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Shi, Hui
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document
Special microstructures and twin features in Ti50Ni 50-X(Pd,Au)X at small hysteresis
Abstract
<p>The breaking of symmetry due to atomic displacements in the austenite-martensite phase transformation generally leads to their crystallographic incompatibility. Energy minimizing accommodation mechanisms such as martensite twinning have been recently shown to be a source of hysteresis and irreversible plastic deformation. Compatibility between the two phases can however be achieved by carefully tuning lattice parameters through composition change. A dramatic drop in hysteresis and novel microstructures such as a lowering of the amount of twin lamella are then observed. Related theoretical and simulation works also support the existence of such microstructures including peculiar self-accommodating configurations at near-compatibility. We present the transmission electron microscopy (TEM) study of these novel microstructures for the alloy systems Ti<sub>50</sub>Ni <sub>50-x</sub>Pd<sub>x</sub> and Ti<sub>50</sub>Ni<sub>50-x</sub>Au<sub>x</sub> where the composition was systemically tuned to approach perfect compatibility. High resolution imaging of the interface between austenite and martensite supplies evidences of compatibility at the atomic level.</p>