Dear Mr Koyama,

I guess, you mean the interfacial energy of coherent gamma-Austenite/epsilon-martensite interfaces, i.e. with  (111)/(0001) habit planes, that are part of the thermodynamic description of epsilon-martensite according to Olson and Cohen (1976/1986) . I am strongly convinced that it is in the range 1 mJ/m2 or even lower. The problem is that actually interfacial energies do not exist in the way as it is described by Olson and Cohen, because roughly speeking this description accounts for the gamma/epsilon interfacial energy of an intrinsic stacking fault twice. The most important value for the desciption of intrinsic stacking faults as well as epsilon-martensite is Delta G (gamma-epsilon).

I kindly invite you to download (free author copy) our publication on this purpose under:

http://www.tandfonline.com/eprint/28bwsbWJsXkZNaxRx7Y9/full

With best regards

David Geißler

Dear Mr Geissler

Thank you for the clear answer. In fact the interfacial energy has been an important issue to thermodynamically calculate stacking fault energy. But the value is set as fitting parameter in most cases. Your answer and work are more theoretical and convincing. I greatly appreciate you.

Motomichi

Control enhance temperature then fast quench .determine heat treatment temperature define thin film or bulk  material defined and experiment.

control impurity specially activation and sizes ingredient