Taming martensitic transformation via concentration modulation at nanoscale

Dissecting the Mechanism of Martensitic Transformation via Atomic-Scale Observations

Martensitic transformation plays a pivotal role in the microstructural evolution and plasticity of many engineering materials. However, so far the underlying atomic processes that accomplish the displacive transformation have been obscured by the difficulty in directly observing key microstructural signatures on atomic scale. To resolve this long-standing problem, here we examine an AISI 304 au...

Martensitic Transformation and Elastic Constants

Driving force for martensitic transformation in steels

recently determined LVl~ to be 111918 J mol-I at temperatures below 1000 K, and pointed out that their experimental data were free from various 'intercept effects' which had dogged earlier investigations. Similarly, for T<1000K, they deduced '\~s=51.44Jmol-IK-I. There seem to be no data on the variation of LVl~ or ,\~s as a function of x. However, Lobo and Geigerl found that LVll: and ,\S~S do ...

Inverse Martensitic Transformation in Zr Nanowires

Suzhi Li,1 Xiangdong Ding,1,2,*,† Ju Li,1,3,*,‡ Xiaobing Ren,1,4 Jun Sun,1 Evan Ma,1,5,*,§ and Turab Lookman2 1State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China 2Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 3Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia,...

Complexion-mediated martensitic phase transformation in Titanium

The most efficient way to tune microstructures and mechanical properties of metallic alloys lies in designing and using athermal phase transformations. Examples are shape memory alloys and high strength steels, which together stand for 1,500 million tons annual production. In these materials, martensite formation and mechanical twinning are tuned via composition adjustment for realizing complex...