth Texture in Nanocrystalline Fe-Ni Alloys

2005 ◽  
Vol 495-497 ◽  
pp. 749-754 ◽  
Author(s):  
Chang Sik Ha ◽  
Yong Bum Park
Keyword(s):  
Energy Density ◽  
Grain Growth ◽  
Fibre Type ◽  
Texture Evolution ◽  
Orientation Dependence ◽  
Texture Development ◽  
Fibre Texture ◽  
Abnormal Growth ◽  
Ni Alloys ◽  
Texture Change

In electroformed pure Ni and Fe-Ni alloys with nanometer-sized crystallites, grain growth that takes place during annealing results in a common texture change. With regard to the macrotextures, the as-deposited textures were of fibre-type characterized by strong <100>//ND and weak <111>//ND components, and the texture development due to grain growth was defined by strong <111>//ND fibre texture with the minor <100>//ND components. It was clarified by means of the microtexture analysis that abnormal growth of the <111>//ND grains occurs in the early stages of grain growth. The possible effects of the abnormal grain growth on the texture evolution have been discussed in terms of the orientation dependence of energy density.

Abnormal Grain Growth during Annealing in Nanocrystalline Fe-Ni Alloys

2007 ◽  
Vol 558-559 ◽  
pp. 1279-1282 ◽  
Author(s):  
J.H. Seo ◽  
Jong Kweon Kim ◽  
Yong Bum Park
Keyword(s):  
Grain Growth ◽  
Fibre Type ◽  
Texture Evolution ◽  
Orientation Imaging Microscopy ◽  
Abnormal Grain Growth ◽  
Morphological Features ◽  
Ni Alloys ◽  
Early Stages ◽  
Orientation Imaging

The texture evolution due to grain growth that takes place during annealing was investigated in nanocrystalline Fe-Ni alloys fabricated by using an electroforming method. In the current materials, the as-deposited textures were of fibre-type characterized by strong <100>//ND and weak <111>//ND components, and the occurrence of grain growth during annealing resulted in the strong development of the <111>//ND components with a significant decrease of the <100>//ND components. It was clarified that abnormal grain growth plays an important role on the evolution of the microstructures and textures. The abnormally grown grains were observed using orientation imaging microscopy in the early stages of grain growth, and their morphological features have been discussed.

Comparison of the Morphological Effect for the Simulation of Abnormal Goss Grain Growth in Two Fe-3%Si Alloys, Grades Hi-B and CGO

2004 ◽  
Vol 467-470 ◽  
pp. 887-892
Author(s):  
N. Maazi ◽  
N. Rouag ◽  
Richard Penelle
Keyword(s):  
Grain Growth ◽  
Boundary Migration ◽  
Orientation Imaging Microscopy ◽  
Grain Boundary Migration ◽  
Morphological Effect ◽  
Abnormal Growth ◽  
Orientation Imaging ◽  
Classical Simulation ◽  
Starting State ◽  
Simulation Based

A grain growth simulation based on the concept of grain boundary migration driven by the radius curvature has been tested to study the abnormal grain growth (AGG) of the Goss grains in silicon steels in presence of particles. In the classical simulation of AGG, the grain size is generally assumed to be homogeneous. In order to introduce the influence of the morphological and crystallographic heterogeneities on AGG around the Goss grain, the simulation procedure has been implemented using as starting state an experimental microstructure characterized by Orientation Imaging Microscopy (OIMTM). Abnormal growth results are compared for the two grades, Hi-B and CGO of Fe-3%Si alloys. It has been notably shown that the large grains resist AGG so that the Goss grain shape becomes anisotropic.

Analysis of WC Dissolution Phenomenon Happened in TIG Welded Joint of Cemented Carbide and Invar Alloy

2012 ◽  
Vol 184-185 ◽  
pp. 896-899 ◽  
Author(s):  
Pei Quan Xu ◽  
Ding Ma ◽  
Chun Wei Ma
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Welded Joint ◽  
Cemented Carbide ◽  
Invar Alloy ◽  
Scanning Method ◽  
Invar Alloys ◽  
Element Diffusion ◽  
Welded Seam ◽  
Shape Changes

In current research, WC dissolution phenomenon happened in TIG welds was investigated and discussed. And the element diffusion was studied using area-scanning method. The results showed that the WC dissolution phenomenon always happened near WC-Co/Welded seam interface. Moreover, the amount of WC dissolved in welds became less from WC-Co, welds to invar alloys. WC dissolution happened in welded seam induced by tungsten arc led to the WC grain growth (60µm or so) and WC shape changes. The grain boundary (GB) between different WC particles during WC aggregation was also confirmed and WC grain growth was owed to the WC aggregation during the processing of WC dissolution.

