Kedharnath Arumugakani

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Questions related from Kedharnath Arumugakani

Why MD simulation of mechanical loading (ex. tensile) in metallic systems gives stress values in GPa (high stress value) ?

During MD tensile simulation, the stress values rise upto some GPa (high stress value). I think it is because of the following reasons: 1. System is almost defect free or only with few defects...

08 August 2018 9,562 12 View

Why <110> dumbbell in bcc iron has the lowest energy configuration ?

In non magnetic materials, is the lowest energy configuration and not SIA dumbbell. But, in bcc Iron dumbbell is the lowest energy configuration. What makes...

08 August 2018 5,198 3 View

How is diffusion coefficient from MSD values obtained from LAMMPS is calculated ?

I'm interested in calculating the diffusion coefficient of self interstitial atom in iron system at 800 K. I got a plot like (attached) this 'MSD vs time' using LAMMPS. The slope (diffusion...

09 September 2017 1,782 24 View

Why is the Ductile Brittle Transition Temperature of many metals (like silver) are not available ?

Why is the Ductile Brittle Transition Temperature of many metals are not available ? I was trying to find the DBTT data for silver and was shocked to know the lack of these data.

01 January 1970 6,473 1 View

Can any amorphous material be made into single crystal or into a crystalline form?

Amorphous crystal

01 January 1970 742 26 View

What potential should be used for iron for studying dislocation crack grain boundaries interaction using molecular dynamics simulation ?

There are many potentials for Fe BCC. But, What potential should be used for BCC iron for studying dislocation - crack - grain boundaries interaction using molecular dynamics simulation ?

01 January 1970 3,544 6 View

Why Symmetric tilt grain boundaries in atomistic simulations ?

In most of the atomistic simulations, symmetric (asymmetric) tilt grain boundaries are studied. Is there any relationship with the GBs in the real world.

01 January 1970 7,649 6 View

What is the Relation between Grain Boundary and grains crystallography ?

what does it mean - "Fe sigma 3" symmetric tilt grain boundary ? I know about sigma. What is the plane and direction of the two grains and grain boundary ?

01 January 1970 6,050 7 View

Out of several space groups and point groups in crystallography how we end up in 7 crystal structures and 14 bravais lattices?

Which symmetry operator is a must to all crystal structures and bravais lattices?

01 January 1970 4,195 1 View

How do cerium and magnesium addition help to convert Grey cast iron into speroidal grey cast iron during heat treatment?

Cerium and Magnesium addition are done duirng casting in GCI so that after heat treatment GCI is converted to SGI. How Mg and Ce are contributing to this change?

01 January 1970 5,270 10 View

In martensitic transformation in steel, why should we consider BCT by joining the face centered atoms of FCC even though FCC has higher symmetry?

FCC has 3 fold symmetry but BCT doesn't. So why should we draw a BCT inside a FCC and name it as martensite. A reverse can also be done where we can draw BCT and they get a FCC out of it. If so in...

01 January 1970 9,807 13 View

How is the offset yield strength of Cu or Al measured from the stress-strain curve?

For metals like steel we a draw a line parallel to stress-strain curve at 0.2% strain. But in metals like copper the stress strain curve within the elastic limit is not linear and is merely...

01 January 1970 4,837 2 View

Martensitic transformation is considered as diffusionless shear transformation. How is shear involved in this transformation?

Diffusionless implies atoms have not moved. Then how come shear in this transformation of steel?

01 January 1970 885 3 View