Oim 2005

Materials Characterization Labwww.mri.psu.edu/mcl

OIM/EBSD

Maria Klimkiewicz

[email protected]

865-3624

July 20, 2005


250 MRLAugust 179:45 AMParticle Characterization

114 MRI BldgAugust 249:45 AMX-ray photoelectron spectroscopy (XPS/ESCA)

114 MRI BldgAugust 2411:00 AMAuger Electron Spectroscopy (AES)

541 Deike Bldg.July 279:45 AMChemical analysis (ICP, ICP-MS)

541 Deike Bldg.August 109:45 AMSmall angle x-ray scattering (SAXS)

114 MRI Bldg August 39:45 AMAtomic Force Microscopy (AFM)

250MRL Bldg.July 209:45 AMOrientation imaging microscopy (OIM/EBSD)

114 MRI BldgJuly 1311:00 AMTEM sample preparation

114 MRI BldgJuly 139:45 AMFocused Ion Beam (FIB)

250 MRL Bldg.July 610:15 AMHigh temperature sintering lab (20 min lecture only)

250 MRL bldg.July 69:45 AMDielectric Characterization (25 min lecture only)

250 MRL Bldg.June 299:45 AMX-ray Diffraction (XRD)

541 Deike Bldg.June 2211:00 AMAnalytical SEM

541 Deike Bldg.June 229:45 AMScanning electron microscopy (SEM)

114 MRI BldgJune 159:45 AMTransmission Electron Microscopy (TEM/STEM)

250 MRL Bldg.June 89:45 AMThermal analysis (TGA, DTA, DSC)

LocationDateTimeTechniqueSummer Characterization Open HousesSummer Characterization Open Houses


BeaverStadium

Park Ave.

Park Ave.

Porter RoadPollock Road

University Drive

College Ave.

ShortlidgeR

oad North

Bur ro w

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oa d

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Centre Community

Hospital

E&ES Bldg:SEM

Hosler Bldg:SEM, ESEM, FE-SEM, EPMA, ICP, ICP-MS,BET, SAXS

MRI Bldg:XPS/ESCA, SIMS, TEM, HR-TEM, FE-Auger, AFM, XRD

Atherton Street

(322 Business)

MRL Bldg:SEM, XRD, OIM, DTA, DSC, TGA, FTIR, Raman, AFM, Powder, dielectric, prep, shop, IC, UV-Vis

Hastings Road

Penn StaterHotel

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Materials Characterization Lab LocationsBldg TelephoneMRL 863-7844MRI 865-0337Hosler 865-1981E&ES 863-4225

Route 322

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Steidle Bldg:Nanoindenter

Deike Bldg:


Outline

― Introduction to OIM/EBSD― OIM examples― how to get started ―OIM resources― a brief lab tour


Introduction to OIM/EBSD


OIM/EBSD and Hitachi S-3500N SEM


Schematic of OIM/EBSD


Bragg’s Law

Assumptions:Monochromatic beamParallel beam

http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/bragg.html


70°

Electron Backscatter Diffraction in the SEM (EBSD/OIM)


Electron Backscatter diffraction pattern

The crystal lattice symmetry is reflected in the pattern.

The width and intensity of the bands are directly related to the spacing of atoms in the crystal planes.

The angles between the bandsare directly related to the angles between planes in the crystal lattice


Introduction to OIM

.

“indexing” the pattern:

Locating the bands

Determine the angles between the bands

Comparing the angles to theoretical values

Determining the phase


112323

211

111

125 013

233323

121

251 141

152

011

031 152

114

125

Indexed EBSPIndexed EBSP

TSL/EDAX

An image processing algorithm (Hough Transform) is used to detect bands in the diffraction pattern. The pattern can be indexed by comparing the angles between the detected bands to the theoretical look-up-table. Indexing the pattern allows the crystallographic orientation to be determined


TSL/EDAX

As the beam is moved from grain to grain the electron backscatter diffraction pattern will change due to the change in the orientation of the crystal lattice in the diffracting volume.


OIM consists of two parts:

• Data Collection- “On Line”

• and Analysis-” Off Line”


Part one OIM :Data Collection

Interactive mode


Part one OIM :Data Collection

OIM scan:Automatic mode

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Part two OIM- Analysis Application

The stored data (location, orientation, image quality, confidence index, and phase) can be processed to create Orientation Imaging Micrographs


Orientation Map

Orientation map is generated by shading each point in the OIM scan according to some parameter reflecting the crystallographic rotation. The colors correspond to the crystal orientations as shown in the projection. Crystals with their 111 axis normal to the surface of the sample will be blue, and so on.


Image Quality Map

• Image Quality (IQ) map is created by analyzing the intensity of the Hough transform peaks for each point in a scan. The white areas indicate good crystallinity and high quality patterns. Dark areas represent areas of poor diffraction, which can be due to a number of factors such as defects, strain, overlapping/poor patterns at grain boundaries, oxidation, poor sample prep, etc.


Grain Boundary Map

• A Grain boundary Map can be generated by comparing the orientation between each pair of neighboring points in an OIM scan. A line is drawn separating a pair of points if the difference in orientation between the points exceeds a given tolerance angle.

TSL/EDAX


Maps, from left to right(1)Image Quality,(2) Boundaries defined as>10degree variation between points, (3) Boundaries defined as >1degree variation between points, (4) Boundaries defined as > 0.5degree variation between points

TSL/EDAX


OIM examples


Amy Stauffer Dept. of Material Science & Engineering

Multiphase identification


Powder containing crystals of : Hematite, Magnetite or Wuestite ?

Fe2O3(hematite)

Tsubasa Otake


Tsubasa Otake

Hematite, Magnetite or Wuestite ?

FeO (wuestite)


Tsubasa Otake

Hematite, Magnetite or Wuestite ?

No magnetite


Multiphase identificationTitanium (Alpha) and Titanium (Beta)

Amy Stauffer


Phase color map and phase fractionTitanium (Alpha) and Titanium (Beta)

Amy Stauffer


Grain size and misorientation angle plots and charts

Titanium (Alpha) and Titanium (Beta)Amy Stauffer


Grain size:Titanium (Alpha) and Titanium (Beta)


Average Grain Size (by Area) = 1.75 µm

RD

TDND

Random oriented PMN-32.5 PT, K. Brosnan Dept. of Materials Science & Engineering


(Na1/2Bi1/2)TiO3-BaTiO3 (NBT-BT), is a lead free candidate ceramic for a piezoelectric material. The dielectric constant and piezoelectric constant increase as the degree of texture in the ceramic increases.

H. Yilmaz


Example of texture


Strontium Titanium Oxide single crystalH. Yilmaz


OIM used for identification of alpha-alumina crystal morphology produced under glycothermal conditions.

OIM for Single Crystal Identification

R. Kumar MRI


Homoepitaxial growth on 6-H SiC single crystal, A. Badzian MRI


• Mechanical polishing

• Electropolishing

• Chemical etching

• Ion etching

• Conductive Coating

Sample preparation


Get Started

Contact: Maria Klimkiewicz

1. SEM training2. Sample preparation3. OIM training


OIM resources

• OIM users manual• Electron Backscatter Diffraction in Materials Science-

book edited by A. J. Schwartz M. Kumar and B. L. Adams

• http://www.edax.com/

Oim 2005

Business

Transcript of Oim 2005