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Effect of phason strain on the transition of an octagonal quasicrystal to a β -Mn-type structure

1989; American Physical Society; Volume: 40; Issue: 18 Linguagem: Inglês

10.1103/physrevb.40.12183

1095-3795

Z. H., Lu Xu, Ning Wang, K. H. Kuo, Zhangziyi Jin, Guoyan Cheng,

Microstructure and mechanical properties

The process of transition from an octagonal quasicrystal to a crystal with \ensuremath{\beta}-Mn-type structure in Cr-Ni-Si alloy was investigated theoretically and experimentally. Using the linear phason strain field theory, the computer simulation of the diffraction patterns described the process of transition. The results of electron-diffraction experiments confirmed the correctness of the theoretical ones. The real-space tilings were also given. From the point of view of the geometric structural description, they also show the transition from octagonal quasiperiodicity to periodicity in a \ensuremath{\beta}-Mn-type structure. The transition involves the nucleation of regions of local translational periodicity in the original quasicrystal.