An atomistic perspective of martensite twinning in Iron

TL;DR

This paper uses molecular dynamics simulations to reveal the atomistic mechanisms of martensite nucleation and twinning in iron, emphasizing the role of the fcc/bcc interface in initiating atomic shear and twin formation.

Contribution

It provides the first detailed atomistic insight into martensite twinning mechanisms, linking interface behavior to twin morphology development in steels.

Findings

Atomic displacements originate at the fcc/bcc interface.

Interface facilitates initial atomic shear during transformation.

Stress-induced nucleation leads to twin morphology formation.

Abstract

The martensitic transformation is one of the most important phenomena in metals science due to its essential contribution to the strength of steels and most engineering alloys. Yet the basic, atomistic mechanisms leading to martensite nucleation and twin morphology are not yet known. A detailed picture in this regard is required if the strengthening effects of martensite are to be properly understood. This work presents molecular dynamics (MD) simulations of the martensitic transformation using a model fcc/bcc semi-coherent interface with Nishiyama-Wasserman orientation relationship. Significant insight into this important phenomenon is detailed in this work which shows that the atomic displacements that cause nucleation and twin morphology formation of the martensitic phase originate at the fcc/bcc interface. The interface facilitates the initial atomic shear during the transformation which in turn causes the stress-induced homogeneous nucleation and twin morphology formation. The understanding of the atomistic processes leading to the twin morphology formation will allow the control of the twinning process for further enhancement of mechanical properties.