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Delville, Rémi; Schryvers, Dominique; Zhang, Zhiyong; James, Richard D.
Scripta materialia, 03/2009, Letnik: 60, Številka: 5Journal Article
A sharp drop in hysteresis is observed for shape memory alloys satisfying the compatibility condition between austenite and martensite, i.e. λ 2 = 1, where λ 2 is the middle eigenvalue of the transformation strain matrix. The present work investigates the evolution of microstructure by transmission electron microscopy as the composition of the Ti 50Ni 50− x Pd x system is systemically tuned to achieve the condition λ 2 = 1. Changes in morphology, twinning density and twinning modes are reported along with twinless martensite and exact austenite–martensite interfaces.
