What is the difference between DBT and Tg

[dmssrinivas]

Ductile to brittle transition temperature and Glass transition temperature. I know these two are different but don't know in what sense.

Does all the materials have both of these temperatures or only some or none? If only some or none, what property of material will allow it to have only one?

 

[dawin]

Did you try googling this before you asked your question? The first hit on wikipedia addresses this directly.

 

[dmssrinivas]

May be you are talking about amorphous materials have Tg and Crystalline materials have DBT, but that does not convince me because, some amorphous polymers have crystalline property too.

And what metallic glasses are?? Don't they have Glass transition temperature?