Observation of Grain Growth in Cu Films by In-Situ EBSD Analysis

2003 ◽  
Vol 766 ◽  
Author(s):  
D.P. Field ◽  
M.M. Nowell ◽  
O.V. Kononenko
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
Crystallographic Texture ◽  
Texture Evolution ◽  
Tantalum Nitride ◽  
Cu Films ◽  
Orientation Imaging ◽  
Film Characteristics ◽  
Beam Deposition

AbstractRecrystallization, grain growth and crystallographic texture evolution in Cu films is an area of importance for IC interconnect fabrication as the film characteristics influence the resulting line microstructure. This study examines Cu films deposited by partially ionized beam deposition onto a sublayer of tantalum nitride and additionally onto alpha- C:H. The films were annealed in-situ in the SEM chamber and intermittent orientation imaging was used to characterize the grain growth and crystallographic texture evolution in the films. Both initial and final textures are weak in each of the films analyzed, but are a function of sublayer material and thickness. Grain size in the Cu films is significantly smaller for the tantalum nitride sublayer than for the á-C:H sublayer.

The Evolution of Texture and Stored Energy during Recrystallization of IF High Strength Steel Investigated by Means of Orientation Imaging Microscopy

2007 ◽  
Vol 558-559 ◽  
pp. 241-246
Author(s):  
Kyoo Young Lee ◽  
Gyo Sung Kim ◽  
Kwang Geun Chin ◽  
Leo Kestens
Keyword(s):  
High Strength Steel ◽  
Texture Evolution ◽  
Orientation Imaging Microscopy ◽  
High Strength Steels ◽  
Annealing Treatment ◽  
High Strength ◽  
Stored Energy ◽  
Orientation Imaging ◽  
Cold Rolling And Annealing ◽  
The Difference

The evolution of texture and stored energy was studied for Ti bearing and Ti-Nb bearing IF high strength steel undergoing a double cold rolling and annealing treatment by using Orientation Imaging Microscopy. Ti bearing IF high strength steel showed a similar texture evolution of the α and γ fiber components to that of IF steel. On the contrary, Ti-Nb bearing IF high strength steel displayed a different texture evolution from the one observed in the former steels. The difference in texture and stored energy evolution between both high strength steels seemed to be affected by the segregation behavior of solute alloying elements such as P.

The Orientation Dependence of Strain Hardening and Texture Development in an Extruded Magnesium Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 363-368 ◽  
Author(s):  
D. Sarker ◽  
Dao Lun Chen
Keyword(s):  
Magnesium Alloy ◽  
Strain Hardening ◽  
Texture Evolution ◽  
Extrusion Direction ◽  
Orientation Dependence ◽  
Mechanical Anisotropy ◽  
Hardening Behavior ◽  
Compression Direction ◽  
Texture Change ◽  
Strain Hardening Behavior

Extruded magnesium alloys showed mechanical anisotropy due to the development of strong crystallographic textures during forming processes. In the present study the strain hardening behavior and texture evolution of an extruded AM30 magnesium alloy were studied in compression using cylindrical samples oriented at angles of 0°, 15°, 30°, 45° and 90° from the extrusion direction (ED). The yield strength decreased with increasing angle up to 45° and then increased at 90° from the ED, while the ultimate compressive strength exhibited a reverse trend. Both hardening capacity and fracture strain first increased from 0° to 45° and then decreased at 90° from the ED. The strain hardening behavior was directly related to the texture change and twinning, which played a key role in accommodating the compressive deformation, as the c-axes in most grains were observed to rotate always towards the anti-compression direction, irrespective of the sample orientation.

Sign in / Sign up

Export Citation Format

Share Document