Morphology and Crystallography of Martensite Plate with Long Period Stacking Structure in Ti-Pd Shape Memory Alloy

作者：Matsuda Mitsuhiro^*; Yano Shoichiro; Nishida Minoru

来源：Materials Transactions, 2011, 52(11): 2016-2021.

DOI：10.2320/matertrans.M2011187

• titanium-palladium alloy
• martensitic transformation
• 18R martensite
• variant accommodation twin
• transmission electron microscopy

The morphology and crystallography of martensite plates with a long period stacking structure in Ti-Pd shape memory alloy were investigated by transmission electron microscopy. In addition to B19(2H) martensite, an 18R(2 (1) over bar)(6) structure was observed in equiatomic Ti-Pd alloy quenched above 1373 K. Three fundamental plate variant combinations were identified in the plate group in the region consisting exclusively of 18R martensite. These were designated A : B, A : C and A : D types, and their morphologies and crystallographic characteristics are a wedge with type II, a spear with type I and a fork with compound twin relations, respectively. Duplex martensitic phases coexisting in the same area, namely, "two-in-one" structures, were also observed. [doi:10.2320/matertrans.M2011187]

• 出版日期2011-11