Hysteresis effect on austenite-martensite interface in Ni-Mn-Ga single crystal

Chengguan Zhang, Guoshun Qin, Shaobin Zhang, Xue Chen, Yongjun He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The experiments on Ni-Mn-Ga single crystal shape memory alloy under a heating-cooling cycle demonstrate that the automatically generated twin laminate structure of the compatible austenite-martensite interface in the forward martensitic phase transition is significantly different from that in the reverse phase transition, even though the temperature hysteresis is small (As - Ms around 4 ◦C). Moreover, after the cooling-induced austenite → martensite transition, the remaining twin laminate is so fine (layer width around 1 μm) that the neighbouring twin boundaries merge with each other and disappear, making the fine twin laminate evolve into a single martensite variant (i.e., spontaneous detwinning). These observations provide insights into the relation between
the hysteresis (phase-transition driving forces), austenite-martensite interface, and the basic material parameters such as twin boundary energy and softening modulus during the phase transition.
Original languageEnglish
Article number115029
Number of pages6
JournalScripta Materialia
Volume222
Issue number1
Early online date13 Sep 2022
DOIs
Publication statusE-pub ahead of print - 13 Sep 2022

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