Ehsan Ghassemali

8 Questions 51 Answers 0 Followers

Questions related from Ehsan Ghassemali

Plasma FIB (PFIB) using Xe: Anybody has experience in making TEM lamella with PFIB?

Normally we believe Xe ions must be more detrimental to the specimen's surface compare to Ga ions, since they are heavier and larger. So personally I would not consider PFIB method suitable for...

10 October 2015 3,684 1 View

How precise is calculation of GNDs density using EBSD?

Using EBSD, and based on the local average misorientation, it is possible to calculate the density of Geometrically Necessary Dislocations (GNDs). But there is a huge debate on the accuracy of...

09 September 2015 7,536 14 View

EBSD/EDS/WDS: which company you go with... EDAX, OXFORD, or BRUKER?

Let's say you want to get a new FIB/SEM with the capability of 3D EBSD and EDS analysis in a fast way with a proper resolution. Which detectors you choose to be user friendly (when it comes to the...

01 January 2015 9,144 3 View

Do you have any reference/guideline for sample preparation procedure for 3D EBSD analysis in different FIB/SEM systems?

I have seen some systems, such as FEI requires a particular sample preparation (rectangular thin samples with 90 degree edges). Their configurations can only do 3D EBSD on the edge of the...

01 January 2015 1,702 3 View

What is the standard method for beam/source alignment in SEM (JSM7001F)?

To get a very precise EBSD analysis, I need to have a perfect adjustments in the SEM to be able to detect small objects in high magnifications. For that a very good Beam/Source alignment is...

10 October 2014 3,918 5 View

In EBSD, how can we index Cementite lamellae (0.1-0.3 um width) in a pearlitic structure?

In literature it has been commonly reported that it is rather difficult to index cementite lamellae due to their low structure factors of its lattice. But I am interested to monitor LAGBs in a...

10 October 2014 5,758 16 View

Is it possible to measure (or compare) the bonding coherency of the second phase/particle in a metal matrix using EBSD? GNDs measurement can help?

Second phase/particles can have coherent/semi-coherent/non-coherent bonding with the metal matrix. Is there a way to have a feeling about the second phase coherency using EBSD? Can KAM analysis...

09 September 2014 4,970 2 View

Is it possible to observe the austenite grain boundaries in a cast iron without doing DAAS treatment?

To observe the austenite grain boundaries before eutectic transformation, we usually need to do DAAS treatment. Is that possible to see the austenite grain boundaries using EBSD, without DAAS...

05 May 2014 5,605 2 View