Questions
1. What is the difference between bulk or macrotexture and
microtexture?
2. What are the parameters that are used to describe micro texture
and macro texture?
3. What is the principle of pole figure measurement?
4. How can one ascertain to bring most of the crystals of a
polycrystal so that each one takes part in diffraction?
5. Can you determine bulk texture from microtexture
measurements?
Questions
1.
Microtexture is mainly measured by
(a) X-ray diffraction;
(b) Neutron diffraction;
(c) Electron back scatter diffraction;
(d) Optical microscopy.
2. Bulk texture can be measured by
(a) Transmission electron microscopy;
(c) Neutron diffraction;
(b) X-ray diffraction
(d) Optical microscopy
3. Which of the following has the highest depth of penetration.
(a) X-ray; (b) Neutron
(c) Electron;
(d) All are equal.
4. The sample is subjected to different tilts during X-ray measurement of texture for
(a) bringing all the grains in diffraction condition
(b) increasing the statistics of measurent
(c) to impose the sample reference direction on the pole figure
(d) none of the above
5.
(a)
(b)
(c)
(d)
Which of the following statements are true.
X-ray diffraction provides better spatial resolution and statistics
X-ray diffraction provides better statistics, but poor spatial resolution.
EBSD provides better spatial resolution and statistics
EBSD provides better spatial resolution, but poor statistics
1.
2.
Questions
If you are given two identical looking samples of a metallic material, how will
you decide whether this is a single crystal or a polycrystal? If you are given a
single crystal and unable to get a particular diffraction pattern, what will you do
to locate the same.
In the measurement complete (111) pole figure, if the data is recorded at 5
intervals in both  and  angles, how many times the (111) peaks are recorded?
3. Describe the role of all the axes in a five axis goniometer as used in Schulz
reflection geometry.
4. Can you measure the (111) pole figure for a steel samples? If yes, which peak will
be fixed for measurement of texture?
5. In the Schulz reflection method, which of the following is correct:
(a) the tilt angle  enables most of the grains to come under diffraction condition
(b) the rotation angle  enables most of the grains to come under diffraction
condition
(c) the tilt angle  brings the diffraction vector coincident with the specimen axes
alternately
(d) the rotation angle  brings the diffraction vector coincident with the specimen
axes alternately
Questions
(1) What can be directly measured by experiment:
(a) inverse pole figure
(b) orientation distribution function
(c) pole figure
(d) all the above
(2) In the Schulz reflection method, which of the following is correct:
(a) the tilt angle  enables most of the grains to come under diffraction
condition
(b) the rotation angle  enables most of the grains to come under
diffraction condition
(c) the tilt angle  brings the diffraction vector coincident with the
specimen axes
alternately
(d) the rotation angle  brings the diffraction vector coincident with the
specimen axes
alternately
(3) Which of these are the limitations of pole figures:
(a) specific (hkl) planes can not be plotted
(b)poles in the final plot for a polycrystalline material are not identified
with particular
crystals
(c) information about the crystallite location in a sample is absent
(d) the orientation of a crystal must be described relative to another
Questions
1. What are Kikuchi Patterns? How it helps in identifying the
microstructure constituents?
2. Under what conditions Kikuchi patterns form?
3. What are Kikuchi Patterns? How it helps in identifying the
orientation?
Question
1. What should be the experimental precautions should be taken
during EBSD?
2. Explain the tilting of sample in EBSD experiment.
3. What is Hough space?
4. Explain the orientation determination from Kikuchi pattern.
5. How does capturing angle affect in identifying microstructure
constituents?
Questions
1. Which of the following is NOT possible to get determined by EBSD?
(a) Grain size
(b) Texture
(c) Burger’s vector of dislocations
(d) Mapping of strained regions of the microstructure.
2. How are the grains revealed in EBSD analysis?
3. How do you determine the nature of grain boundaries using EBSD?
4. Pattern quality maps does not get affected by
(a) local crystalline perfection,
(b) surface contamination
(c) the phase and orientation
(d) atomic number