Revealing the interface structure of {111} type I twin in Ti-Ni-Hf shape memory alloy composite

doi:10.1016/j.jmst.2021.07.033

J. Mater. Sci. Technol. ›› 2022, Vol. 105: 237-241.DOI: 10.1016/j.jmst.2021.07.033

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Revealing the interface structure of {111} type I twin in Ti-Ni-Hf shape memory alloy composite

Xiaoyang Yi^a^,^b,1, Bin Sun^a,1, Kuishan Sun^a, Haizhen Wang^b, Shangzhou Zhang^b, Zhiyong Gao^a, Xianglong Meng^a^,^*()

^aSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
^bCollege of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai, 264005, China

Revised:2021-07-07 Published:2022-04-10 Online:2022-04-20
Contact: Xianglong Meng
About author:^*E-mail address: xlmeng@hit.edu.cn (X. Meng)
First author contact:¹The authors equally contributions to this work.

Abstract

Abstract:

In the present study, the interface of martensite twins in Ti-Ni-Hf shape memory alloy composite was studied by high resolution transmission electron microscopy in terms of atomic structure. The results reveal that two varieties of interface structure for {111} type I twins are observed, which is determined by the interior substructure (001) compounds twin. The formation of {111} type I twins can be attributed to the interaction between the misfit dislocations on (001) plane and ($\bar{1}11$) twin boundary. In addition, the corresponding characteristic parameters of misfit dislocation were calculated in theory. The theoretical value of disregistry factor and average spacing for the misfit dislocations are well in good agreement with the experimental results.

Key words: Ti-Ni-Hf alloy, Shape memory alloy composite, Interface structure, Martensite variant, {111} Type I twins

Xiaoyang Yi, Bin Sun, Kuishan Sun, Haizhen Wang, Shangzhou Zhang, Zhiyong Gao, Xianglong Meng. Revealing the interface structure of {111} type I twin in Ti-Ni-Hf shape memory alloy composite[J]. J. Mater. Sci. Technol., 2022, 105: 237-241.

Figures/Tables 4

Fig. 1. Crystal structure parameters of B19ˊ martensite in Ti-Ni-Hf alloy (a) A monoclinic unit cell of B19ˊ martensite. The lattice plane ($\bar{1}20$) is approximately normal (96o) to direction [$\bar{1}10$]; (b) Lattice vector lying in ($\bar{1}20$); (c) Vectors lying in ($\bar{3.4315} 6.7520 1$); (d) and (e) bright field TEM image and corresponding SAED pattern

Fig. 2. HRTEM image of I-IV interface in Ti-Ni-Hf composite (a) and the corresponding illustration showing the interface (b).

Fig. 3. Interfacial characteristics of I-III (a) and II-IV (b) interface in Ti-Ni-Hf based composite

Fig. 4. Diagrammatic sketch showing the formation of II-III interface (a); II-IV interface (b); (c) the illustration showing interface structure characteristics of {111} type I twins in Ti-Ni-Hf composites

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Revealing the interface structure of {111} type I twin in Ti-Ni-Hf shape memory alloy composite

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