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Branching of {110) twin boundaries in five-layered Ni-Mn-Ga bent single crystals
Two bending tests around two perpendicular axes were applied to 10M Ni-Mn-Ga single crystals with fivelayeredmodulated structure. The crystal structure and microstructure evolution were examined using synchrotronradiation and electron backscatter diffraction, respectively. The bend stress results in pseudoelasto-plasticstrain due to {101) twins tapering. A close examination of the microstructure reveals an additional pattern indicatingmicrostructural changes in the form of {110) twins. As bending proceeds the {110) twins branch undergoinga significant twin refinement. Additionally, an elastic change of lattice parameters is confirmed yielding ahigher total pseudoelastic strain. Unloading restores the initial twin configuration removing a large amount ofthe {110) twin boundaries, however, this process is followed by incomplete recovery since the samples do notretain its original shape entirely. The paper underlines the differences inmechanismfor bending around two perpendicularaxes explaining the amount of strain observed under pseudoelastic deformation. Additionally, the resultsare discussed with respect to minimization of elastic energy due to twin refinement and branching aswell asmobility of the {101) and {110) twin boundaries.
Branching of {110) twin boundaries in five-layered Ni-Mn-Ga bent single crystals
Two bending tests around two perpendicular axes were applied to 10M Ni-Mn-Ga single crystals with fivelayeredmodulated structure. The crystal structure and microstructure evolution were examined using synchrotronradiation and electron backscatter diffraction, respectively. The bend stress results in pseudoelasto-plasticstrain due to {101) twins tapering. A close examination of the microstructure reveals an additional pattern indicatingmicrostructural changes in the form of {110) twins. As bending proceeds the {110) twins branch undergoinga significant twin refinement. Additionally, an elastic change of lattice parameters is confirmed yielding ahigher total pseudoelastic strain. Unloading restores the initial twin configuration removing a large amount ofthe {110) twin boundaries, however, this process is followed by incomplete recovery since the samples do notretain its original shape entirely. The paper underlines the differences inmechanismfor bending around two perpendicularaxes explaining the amount of strain observed under pseudoelastic deformation. Additionally, the resultsare discussed with respect to minimization of elastic energy due to twin refinement and branching aswell asmobility of the {101) and {110) twin boundaries.
Branching of {110) twin boundaries in five-layered Ni-Mn-Ga bent single crystals
Chulist, R. (author) / Straka, L. (author) / Seiner, H. (author) / Sozinov, A. (author) / Schell, N. (author) / Tokarski, Tomasz (author)
2019-01-01
107703 pages
Materials and design 171, 107703 (2019). doi:10.1016/j.matdes.2019.107703
Miscellaneous
Electronic Resource
English
Branching of {110) twin boundaries in five-layered Ni-Mn-Ga bent single crystals
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